Monthly Notices of the Royal Astronomical Society最新文献_第7页

GA-NIFS: NIRSpec reveals evidence for non-circular motions and AGN feedback in GN20 GA-NIFS：近红外探测器揭示了GN20非圆运动和AGN反馈的证据

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-11 DOI: 10.1093/mnras/stae1993

Hannah Übler, Francesco D’Eugenio, Michele Perna, Santiago Arribas, Gareth C Jones, Andrew J Bunker, Stefano Carniani, Stéphane Charlot, Roberto Maiolino, Bruno Rodríguez del Pino, Chris J Willott, Torsten Böker, Giovanni Cresci, Nimisha Kumari, Isabella Lamperti, Eleonora Parlanti, Jan Scholtz, Giacomo Venturi

{"title":"GA-NIFS: NIRSpec reveals evidence for non-circular motions and AGN feedback in GN20","authors":"Hannah Übler, Francesco D’Eugenio, Michele Perna, Santiago Arribas, Gareth C Jones, Andrew J Bunker, Stefano Carniani, Stéphane Charlot, Roberto Maiolino, Bruno Rodríguez del Pino, Chris J Willott, Torsten Böker, Giovanni Cresci, Nimisha Kumari, Isabella Lamperti, Eleonora Parlanti, Jan Scholtz, Giacomo Venturi","doi":"10.1093/mnras/stae1993","DOIUrl":"https://doi.org/10.1093/mnras/stae1993","url":null,"abstract":"We present rest-frame optical data of the $zsim 4$ submillimetre galaxy GN20 obtained with the JWST Near Infrared Spectrograph (NIRSpec) in integral field spectroscopy mode. The H$alpha$ emission is asymmetric and clumpy and extends over a projected distance of &gt;15 kpc. To first order, the large-scale ionized gas kinematics are consistent with a turbulent ($sigma sim 90$ km s$^{-1}$), rotating disc ($v_{rm rot}sim 500$ km s$^{-1}$), congruent with previous studies of its molecular and ionized gas kinematics. However, we also find clear evidence for non-circular motions in the H$alpha$ kinematics. We discuss their possible connection with various scenarios, such as external perturbations, accretion, or radial flows. In the centre of GN20, we find broad-line emission (full width at half-maximum $sim 1000{-}2000$ km s$^{-1}$) in the H$alpha$ + [N ii] complex, suggestive of fast, active galactic nucleus-driven winds or, alternatively, of the broad-line region of an active black hole. Elevated values of [N ii] $lambda 6583$/H$alpha gt 0.4$ and of the Hα equivalent width EW(H$alpha) gt 6$ Å throughout large parts of GN20 suggest that feedback from the active black hole is able to photoionize the interstellar medium. Our data corroborate that GN20 offers a unique opportunity to observe key processes in the evolution of the most massive present-day galaxies acting in concert, over 12 billion years ago.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"169 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Isotopic abundance of carbon in the DLA towards QSO B1331+170 向 QSO B1331+170 的 DLA 中碳的同位素丰度

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-11 DOI: 10.1093/mnras/stae2056

Dinko Milaković, John K Webb, Paolo Molaro, Chung-Chi Lee, Prashin Jethwa, Guido Cupani, Michael T Murphy, Louise Welsh, Valentina D’Odorico, Stefano Cristiani, Ricardo Génova Santos, Carlos J A P Martins, Nelson J Nunes, Tobias M Schmidt, Francesco A Pepe, Maria Rosa Zapatero Osorio, Yann Alibert, J I González Hernández, Paolo Di Marcantonio, Enric Palle, Rafael Rebolo, Nuno C Santos, Sérgio G Sousa, Alejandro Suárez Mascareño

{"title":"Isotopic abundance of carbon in the DLA towards QSO B1331+170","authors":"Dinko Milaković, John K Webb, Paolo Molaro, Chung-Chi Lee, Prashin Jethwa, Guido Cupani, Michael T Murphy, Louise Welsh, Valentina D’Odorico, Stefano Cristiani, Ricardo Génova Santos, Carlos J A P Martins, Nelson J Nunes, Tobias M Schmidt, Francesco A Pepe, Maria Rosa Zapatero Osorio, Yann Alibert, J I González Hernández, Paolo Di Marcantonio, Enric Palle, Rafael Rebolo, Nuno C Santos, Sérgio G Sousa, Alejandro Suárez Mascareño","doi":"10.1093/mnras/stae2056","DOIUrl":"https://doi.org/10.1093/mnras/stae2056","url":null,"abstract":"Chemical evolution models predict a gradual build-up of 13C in the Universe, based on empirical nuclear reaction rates and assumptions on the properties of stellar populations. However, old metal-poor stars within the Galaxy contain more 13C than is predicted, suggesting that further refinements to the models are necessary. Gas at high-redshift provides important supplementary information at metallicities $-2lesssim left[{rm Fe/H}right]lesssim -1$, for which there are only a few measurements in the Galaxy. We obtained new, high-quality, VLT/ESPRESSO observations of the QSO B1331$+$170 and used them to measure 12C/13C in the damped Lyman-$alpha$ system (DLA) at $z_{rm abs}=1.776$, with $left[{rm Fe/H}right]$ = −1.27. ai-vpfit, an artificial intelligence tool based on genetic algorithms and guided by a spectroscopic information criterion, was used to explore different possible kinematic structures of the carbon gas. Three hundred independent ai-vpfit models of the absorption system were produced using pre-set 12C/13C values, ranging from 4 to 500. Our results show that ${rm ^{12}C / ^{13}C}=28.5^{+51.5}_{-10.4}$, suggesting a possibility of 13C production at low metallicity.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"173 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142256164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rocking the BOAT: the ups and downs of the long-term radio light curve for GRB 221009A 摇摆的 BOAT：GRB 221009A 长期射电光曲线的起伏变化

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-11 DOI: 10.1093/mnras/stae2050

L Rhodes, A J van der Horst, J S Bright, J K Leung, G E Anderson, R Fender, J F Agüí Fernandez, M Bremer, P Chandra, D Dobie, W Farah, S Giarratana, K Gourdji, D A Green, E Lenc, M J Michałowski, T Murphy, A J Nayana, A W Pollak, A Rowlinson, F Schussler, A Siemion, R L C Starling, P Scott, C C Thöne, D Titterington, A de Ugarte Postigo

{"title":"Rocking the BOAT: the ups and downs of the long-term radio light curve for GRB 221009A","authors":"L Rhodes, A J van der Horst, J S Bright, J K Leung, G E Anderson, R Fender, J F Agüí Fernandez, M Bremer, P Chandra, D Dobie, W Farah, S Giarratana, K Gourdji, D A Green, E Lenc, M J Michałowski, T Murphy, A J Nayana, A W Pollak, A Rowlinson, F Schussler, A Siemion, R L C Starling, P Scott, C C Thöne, D Titterington, A de Ugarte Postigo","doi":"10.1093/mnras/stae2050","DOIUrl":"https://doi.org/10.1093/mnras/stae2050","url":null,"abstract":"We present radio observations of the long-duration gamma-ray burst (GRB) 221009A which has become known to the community as the Brightest Of All Time or the BOAT. Our observations span the first 475 days post-burst and three orders of magnitude in observing frequency, from 0.15 to 230 GHz. By combining our new observations with those available in the literature, we have the most detailed radio data set in terms of cadence and spectral coverage of any GRB to date, which we use to explore the spectral and temporal evolution of the afterglow. By testing a series of phenomenological models, we find that three separate synchrotron components best explain the afterglow. The high temporal and spectral resolution allows us to conclude that standard analytical afterglow models are unable to explain the observed evolution of GRB 221009A. We explore where the discrepancies between the observations and the models are most significant and place our findings in the context of the most well-studied GRB radio afterglows to date. Our observations are best explained by three synchrotron emitting regions which we interpret as a forward shock, a reverse shock and an additional shock potentially from a cocoon or wider outflow. Finally, we find that our observations do not show any evidence of any late-time spectral or temporal changes that could result from a jet break but note that any lateral structure could significantly affect a jet break signature.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"108 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photospheric signatures of CME onset CME 开始时的光层特征

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-10 DOI: 10.1093/mnras/stae2110

O P M Aslam, D MacTaggart, T Williams, L Fletcher, P Romano

引用次数: 0

Impact of extragalactic point sources on the low-frequency sky spectrum and cosmic dawn global 21-cm measurements 银河系外点源对低频天空光谱和宇宙曙光全球 21 厘米测量的影响

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-10 DOI: 10.1093/mnras/stae2111

Shikhar Mittal, Girish Kulkarni, Dominic Anstey, Eloy de Lera Acedo

{"title":"Impact of extragalactic point sources on the low-frequency sky spectrum and cosmic dawn global 21-cm measurements","authors":"Shikhar Mittal, Girish Kulkarni, Dominic Anstey, Eloy de Lera Acedo","doi":"10.1093/mnras/stae2111","DOIUrl":"https://doi.org/10.1093/mnras/stae2111","url":null,"abstract":"Contribution of resolved and unresolved extragalactic point sources to the low-frequency sky spectrum is a potentially non-negligible part of the astrophysical foregrounds for cosmic dawn 21-cm experiments. The clustering of such point sources on the sky, combined with the frequency-dependence of the antenna beam, can also make this contribution chromatic. By combining low-frequency measurements of the luminosity function and the angular correlation function of extragalactic point sources, we develop a model for the contribution of these sources to the low-frequency sky spectrum. Using this model, we find that the contribution of sources with flux density &gt;10−6 Jy to the sky-averaged spectrum is smooth and of the order of a few kelvins at 50–200 MHz. We combine this model with measurements of the galactic foreground spectrum and weigh the resultant sky by the beam directivity of the conical log-spiral antenna planned as part of the Radio Experiment for the Analysis of Cosmic Hydrogen (REACH) project. We find that the contribution of point sources to the resultant spectrum is $sim 0.4%$ of the total foregrounds, but still larger by at least an order of magnitude than the standard predictions for the cosmological 21-cm signal. As a result, not accounting for the point-source contribution leads to a systematic bias in 21-cm signal recovery. We show, however, that in the REACH case, this reconstruction bias can be removed by modelling the point-source contribution as a power law with a running spectral index. We make our code publicly available as a Python package labelled epspy.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"43 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The HYENAS project: a prediction for the X-ray undetected galaxy groups HYENAS项目：对未探测到的X射线星系群的预测

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-10 DOI: 10.1093/mnras/stae2115

Weiguang Cui, Fred Jennings, Romeel Dave, Arif Babul, Ghassem Gozaliasl

{"title":"The HYENAS project: a prediction for the X-ray undetected galaxy groups","authors":"Weiguang Cui, Fred Jennings, Romeel Dave, Arif Babul, Ghassem Gozaliasl","doi":"10.1093/mnras/stae2115","DOIUrl":"https://doi.org/10.1093/mnras/stae2115","url":null,"abstract":"Galaxy groups contain the majority of bound mass with a significant portion of baryons due to the combination of halo mass and abundance (Cui 2024). Hence they serve as a crucial missing piece in the puzzle of galaxy formation and the evolution of large-scale structures in the Universe. In observations, mass-complete group catalogues are normally derived from galaxy redshift surveys detected through various three-dimensional group-finding algorithms. Confirming the reality of such groups, particularly in the X-rays, is critical for ensuring robust studies of galaxy evolution in these environments. Recent works have reported numerous optical groups that are X-ray undetected (see, e.g. Popesso et al. 2024), sparking debates regarding the reasons for the unexpectedly low hot gas fraction in galaxy groups. To address this issue, we utilise zoomed-in simulations of galaxy groups from the novel Hyenas project to explore the range of hot gas fractions within galaxy groups and investigate the intrinsic factors behind the observed variability in X-ray emission. We find that the halo formation time can play a critical role – we see that groups in halos that formed earlier exhibit up to an order of magnitude brighter X-ray luminosities compared to those formed later. This suggests that undetected X-ray groups are preferentially late-formed halos and highlights the connection between gas fraction and halo formation time in galaxy groups. Accounting for these biases in galaxy group identification is essential for advancing our understanding of galaxy formation and achieving precision in cosmological studies.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"138 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

RT-SNDETR: Real-time Supernova Detection via End-to-End Image Transformers RT-SNDETR：通过端到端图像变换器进行实时超新星探测

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-10 DOI: 10.1093/mnras/stae2107

Zhi-Ren Pan, Bo Qiu, Guang-Wei Li

{"title":"RT-SNDETR: Real-time Supernova Detection via End-to-End Image Transformers","authors":"Zhi-Ren Pan, Bo Qiu, Guang-Wei Li","doi":"10.1093/mnras/stae2107","DOIUrl":"https://doi.org/10.1093/mnras/stae2107","url":null,"abstract":"In large-scale astronomical surveys, traditional supernova detection pipelines rely on complex and relatively inefficient image differencing techniques. This paper proposes an end-to-end deep-learning supernova detection network, the Real-Time SuperNova DEtection TRansformer (RT-SNDETR). This network partially replaces traditional pipelines by integrating image differencing, source detection, and Real-bogus classification, achieving a speed 51.49 times that of the fastest image differencing method, SFFT. Additionally, it remains competitive with methods like YOLO v8, offering a well-balanced trade-off between speed and accuracy. Experimental results highlight RT-SNDETR’s superior performance, with an average precision(AP) of 96.30% on synthetic samples and 76.60% on real supernova samples. It significantly outperforms other detection networks, including RT-DETR (+5.6% AP on synthetic/+5.1% AP on real samples) and Cascade R-CNN (+8.9% AP on synthetic/+28.6% AP on real samples). The incorporation of CycleGAN-based data generation methods plays a significant role in enhancing RT-SNDETR’s performance. These methods simulate realistic PSF variations, enabling the object detection network to learn more robust features and improving its generalization to real supernovae data. Additionally, by integrating unsupervised domain adaptation techniques, RT-SNDETR achieves an AP of 81.70% on real SDSS supernova survey samples. This study demonstrates RT-SNDETR’s potential to significantly enhance both the speed and accuracy of supernova detection, making it a highly effective solution for large-scale astronomical surveys.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"16 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dissipated correction map method with trapezoidal rule for the simulations of gravitational waves from spinning compact binary 利用梯形法则的耗散修正图法模拟来自旋转紧凑双星的引力波

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-10 DOI: 10.1093/mnras/stae1997

Junjie Luo, Hong-Hao Zhang, Weipeng Lin

{"title":"Dissipated correction map method with trapezoidal rule for the simulations of gravitational waves from spinning compact binary","authors":"Junjie Luo, Hong-Hao Zhang, Weipeng Lin","doi":"10.1093/mnras/stae1997","DOIUrl":"https://doi.org/10.1093/mnras/stae1997","url":null,"abstract":"The correction map method means extended phase-space algorithm with correction map. In our research, we have developed a correction map method, specifically the dissipated correction map method with trapezoidal rule, for numerical simulations of gravitational waves from spinning compact binary systems. This new correction map method, denoted as $CM3$, has shown remarkable performance in various simulation results, such as phase-space distance, dissipated energy error, and gravitational waveform, closely resembling the high-order precision implicit Gaussian algorithm. When compared with the previously used mid-point map which is denoted as $C_2$, the $CM3$ consistently exhibits a closer alignment with the highly accurate Gaussian algorithm in waveform evolution and orbital trajectory analysis. Through detailed comparisons and analyses, it is evident that $CM3$ outperforms other algorithms, including $CM2$ and $C_2$ mentioned in this paper, in terms of accuracy and precision in simulating spinning compact binary systems. The incorporation of the trapezoidal rule and the optimization with a scale factor $gamma$ have significantly enhanced the performance of $CM3$, making it a promising method for future numerical simulations in astrophysics. With the groundbreaking detection of gravitational waves by the LIGO/VIRGO collaboration, interest in this research domain has soared. Our work contributes valuable insights for the application of matched filtering techniques in the analysis of gravitational wave signals, enhancing the precision and reliability of these detection.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"10 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The MAGPI Survey: Orbital distributions, intrinsic shapes, and mass profiles for MAGPI-like Eagle galaxies using Schwarzschild dynamical models MAGPI 巡天观测：使用施瓦兹柴尔德动力学模型的 MAGPI 样鹰星系的轨道分布、本征形状和质量剖面图

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-10 DOI: 10.1093/mnras/stae2114

Giulia Santucci, Claudia Del P Lagos, Katherine E Harborne, Caro Derkenne, Adriano Poci, Sabine Thater, Richard M McDermid, J Trevor Mendel, Emily Wisnioski, Scott M Croom, Anna Ferré-Mateu, Eric G M Muller, Jesse van de Sande, Gauri Sharma, Sarah M Sweet, Takafumi Tsukui, Lucas M Valenzuela, Glenn van de Ven, Tayyaba Zafar

{"title":"The MAGPI Survey: Orbital distributions, intrinsic shapes, and mass profiles for MAGPI-like Eagle galaxies using Schwarzschild dynamical models","authors":"Giulia Santucci, Claudia Del P Lagos, Katherine E Harborne, Caro Derkenne, Adriano Poci, Sabine Thater, Richard M McDermid, J Trevor Mendel, Emily Wisnioski, Scott M Croom, Anna Ferré-Mateu, Eric G M Muller, Jesse van de Sande, Gauri Sharma, Sarah M Sweet, Takafumi Tsukui, Lucas M Valenzuela, Glenn van de Ven, Tayyaba Zafar","doi":"10.1093/mnras/stae2114","DOIUrl":"https://doi.org/10.1093/mnras/stae2114","url":null,"abstract":"Schwarzschild dynamical models are now regularly employed in large surveys of galaxies in the local and distant Universe to derive information on galaxies’ intrinsic properties such as their orbital structure and their (dark matter and stellar) mass distribution. Comparing the internal orbital structures and mass distributions of galaxies in the distant Universe with simulations is key to understanding what physical processes are responsible for shaping galaxy properties. However it is first crucial to understand whether observationally derived properties are directly comparable with intrinsic ones in simulations. To assess this, we build Schwarzschild dynamical models for MUSE-like IFS cubes (constructed to be like those obtained by the MAGPI survey) of 75 galaxies at z ∼ 0.3 from the Eagle simulations. We compare the true particle-derived properties with the galaxies’ model-derived properties. In general, we find that the models can recover the true galaxy properties qualitatively well, with the exception of the enclosed dark matter, where we find a median offset of 48%, which is due to the assumed NFW profile not being able to reproduce the dark matter distribution in the inner region of the galaxies. We then compare our model-derived properties with Schwarzschild models-derived properties of observed MAGPI galaxies and find good agreement between MAGPI and Eagle: the majority of our galaxies (57%) have non-oblate shapes within 1 effective radius. More triaxial galaxies show higher fractions of hot orbits in their inner regions and tend to be more radially anisotropic.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"17 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid automatic multiple moving objects detection method based on feature extraction from images with non-sidereal tracking 基于图像特征提取和非实时跟踪的多移动物体快速自动检测方法

IF 4.8 3区物理与天体物理

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-09-09 DOI: 10.1093/mnras/stae2073

Lei Wang, Xiaoming Zhang, Chunhai Bai, Haiwen Xie, Juan Li, Jiayi Ge, Jianfeng Wang, Xianqun Zeng, Jiantao Sun, Xiaojun Jiang

{"title":"Rapid automatic multiple moving objects detection method based on feature extraction from images with non-sidereal tracking","authors":"Lei Wang, Xiaoming Zhang, Chunhai Bai, Haiwen Xie, Juan Li, Jiayi Ge, Jianfeng Wang, Xianqun Zeng, Jiantao Sun, Xiaojun Jiang","doi":"10.1093/mnras/stae2073","DOIUrl":"https://doi.org/10.1093/mnras/stae2073","url":null,"abstract":"Optically observing and monitoring moving objects, both natural and artificial, is important to human space security. Non-sidereal tracking can improve the system’s limiting magnitude for moving objects, which benefits the surveillance. However, images with non-sidereal tracking include complex background, as well as objects with different brightness and moving mode, posing a significant challenge for accurate multi-object detection in such images, especially in wide field of view (WFOV) telescope images. To achieve a higher detection precision in a higher speed, we proposed a novel object detection method, which combines the source feature extraction and the neural network. First, our method extracts object features from optical images such as centroid, shape, and flux. Then it conducts a naive labeling based on those features to distinguish moving objects from stars. After balancing the labeled data, we employ it to train a neural network aimed at creating a classification model for point-like and streak-like objects. Ultimately, based on the neural network model’s classification outcomes, moving objects whose motion modes consistent with the tracked objects are detected via track association, while objects with different motion modes are detected using morphological statistics. The validation, based on the space objects images captured in target tracking mode with the 1-meter telescope at Nanshan, Xinjiang Astronomical Observatory, demonstrates that our method achieves 94.72% detection accuracy with merely 5.02% false alarm rate, and a processing time of 0.66s per frame. Consequently, our method can rapidly and accurately detect objects with different motion modes from wide-field images with non-sidereal tracking.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"9 1","pages":""},"PeriodicalIF":4.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0