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Monthly Notices of the Royal Astronomical Society: Letters最新文献

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A tight N/O–potential relation in star-forming galaxies 恒星形成星系中紧密的 N/O 电位关系
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-07-25 DOI: 10.1093/mnrasl/slae071
N. Boardman, Vivienne Wild, N. V. Asari
{"title":"A tight N/O–potential relation in star-forming galaxies","authors":"N. Boardman, Vivienne Wild, N. V. Asari","doi":"10.1093/mnrasl/slae071","DOIUrl":"https://doi.org/10.1093/mnrasl/slae071","url":null,"abstract":"\u0000 We report a significantly tighter trend between gaseous N/O and M*/Re (a proxy for gravitational potential) than has previously been reported between gaseous metallicity and M*/Re, for star-forming galaxies in the MaNGA survey. We argue this result to be a consequence of deeper potential wells conferring greater resistance to metal outflows while also being associated with earlier star-formation histories, combined with N/O being comparatively unaffected by metal-poor inflows. The potential–N/O relation thus appears to be both more resistant to short-timescale baryonic processes and also more reflective of a galaxy’s chemical evolution state, when compared to previously-considered relations.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"42 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141805110","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
TeV afterglow from GRB 221009A: photohadronic origin? GRB 221009A 的 TeV 余辉：光电子起源？
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-07-01 DOI: 10.1093/mnrasl/slae063
S. Sahu, B. Medina-Carrillo, D. I. P'aez-S'anchez, G. S'anchez-Col'on, Subhash Rajpoot
{"title":"TeV afterglow from GRB 221009A: photohadronic origin?","authors":"S. Sahu, B. Medina-Carrillo, D. I. P'aez-S'anchez, G. S'anchez-Col'on, Subhash Rajpoot","doi":"10.1093/mnrasl/slae063","DOIUrl":"https://doi.org/10.1093/mnrasl/slae063","url":null,"abstract":"\u0000 Gamma-ray burst (GRB), GRB 221009A, a long-duration GRB, was observed simultaneously by the Water Cherenkov Detector Array (WCDA) and the Kilometer Squared Array (KM2A) of the Large High Altitude Air Shower Observatory (LHAASO) during the prompt emission and the afterglow periods. Characteristic multi-TeV photons up to 13 TeV were observed in the afterglow phase. The observed very high-energy (VHE) gamma-ray spectra by WCDA and KM2A during different time intervals and in different energy ranges can be explained very well in the context of the photohadronic model with the inclusion of extragalactic background light models. In the photohadronic scenario, interaction of high-energy protons with the synchrotron self-Compton (SSC) photons in the forward shock region of the jet is assumed to be the source of these VHE photons. The observed VHE spectra from the afterglow of GRB 221009A are similar to the VHE gamma-ray spectra observed from the temporary extreme high-energy peaked BL Lac (EHBL), 1ES 2344+514 only during the 11th and the 12th of August, 2016. Such spectra are new and have been observed for the first time in a GRB.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"64 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141694672","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
Constraining fundamental constants with fast radio bursts: Unveiling the role of energy scale 用快速射电暴制约基本常数：揭示能量尺度的作用
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-07-01 DOI: 10.1093/mnrasl/slae062
Surajit Kalita
{"title":"Constraining fundamental constants with fast radio bursts: Unveiling the role of energy scale","authors":"Surajit Kalita","doi":"10.1093/mnrasl/slae062","DOIUrl":"https://doi.org/10.1093/mnrasl/slae062","url":null,"abstract":"\u0000 Understanding physical mechanisms relies on the accurate determination of fundamental constants, although inherent limitations in experimental techniques introduce uncertainties into these measurements. This paper explores the uncertainties associated with measuring the fine-structure constant (α) and the proton-to-electron mass ratio (μ) using observed fast radio bursts (FRBs). We select 50 localized FRBs to quantify the effects of varying this fundamental coupling on the relation between dispersion measure and redshift. By leveraging independent measurements of dispersion measures and redshifts of these FRBs, we constrain the uncertainties in α and μ approximately to Δα/α = 1.99 × 10−5 and Δμ/μ = −1.00 × 10−5 within the standard ΛCDM cosmological framework. Remarkably, these constraints improve nearly an order-of-magnitude when considering a dynamical dark energy model. This investigation not only yields one of the most stringent constraints on α and μ to date but also emphasizes the criticality of accounting for the energy scale of the system when formulating constraints on fundamental parameters.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"48 33","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141689705","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
One-sided Hα excess before the first pericentre passage in galaxy Pairs 星系对中第一次圆周运动之前的单侧Hα过量
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-06-12 DOI: 10.1093/mnrasl/slae053
Jiwon Chung, J. Lee, Hyunjin Jeong
{"title":"One-sided Hα excess before the first pericentre passage in galaxy Pairs","authors":"Jiwon Chung, J. Lee, Hyunjin Jeong","doi":"10.1093/mnrasl/slae053","DOIUrl":"https://doi.org/10.1093/mnrasl/slae053","url":null,"abstract":"\u0000 We present novel insights into the interplay between tidal forces and star formation in interacting galaxies before their first pericentre passage. We investigate seven close pair galaxies devoid of visible tidal disturbances, such as tails, bridges, and shells. Using integral field spectroscopy (IFS) data of extended Calar Alto Legacy Integral Field Area (eCALIFA), we unveil a previously unreported phenomenon: Hα emission, a proxy for recent star formation, exhibits a significant enhancement in regions facing the companion galaxy, reaching up to 1.9 times higher flux compared to opposite directions. Notably, fainter companions within pairs display a more pronounced one-sided Hα excess, exceeding the typical range observed in isolated galaxies with 2σ confidence level. Furthermore, the observed Hα excess in fainter companion galaxies exhibits a heightened prominence at the outer galactic regions. These findings suggest that tidal forces generated before the first pericentre passage exert a stronger influence on fainter galaxies due to their shallower potential wells by their brighter companions. This unveils a more intricate interplay between gravitational interactions and star formation history within interacting galaxies than previously understood, highlighting the need further to explore the early stages of interaction in galaxy evolution.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"31 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141354576","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
Emirical calibration for helium abundance determinations in active galactic nuclei 活动星系核中氦丰度测定的经验校准
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-06-12 DOI: 10.1093/mnrasl/slae052
O. Dors, G. C. Almeida, C B Oliveira, S. R. Flury, R. Riffel, R. Riffel, M. Cardaci, G. Hägele, G. S. Ilha, A. Krabbe, K. Arellano-Córdova, P C Santos, I. N. Morais
{"title":"Emirical calibration for helium abundance determinations in active galactic nuclei","authors":"O. Dors, G. C. Almeida, C B Oliveira, S. R. Flury, R. Riffel, R. Riffel, M. Cardaci, G. Hägele, G. S. Ilha, A. Krabbe, K. Arellano-Córdova, P C Santos, I. N. Morais","doi":"10.1093/mnrasl/slae052","DOIUrl":"https://doi.org/10.1093/mnrasl/slae052","url":null,"abstract":"\u0000 For the first time, a calibration between the He i$lambda 5876$/H $beta$ emission line ratio and the helium abundance y = 12 + log(He/H) for Narrow line regions of Seyfert 2 Active Galactic Nuclei is proposed. In this context, observational data (taken from the SDSS-DR15 and from the literature) and direct abundance estimates (via the $T_{rm e}$-method) for a sample of 65 local ($z : lt : 0.2$) Seyfert 2 nuclei are considered. The resulting calibration estimates the y abundance with an average uncertainty of 0.02 dex. Applying our calibration to spectroscopic data containing only strong emission lines, it yields a helium abundance distribution similar to that obtained via the $T_{rm e}$-method. Some cautions must be considered to apply our calibration for Seyfert 2 nuclei with high values of electron temperature (${gtrsim} 20, 000$ K) or ionization parameter ($log U gt {-}2.0$).","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"26 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141353690","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
Testing quantised inertia on proxima centauri 在近人马座上测试量化惯性
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-25 DOI: 10.1093/mnrasl/slae047
M. E. McCulloch
{"title":"Testing quantised inertia on proxima centauri","authors":"M. E. McCulloch","doi":"10.1093/mnrasl/slae047","DOIUrl":"https://doi.org/10.1093/mnrasl/slae047","url":null,"abstract":"\u0000 The Alpha Centauri system has two close stars Alpha and Beta (A & B) and one much further away: Proxima Centauri. All three stars are co-moving with similar chemistry, which implies they are bound, but the fast orbit of Proxima implies it is gravitationally unbound given the visible mass of A and B. This problem cannot be fixed with the addition of dark matter, which must be uniform on such scales, or adding mass to A and B (their mass is well constrained) or by MoND. A new model for inertia called Quantised Inertia (QI) has been proposed that solves the galaxy rotation problem by reducing the inertia of low-acceleration stars at the galaxies’ edge in a new way, thus keeping them bound without the need for dark matter. It is shown here that if quantised inertia is applied to Proxima Centauri in the same way, it predicts the observed orbital velocity, within the bounds of observational uncertainty, and binds Proxima, without the need for extra mass.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"14 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141098212","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
An accurate and realistic polarization model for night-sky brightness 准确而逼真的夜空亮度偏振模型
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-25 DOI: 10.1093/mnrasl/slae048
M. Kocifaj, P. Markoš, F. Kundracik, J. C. Barentine, S. Wallner
{"title":"An accurate and realistic polarization model for night-sky brightness","authors":"M. Kocifaj, P. Markoš, F. Kundracik, J. C. Barentine, S. Wallner","doi":"10.1093/mnrasl/slae048","DOIUrl":"https://doi.org/10.1093/mnrasl/slae048","url":null,"abstract":"\u0000 Most measurements of the diffuse light of the night sky to date consider only the intensity of the light field, and current models can successfully reproduce these measurements. However, this approach is incomplete as it overlooks the polarization state of the light. Few measurements (and no successful models) of night-sky polarimetry appear in the literature. We present a new model of night-sky polarization that successfully reproduces observations in a heterogeneous environment and for a real distribution of finite-sized light sources over the intermediate region surrounding the observer. The model compares favourably with field measurements made in Slovakia in May 2021. The results described herein help advance understanding the angular distributions of artificial light at night from ground sources and the relative contributions of sources to the overall brightness of the night sky.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141098844","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
Merging filaments II: The origin of the tuning fork 合流丝 II：音叉的起源
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-22 DOI: 10.1093/mnrasl/slae045
Elena Hoemann, Andrea Socci, Stefan Heigl, Andreas Burkert, Alvaro Hacar
{"title":"Merging filaments II: The origin of the tuning fork","authors":"Elena Hoemann, Andrea Socci, Stefan Heigl, Andreas Burkert, Alvaro Hacar","doi":"10.1093/mnrasl/slae045","DOIUrl":"https://doi.org/10.1093/mnrasl/slae045","url":null,"abstract":"\u0000 We suggest that filaments in star-forming regions undergo frequent mergers. As stellar nurseries, filaments play a vital role in understanding star formation and mergers could pave the way for understanding the formation of more complex filamentary systems, such as networks and hubs. We compare the physical properties derived from hydrodynamic RAMSES simulations of merging filaments to those obtained from ALMA observations towards the LDN 1641-North region in Orion. We find similarities in the distributions of line-mass, column density and velocity dispersion. Such common features support the hypothesis of filament mergers shaping the structure of the interstellar medium.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"61 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141110360","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
HCN as a probe of the inner disk in a candidate proto-brown dwarf 作为候选原褐矮星内盘探测器的 HCN
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-18 DOI: 10.1093/mnrasl/slae044
B. Riaz, W.-F. Thi, M. Machida
{"title":"HCN as a probe of the inner disk in a candidate proto-brown dwarf","authors":"B. Riaz, W.-F. Thi, M. Machida","doi":"10.1093/mnrasl/slae044","DOIUrl":"https://doi.org/10.1093/mnrasl/slae044","url":null,"abstract":"\u0000 The detection of a Keplerian rotation is rare among Class 0 protostellar systems. We have investigated the high-density tracer HCN as a probe of the inner disk in a Class 0 proto-brown dwarf candidate. Our ALMA high angular resolution observations show the peak in the HCN (3-2) line emission arises from a compact component near the proto-brown dwarf with a small bar-like structure and a deconvolved size of ∼50 au. Radiative transfer modelling indicates that this HCN feature is tracing the innermost, dense regions in the proto-brown dwarf where a small Keplerian disk is expected to be present. The limited velocity resolution of the observations, however, makes it difficult to confirm the rotational kinematics of this feature. A brightening in the HCN emission towards the core center suggests that HCN can survive in the gas phase in the inner, dense regions of the proto-brown dwarf. In contrast, modelling of the HCO+ (3-2) line emission indicates that it originates from the outer pseudo-disk/envelope region and is centrally depleted. HCN line emission can reveal the small-scale structures and can be an efficient observational tool to study the inner disk properties in such faint compact objects where spatially resolving the disk is nearly impossible.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"104 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141124867","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
On the origin of the quasi-periodic micro-pulses observed in the radio-frequency emission of some neutron stars 关于在一些中子星射频发射中观测到的准周期性微脉冲的起源
Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-14 DOI: 10.1093/mnrasl/slae041
P. B. Jones
{"title":"On the origin of the quasi-periodic micro-pulses observed in the radio-frequency emission of some neutron stars","authors":"P. B. Jones","doi":"10.1093/mnrasl/slae041","DOIUrl":"https://doi.org/10.1093/mnrasl/slae041","url":null,"abstract":"\u0000 The linear relationship between pulsar micro-pulse widths and rotation period is consistent with the existence of a physical length L on the neutron-star surface and seen on the observer arc of transit across the polar cap. Within the ion-proton model it is the width of the minimum area of surface that can support the critical growth rate of the unstable two-beam Langmuir mode that is the source of the radio emission.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"51 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140978755","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
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