Monthly Notices of the Royal Astronomical Society: Letters最新文献_第2页

Correcting for the overabundance of low-mass quiescent galaxies in semi-analytic models 纠正半解析模型中低质量静态星系过多的问题

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-09 DOI: 10.1093/mnrasl/slae043

Jimi E. Harrold, O. Almaini, F. Pearce, R. Yates

{"title":"Correcting for the overabundance of low-mass quiescent galaxies in semi-analytic models","authors":"Jimi E. Harrold, O. Almaini, F. Pearce, R. Yates","doi":"10.1093/mnrasl/slae043","DOIUrl":"https://doi.org/10.1093/mnrasl/slae043","url":null,"abstract":"\u0000 We compare the L-Galaxies semi-analytic model to deep observational data from the UKIDSS Ultra Deep Survey (UDS) across the redshift range 0.5 < z < 3. We find that the over-abundance of low-mass, passive galaxies at high redshifts in the model can be attributed solely to the properties of ‘orphan’ galaxies, i.e. satellite galaxies where the simulation has lost track of the host dark matter subhalo. We implement a simple model that boosts the star-formation rates in orphan galaxies by matching them to non-orphaned satellite galaxies at a similar evolutionary stage. This straightforward change largely addresses the discrepancy in the low-mass passive fraction across all redshifts. We find that the orphan problem is somewhat alleviated by higher resolution simulations, but the preservation of a larger gas reservoir in orphans is still required to produce a better fit to the observed space density of low-mass passive galaxies. Our findings are also robust to the precise definition of the passive galaxy population. In general, considering the vastly different prescriptions used for orphans in semi-analytic models, we recommend that they are analysed separately from the resolved satellite galaxy population, particularly with JWST observations reigniting interest in the low-mass regime in which they dominate.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":" 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141129083","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

CN stretches around 4.4 microns dominate the IR absorption spectra of cyano-polycyclic aromatic hydrocarbons 4.4 微米左右的氯化萘延伸在氰基多环芳烃的红外吸收光谱中占主导地位

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-06 DOI: 10.1093/mnrasl/slae037

V. J. Esposito, R. C. Fortenberry, C. Boersma, A. Maragkoudakis, L. Allamandola

{"title":"CN stretches around 4.4 microns dominate the IR absorption spectra of cyano-polycyclic aromatic hydrocarbons","authors":"V. J. Esposito, R. C. Fortenberry, C. Boersma, A. Maragkoudakis, L. Allamandola","doi":"10.1093/mnrasl/slae037","DOIUrl":"https://doi.org/10.1093/mnrasl/slae037","url":null,"abstract":"\u0000 Anharmonic quantum chemical computations reveal a strong, narrow (width = 0.075 μm) band in the 4.3–4.5 μm region of the absorption spectra of the cyano-substituted polycyclic aromatic hydrocarbons (CN-PAHs) cyanonaphthalene, cyanoanthracene, cyanophenanthrene, and cyanopyrene. This narrow window with intense IR lines implies that CN-PAHs of various shapes and sizes offer little variation in both wavelength and intensity in this region. Subsequently, this band can be used as a tracer for CN-PAHs. The distinct features making up the band are assigned to mixed vibrational states consisting of the CN stretch fundamental and various combination bands, including in-plane CH bends, CC skeletal bends, and CC skeletal breathing motions. The extraordinarily large intrinsic intensity of the fundamental CN stretch is redistributed to nearby states via anharmonic coupling, which is readily captured when using second order vibrational perturbation theory with resonance polyad matrices. This redistribution of intensity leads to a complex spectrum. The intense bands in this wavelength region may contribute to the baseline continuum and undulating macroscopic structure seen in recent JWST NIRSpec observations.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"66 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141007668","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

MARTIANS (MARs2020, TIANwen and So on) would see more potentially hazardous asteroids than Earthlings 火星人（MARs2020、TIANwen 等）将比地球人看到更多潜在危险的小行星

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-04 DOI: 10.1093/mnrasl/slae040

Yufan Fane Zhou, Hailiang Li, Zhi-Yun Li, Li-Yong Zhou

引用次数: 0

Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar X射线瞬变体EP240309a（EP J115415.8-501810）的光学光谱和光度分类--中间极性

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-05-03 DOI: 10.1093/mnrasl/slae038

Stephen. B. Potter, D. A. H. Buckley, S. Scaringi, I. Monageng, O. D. Egbo, P. Charles, N. Erasmus, Carel van Gend, Egan Loubser, Keegan Titus, K. Rosie, H. Gajjar, H. Worters, Sunil Chandra, R. P. M. Julie, Moloko Hlakola

引用次数: 0

SDSS J222428.53+261423.2: unique emission lines properties unveil a sub-kiloparsec dual AGN candidate SDSS J222428.53+261423.2：独特的发射线特性揭示了一个亚千亿颗双AGN候选者

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-04-19 DOI: 10.1093/mnrasl/slae033

Qi Zheng, XueGuang Zhang, QiRong Yuan, Paola Severgnini, Cristian Vignali

引用次数: 0

Evidence of the gamma-ray counterpart from nova FM Cir with Fermi-LAT 用费米-激光雷达探测新星 FM Cir 的伽马射线对应物的证据

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-04-12 DOI: 10.1093/mnrasl/slae032

H. H. Wang, H. D. Yan, L.C.-C. Lin, J. Takata, P. Tam

引用次数: 0

The radius variations of accreting main sequence stars and mass transfer instability 吸积主序星的半径变化和质量转移不稳定性

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-04-09 DOI: 10.1093/mnrasl/slae029

Zi-Qi Zhao, Zhenwei Li, Lin Xiao, Hong-Wei Ge, Zhan-wen Han

{"title":"The radius variations of accreting main sequence stars and mass transfer instability","authors":"Zi-Qi Zhao, Zhenwei Li, Lin Xiao, Hong-Wei Ge, Zhan-wen Han","doi":"10.1093/mnrasl/slae029","DOIUrl":"https://doi.org/10.1093/mnrasl/slae029","url":null,"abstract":"\u0000 Many previous works studied the dynamical timescale mass transfer stability criteria based on the donor response with neglecting the stellar structure of the accretor. In this letter, we investigate the radial response of accretors with mass accumulation and its effect on the binary mass transfer stability. We perform a series of detailed stellar evolution simulations with different types of accretors and obtain the radial variations of stars accreting at different rates. Since the time within which the donor loses half of the original mass has a correlation with the donor mass, we approximately obtain the mean mass transfer rate as a function of mass ratio. Assuming that the common envelope (CE) phase occurs if the accretor radius exceeds the outer Roche lobe radius, we obtain the critical mass ratio of dynamically unstable mass transfer. We find the critical mass ratios for donors filling their Roche lobes at the Main Sequence (MS) and Hertzsprung Gap (HG) stages are smaller than that derived from the radial response of the donor in the traditional way. Our results may suggest that the binary is easier to enter into the CE phase for a donor star at the MS or HG stage than previously believed.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"68 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140726305","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

Primordial Intermediate and Supermassive Black Hole formation during the electron-positron annihilation epoch 电子-正电子湮灭纪的原始中间黑洞和超大质量黑洞的形成

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-04-09 DOI: 10.1093/mnrasl/slae028

José Laurindo de Góis Nóbrega Sobrinho, P. Augusto

引用次数: 0

The origin of the characteristic shape and scatter of intergalactic damping wings during reionization 再电离期间星系际阻尼翼的特征形状和散射的起源

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-04-08 DOI: 10.1093/mnrasl/slae022

L. Keating, E. Puchwein, J. Bolton, M. Haehnelt, Girish Kulkarni

{"title":"The origin of the characteristic shape and scatter of intergalactic damping wings during reionization","authors":"L. Keating, E. Puchwein, J. Bolton, M. Haehnelt, Girish Kulkarni","doi":"10.1093/mnrasl/slae022","DOIUrl":"https://doi.org/10.1093/mnrasl/slae022","url":null,"abstract":"\u0000 Lyα damping wings in the spectra of bright objects at high redshift are a useful probe of the ionization state of the intergalactic medium during the reionization epoch. It has recently been noted that, despite the inhomogeneous nature of reionization, these damping wings have a characteristic shape which is a strong function of the volume-weighted average neutral hydrogen fraction of the intergalactic medium. We present here a closer examination of this finding using a simulation of patchy reionization from the Sherwood-Relics simulation suite. We show that the characteristic shape and scatter of the damping wings are determined by the average neutral hydrogen density along the line of sight, weighted by its contribution to the optical depth producing the damping wing. We find that there is a redshift dependence in the characteristic shape due to the expansion of the Universe. Finally, we show that it is possible to differentiate between the shapes of damping wings in galaxies and young (or faint) quasars at different points in the reionization history at large velocity offsets from the point where the transmission first reaches zero.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"7 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140728624","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: An 8 per cent determination of the Hubble constant from localized fast radio bursts 更正：从局部快速射电暴确定哈勃常数的 8

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2024-03-29 DOI: 10.1093/mnrasl/slae020

引用次数: 0