Monthly Notices of the Royal Astronomical Society最新文献_第3页

Estimation of stellar mass and star formation rate based on galaxy images 根据星系图像估算恒星质量和恒星形成率

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-16 DOI: 10.1093/mnras/stae1271

Jing Zhong, Zhijie Deng, Xiangru Li, Lili Wang, Haifeng Yang, Hui Li, Xirong Zhao

{"title":"Estimation of stellar mass and star formation rate based on galaxy images","authors":"Jing Zhong, Zhijie Deng, Xiangru Li, Lili Wang, Haifeng Yang, Hui Li, Xirong Zhao","doi":"10.1093/mnras/stae1271","DOIUrl":"https://doi.org/10.1093/mnras/stae1271","url":null,"abstract":"\u0000 It is crucial for a deeper understanding of the formation and evolution of galaxies in the universe to study stellar mass (M*) and star formation rate (SFR). Traditionally, astronomers infer the properties of galaxies from spectra, which are highly informative, but expensive and hard to be obtained. Fortunately, modern sky surveys obtained a vast amount of high spatial-resolution photometric images. The photometric images are obtained relatively economically than spectra, and it is very helpful for related studies if M* and SFR can be estimated from photometric images. Therefore, this paper conducted some preliminary researches and explorations on this regard. We constructed a deep learning model named GalEffNet for estimating integrated M* and specific star formation rate (sSFR) from DESI galaxy images. The GalEffNet primarily consists of a general feature extraction module and a parameter feature extractor. The research results indicate that the proposed GalEffNet exhibits good performance in estimating M* and sSFR, with σ reaching 0.218 dex and 0.410 dex. To further assess the robustness of the network, prediction uncertainty was performed. The results show that our model maintains good consistency within a reasonable bias range. We also compared the performance of various network architectures and further tested the proposed scheme using image sets with various resolutions and wavelength bands. Furthermore, we conducted applicability analysis on galaxies of various sizes, redshifts, and morphological types. The results indicate that our model performs well across galaxies with various characteristics and indicate its potentials of broad applicability.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"58 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140970804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stellar wind impact on early atmospheres around unmagnetized Earth-like planets 恒星风对未磁化类地行星周围早期大气层的影响

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-15 DOI: 10.1093/mnras/stae1267

Ada Canet, Jacobo Varela, Ana I Gómez de Castro

{"title":"Stellar wind impact on early atmospheres around unmagnetized Earth-like planets","authors":"Ada Canet, Jacobo Varela, Ana I Gómez de Castro","doi":"10.1093/mnras/stae1267","DOIUrl":"https://doi.org/10.1093/mnras/stae1267","url":null,"abstract":"\u0000 Stellar rotation at early ages plays a crucial role in the survival of primordial atmospheres around Earth-mass exoplanets. Earth-like planets orbiting fast-rotating stars may undergo complete photoevaporation within the first few hundred Myr driven by the enhanced stellar XUV radiation, while planets orbiting slow-rotating stars are expected to experience difficulty to lose their primordial envelopes. Besides the action of stellar radiation, stellar winds induce additional erosion on these primordial atmospheres, altering their morphology, extent, and causing supplementary atmospheric losses. In this paper, we study the impact of activity-dependent stellar winds on primordial atmospheres to evaluate the extent at which the action of these winds can be significant in the whole planetary evolution at early evolutionary stages. We performed 3D magnetohydrodynamical (MHD) simulations of the interaction of photoevaporating atmospheres around unmagnetized Earth-mass planets in the time-span between 50 and 500 Myr, analyzing the joint evolution of stellar winds and atmospheres for both fast- and slow-rotating stars. Our results reveal substantial changes in the evolution of primordial atmospheres when influenced by fast-rotating stars, with a significant reduction in extent at early ages. In contrast, atmospheres embedded in the stellar winds from slow-rotating stars remain largely unaltered. The interaction of the magnetized stellar winds with the ionized upper atmospheres of these planets allows to evaluate the formation and evolution of different MHD structures, such as double-bow shocks and induced magnetospheres. This work will shed light to the first evolutionary stages of Earth-like exoplanets, that are of crucial relevance in terms of planet habitability.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"57 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140974509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A closer look at the host-galaxy environment of high-velocity Type Ia supernovae 近距离观察高速 Ia 型超新星的宿主星系环境

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-15 DOI: 10.1093/mnras/stae1268

Han-Tang Lin, Yen-Chen Pan, Abdurro'uf

{"title":"A closer look at the host-galaxy environment of high-velocity Type Ia supernovae","authors":"Han-Tang Lin, Yen-Chen Pan, Abdurro'uf","doi":"10.1093/mnras/stae1268","DOIUrl":"https://doi.org/10.1093/mnras/stae1268","url":null,"abstract":"\u0000 Recent studies suggested that the ejecta velocity of Type Ia supernova (SN Ia) is a promising indicator in distinguishing the progenitor systems and explosion mechanisms. By classifying the SNe Ia based on their ejecta velocities, studies found SNe Ia with high $mathrm{Si}, small {II}, lambda 6355$ velocities (HV SNe Ia; $v gtrsim 12000$ km s−1) tend to be physically different from their normal-velocity counterparts (NV SNe Ia). In this work, we revisit the low-z sample studied in previous work and closely look into the spatially resolved environment local to the site of SN explosion. Our results reveal a possible trend (at 2.4σ significance) that HV SNe Ia are likely associated with older stellar populations than NV SNe Ia. While the trend is inconclusive, the local host-galaxy sample studied in this work is likely skewed toward massive galaxies, limiting the parameter space that we would like to investigate from the original parent sample. Nevertheless, our results do not rule out the possibility that parameters other than the host-galaxy age (such as metallicity) could be the underlying factors driving the differences between HV and NV SNe Ia due to the limitation of our dataset.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140975299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tidal disruption events from three-body scatterings and eccentricity pumping in the disks of active galactic nuclei 活动星系核盘中的三体散射和偏心泵产生的潮汐破坏事件

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-15 DOI: 10.1093/mnras/stae1263

Chaitanya Prasad, Yihan Wang, Rosalba Perna, K. Ford, B. McKernan

{"title":"Tidal disruption events from three-body scatterings and eccentricity pumping in the disks of active galactic nuclei","authors":"Chaitanya Prasad, Yihan Wang, Rosalba Perna, K. Ford, B. McKernan","doi":"10.1093/mnras/stae1263","DOIUrl":"https://doi.org/10.1093/mnras/stae1263","url":null,"abstract":"\u0000 Tidal Disruption Events (TDEs) are routinely observed in quiescent galaxies, as stars from the nuclear star cluster are scattered into the loss cone of the central supermassive black hole (SMBH). TDEs are also expected to occur in Active Galactic Nuclei (AGN), due to scattering or orbital eccentricity pumping of stars embedded in the innermost regions of the AGN accretion disk. Encounters with embedded stellar-mass black holes (BH) can result in AGN μTDEs. AGN TDEs and μTDEs could therefore account for a fraction of observed AGN variability. Here, by performing scattering experiments with the few-body code SpaceHub, we compute the probability of AGN TDEs and μTDEs as a result of 3-body interactions between stars and binary BHs. We find that AGN TDEs are more probable during the early life of the AGNs, when rates are $sim (6times 10^{-5}-5 times 10^{-2}) (f_bullet /0.01), rm {AGN}^{-1}$ yr−1 (where f• is the ratio between the number density of BHs and stars), generally higher than in quiescent galactic nuclei. By contrast, μTDEs should occur throughout the AGN lifetime at a rate of $sim (1times 10^{-4} - 4times 10^{-2})(f_bullet /0.01), rm {AGN}^{-1}$ yr−1. Detection and characterization of AGN TDEs and μ AGN TDEs with future surveys using Rubin and Roman will help constrain the populations of stars and compact objects embedded in AGN disks, a key input for the LVK AGN channel.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"122 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140977678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The binding of cosmological structures by massless topological defects 无质量拓扑缺陷对宇宙学结构的束缚

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-14 DOI: 10.1093/mnras/stae1258

Richard Lieu

引用次数: 0

The evolution of supermassive black hole mass–bulge mass relation by a semi-analytical model, ν2GC 超大质量黑洞质量-膨胀质量关系的半解析模型演化，ν2GC

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-13 DOI: 10.1093/mnras/stae1226

Tatsuki Shimizu, T. Oogi, Takashi Okamoto, M. Nagashima, M. Enoki

{"title":"The evolution of supermassive black hole mass–bulge mass relation by a semi-analytical model, ν2GC","authors":"Tatsuki Shimizu, T. Oogi, Takashi Okamoto, M. Nagashima, M. Enoki","doi":"10.1093/mnras/stae1226","DOIUrl":"https://doi.org/10.1093/mnras/stae1226","url":null,"abstract":"\u0000 We have investigated the redshift evolution of the relationship between supermassive black hole (SMBH) mass and host bulge mass using a semi-analytical galaxy formation model ν2GC. Our model reproduces the relation in the local universe well. We find that, at high redshift (z ≳ 3), two sequences appear in the SMBH mass–bulge mass plane. The emergence of these two sequences can be attributed to the primary triggers of the growth of the SMBHs and bulges: galaxy mergers and disc instabilities. The growth of SMBHs and bulges as a result of galaxy mergers is responsible for giving rise to the high-mass sequence, in which SMBHs are more massive for a given host bulge mass than in the low-mas sequence. Conversely, disc instabilities are accountable for the emergence of the low-mass sequence. At lower redshifts, galaxy mergers tend to become increasingly deficient in gas, resulting in a preferential increase of bulge mass without a corresponding growth in SMBH mass. This has the effect of causing galaxies in the upper sequence to shift towards the lower one on the SMBH mass–bulge mass plane. The galaxies that undergo dry mergers serve to bridge the gap between the two sequences, eventually leading to convergence into a single relation known in the local universe. Our results suggest that the observations of the SMBH mass–bulge mass relation in high redshifts can provide insight into their growth mechanisms.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"18 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140984154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to: The H i content of red geyser galaxies 更正：红色间歇泉星系的 H i 含量

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-13 DOI: 10.1093/mnras/stae891

引用次数: 0

EPOCHS Paper – VIII. An insight into MIRI-selected galaxies in SMACS-0723 and the benefits of deep MIRI photometry in revealing AGN and the dusty universe EPOCHS 论文 - VIII.深入了解 SMACS-0723 中的 MIRI 挑选星系以及深度 MIRI 测光在揭示 AGN 和尘埃宇宙方面的优势

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-13 DOI: 10.1093/mnras/stae964

Qiong Li, C. Conselice, Nathan Adams, J. Trussler, Duncan Austin, Thomas Harvey, Leonardo Ferreira, J. Caruana, K. Ormerod, I. Juodžbalis

{"title":"EPOCHS Paper – VIII. An insight into MIRI-selected galaxies in SMACS-0723 and the benefits of deep MIRI photometry in revealing AGN and the dusty universe","authors":"Qiong Li, C. Conselice, Nathan Adams, J. Trussler, Duncan Austin, Thomas Harvey, Leonardo Ferreira, J. Caruana, K. Ormerod, I. Juodžbalis","doi":"10.1093/mnras/stae964","DOIUrl":"https://doi.org/10.1093/mnras/stae964","url":null,"abstract":"\u0000 We present the analysis of the stellar population and star formation history of 181 MIRI selected galaxies at z = 0 − 3.5 in the massive galaxy cluster field SMACS J0723.3–7327, commonly referred to as SMACS0723, using the JWST Mid-Infrared Instrument (MIRI). We combine the data with the JWST Near Infrared Camera (NIRCam) catalogue, in conjunction with the Hubble Space Telescope (HST) WFC3/IR and ACS imaging. We find that the MIRI bands capture PAH features and dust emission, significantly enhancing the accuracy of photometric redshift and measurements of the physical properties of these galaxies. The median photo-z’s of galaxies with MIRI data are found to have a small 0.1 per cent difference from spectroscopic redshifts and reducing the error by 20 per cent. With MIRI data included in SED fits, we find that the measured stellar masses are unchanged, while the star formation rate is slightly lower by 0.1 dex. We also fit the median SED of active galactic nuclei (AGNs) and star-forming galaxies (SFG) separately. MIRI data provides tighter constraints on the AGN contribution, reducing the typical AGN contributions by ∼15 per cent. In addition, we also compare the median SED obtained with and without MIRI, and we find that including MIRI data yields steeper optical and UV slopes, indicating bluer colours, lower dust attenuation, and younger stellar populations. In the future, MIRI/MRS will enhance our understanding by providing more detailed spectral information and allowing for the study of specific emission features and diagnostics associated with AGN.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"88 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140984709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction to: Why the observed spin evolution of older-than-solar-like stars might not require a dynamo mode change 更正：为什么观测到的比太阳更老恒星的自旋演化可能不需要动力模式的改变

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-13 DOI: 10.1093/mnras/stae1209

K. Kotorashvili, Eric G. Blackman, James E. Owen

引用次数: 0

Detecting rare neutral atomic-carbon absorbers with a deep neural network 利用深度神经网络检测稀有中性原子-碳吸收体

Monthly Notices of the Royal Astronomical Society Pub Date : 2024-05-13 DOI: 10.1093/mnras/stae799

Jian Ge, K. Willis, Kaixuan Chao, Albert Jan, Yinan Zhao, Hannah Fang

{"title":"Detecting rare neutral atomic-carbon absorbers with a deep neural network","authors":"Jian Ge, K. Willis, Kaixuan Chao, Albert Jan, Yinan Zhao, Hannah Fang","doi":"10.1093/mnras/stae799","DOIUrl":"https://doi.org/10.1093/mnras/stae799","url":null,"abstract":"\u0000 C i absorbers play an important role as indicators for exploring the presence of cold gas in the interstellar medium of galaxies. However, the current data base of C i absorbers is very limited due to their weak absorption feature and rarity. Here, we report results from a search of C i λλ1560, 1656 absorption lines using Mg ii absorbers as signposts with modified deep learning algorithms, which provides a very quick way to search for weak C i absorber candidates. A total of 107 C i absorbers were detected, which nearly doubles the size of previously known samples. In addition, we found 17 C i absorbers to be associated with 2175 Å dust absorbers (2DAs), i.e. about 16 per cent C i absorbers are associated with 2DAs. Comparing the average dust depletion patterns of C i absorbers with those of damped Lyman α absorbers (DLAs), Mg ii absorbers, Ca ii absorbers, and 2175 Å dust absorbers (2DAs) shows that C i absorbers generally have environments with more dust than DLAs, Mg ii, and Ca ii absorbers, but similar to dust in 2DAs. Similarity between the dust depletion pattern of C i absorbers to that of the warm disc in the Milky Way indicates that C i absorption clouds are possibly associated with disc components in distant galaxies. Therefore, C i absorbers are confirmed to be excellent probes to trace cold gas and dust in the Universe.","PeriodicalId":506975,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"14 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140981980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0