Monthly Notices of the Royal Astronomical Society: Letters最新文献_第6页

SDSS J1619 with blue-shifted broad components in Hα and in [O iii] having similar line width and velocity shifts: a recoiling SMBH candidate? 在Hα和[O iii]中具有相似线宽和速度变化的蓝移宽组分的SDSS J1619:反冲SMBH候选者?

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-25 DOI: 10.1093/mnrasl/slad161

Xue-Guang Zhang

{"title":"SDSS J1619 with blue-shifted broad components in Hα and in [O <scp>iii</scp>] having similar line width and velocity shifts: a recoiling SMBH candidate?","authors":"Xue-Guang Zhang","doi":"10.1093/mnrasl/slad161","DOIUrl":"https://doi.org/10.1093/mnrasl/slad161","url":null,"abstract":"Abstract In this Letter, we report a potential candidate of recoiling supermassive black hole (rSMBH) in SDSS J1619 based on similar velocity shifts and line widths of the blue-shifted broad components in Hα and [O iii] doublet. The measured line width ratio between blue-shifted broad Hα and broad [O iii] line is 0.93, if compared with common values around 5.12 for normal Type-1 AGN, indicating different properties of the blue-shifted broad components in SDSS J1619 from those of normal QSOs. The virial BH mass MBHr derived from the broad Hα is consistent with the mass expected from the MBH − σ relation. The similar velocity shifts and line widths of the blue-shifted broad components in Hα and [O iii] and the virial BH mass derived from the Hα broad line emissions that is consistent with the mass expected from the MBH − σ relation, can be explained by a rSMBH scenario. Besides the rSMBH scenario, either the similar line widths of the blue-shifted broad components in Hα and in [O iii] or the consistency between the virial BH mass and the mass expected from the MBH − σ relation cannot be explained by the other proposed models in SDSS J1619.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135169003","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

Map-based cosmology inference with weak lensing – information content and its dependence on the parameter space 弱透镜信息含量的基于映射的宇宙学推理及其对参数空间的依赖

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-23 DOI: 10.1093/mnrasl/slad160

Supranta S Boruah, Eduardo Rozo

引用次数: 0

Metric f(R) gravity with dynamical dark energy as a scenario for the Hubble tension 度量f(R)重力与动态暗能量作为哈勃张力的场景

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-23 DOI: 10.1093/mnrasl/slad159

Giovanni Montani, Mariaveronica De Angelis, Flavio Bombacigno, Nakia Carlevaro

引用次数: 0

High-energy neutrinos from merging stellar-mass black holes in active galactic nuclei accretion disk 来自活动星系核吸积盘中合并恒星质量黑洞的高能中微子

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-22 DOI: 10.1093/mnrasl/slad176

Jin-Ping Zhu

{"title":"High-energy neutrinos from merging stellar-mass black holes in active galactic nuclei accretion disk","authors":"Jin-Ping Zhu","doi":"10.1093/mnrasl/slad176","DOIUrl":"https://doi.org/10.1093/mnrasl/slad176","url":null,"abstract":"A population of binary stellar-mass black hole (BBH) mergers are believed to occur embedded in the accretion disk of active galactic nuclei (AGNs). In this Letter, we demonstrate that the jets from these BBH mergers can propagate collimatedly within the disk atmosphere along with a forward shock and a reverse shock forming at the jet head. Efficient proton acceleration by these shocks is usually expected before the breakout, leading to the production of TeV−PeV neutrinos through interactions between these protons and electron-radiating photons via photon-meson production. AGN BBH mergers occurring in the outer regions of the disk are more likely to produce more powerful neutrino bursts. Taking the host AGN properties of the potential GW190521 electromagnetic (EM) counterpart as an example, one expects ≳ 1 neutrino events detectable by IceCube if the jet is on-axis and the radial location of the merger is R ≳ 105Rg, where Rg is the gravitational radius of the supermassive BH. Neutrino bursts from AGN BBH mergers could be detected by IceCube following the observation of gravitational waves (GWs), serving as precursor signals before the detection of EM breakout signals. AGN BBH mergers are potential target sources for future joint GW, neutrino, and EM multi-messenger observations.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139315529","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

Tides in clouds: control of star formation by long-range gravitational force 云中的潮汐:远距离引力对恒星形成的控制

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-17 DOI: 10.1093/mnrasl/slad149

Guang-Xing Li

{"title":"Tides in clouds: control of star formation by long-range gravitational force","authors":"Guang-Xing Li","doi":"10.1093/mnrasl/slad149","DOIUrl":"https://doi.org/10.1093/mnrasl/slad149","url":null,"abstract":"Abstract Gravity drives the collapse of molecular clouds through which stars form, yet the exact role of gravity in cloud collapse remains a complex issue. Studies point to a picture where star formation occurs in clusters. In a typical, pc-sized cluster-forming region, the collapse is hierarchical, and the stars should be born from regions of even smaller sizes ($approx 0.1,,rm pc$). The origin of this spatial arrangement remains under investigation. Based on a high-quality surface density map towards the Perseus region, we construct a 3D density structure, compute the gravitational potential, and derive eigenvalues of the tidal tensor (λmin, λmid, λmax, λmin &lt; λmid &lt; λmax), analyze the behavior of gravity at every location and reveal its multiple roles in cloud evolution. We find that fragmentation is limited to several isolated, high-density “islands”. Surrounding them, is a vast amount of the gas ($75~{{%}}$ of the mass, $95~{{%}}$ of the volume) stays under the influence of extensive tides where fragmentation is suppressed. This gas will be transported towards these regions to fuel star formation. The spatial arrangement of regions under different tides explains the hierarchical and localized pattern of star formation inferred from the observations. Tides were first recognized by Newton, yet this is the first time its dominance in cloud evolution has been revealed. We expect this link between cloud density structure and role gravity to be strengthened by future studies, resulting in a clear view of the star formation process.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136033664","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 Information Theory Approach to Identifying Signs of Life on Transiting Planets 识别凌日行星生命迹象的信息论方法

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-17 DOI: 10.1093/mnrasl/slad156

Sara Vannah, Marcelo Gleiser, Lisa Kaltenegger

引用次数: 0

Posterior Sampling of the Initial Conditions of the Universe from Non-linear Large Scale Structures using Score-Based Generative Models 利用基于分数的生成模型从非线性大尺度结构中对宇宙初始条件进行后验抽样

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-13 DOI: 10.1093/mnrasl/slad152

Ronan Legin, Matthew Ho, Pablo Lemos, Laurence Perreault-Levasseur, Shirley Ho, Yashar Hezaveh, Benjamin Wandelt

{"title":"Posterior Sampling of the Initial Conditions of the Universe from Non-linear Large Scale Structures using Score-Based Generative Models","authors":"Ronan Legin, Matthew Ho, Pablo Lemos, Laurence Perreault-Levasseur, Shirley Ho, Yashar Hezaveh, Benjamin Wandelt","doi":"10.1093/mnrasl/slad152","DOIUrl":"https://doi.org/10.1093/mnrasl/slad152","url":null,"abstract":"Abstract Reconstructing the initial conditions of the universe is a key problem in cosmology. Methods based on simulating the forward evolution of the universe have provided a way to infer initial conditions consistent with present-day observations. However, due to the high complexity of the inference problem, these methods either fail to sample a distribution of possible initial density fields or require significant approximations in the simulation model to be tractable, potentially leading to biased results. In this work, we propose the use of score-based generative models to sample realizations of the early universe given present-day observations. We infer the initial density field of full high-resolution dark matter N-body simulations from the present-day density field and verify the quality of produced samples compared to the ground truth based on summary statistics. The proposed method is capable of providing plausible realizations of the early universe density field from the initial conditions posterior distribution marginalized over cosmological parameters and can sample orders of magnitude faster than current state-of-the-art methods.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135805033","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: 3

Oxygen Bounty for Earth-like exoplanets: Spectra of Earth through the Phanerozoic 类地系外行星的富氧:地球到显生宙的光谱

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-13 DOI: 10.1093/mnrasl/slad147

R C Payne, L Kaltenegger

{"title":"Oxygen Bounty for Earth-like exoplanets: Spectra of Earth through the Phanerozoic","authors":"R C Payne, L Kaltenegger","doi":"10.1093/mnrasl/slad147","DOIUrl":"https://doi.org/10.1093/mnrasl/slad147","url":null,"abstract":"Abstract In the search for life in the universe, Earth provides a template of evolution for the one habitable planet we know. Earth's atmospheric composition has changed significantly throughout its history. The last 500 million years -the Phanerozoic Eon, which includes the origins of animals, dinosaurs, and land plants- saw oxygen rise from ≤10% to 35%. But the resulting transmission spectra are a crucial missing piece in our search for signs of life in exoplanet atmospheres. Here, we simulate the atmosphere and transmission spectra of the Phanerozoic, using estimates from established climate models, and present the first high-resolution transmission spectra for Phanerozoic Earth. We demonstrate that the spectral biosignature pairs O2+CH4 and O3+CH4 in the atmosphere of a transiting Earth-like planet would indicate a biosphere, with O2 and O3 features potentially stronger than for modern Earth. The full model and high-resolution transmission spectra, covering 0.4–20 μm, are available online and provides a tool to plan and optimize observations, train retrieval methods, and interpret upcoming observations with ground- and space-based telescopes.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135854760","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 anisotropic distribution of clusters in the local Universe 关于局部宇宙中星团的各向异性分布

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-11 DOI: 10.1093/mnrasl/slad199

Matthieu Schaller

{"title":"On the anisotropic distribution of clusters in the local Universe","authors":"Matthieu Schaller","doi":"10.1093/mnrasl/slad199","DOIUrl":"https://doi.org/10.1093/mnrasl/slad199","url":null,"abstract":"In his 2021 lecture to the Canadian Association of Physicists Congress, P.J.E. Peebles pointed out that the brightest extra-galactic radio sources tend to be aligned with the plane of the de Vaucouleur Local Supercluster up to redshifts of z = 0.02 ($d_{rm MW}approx 85~rm {Mpc}$). He then asked whether such an alignment of clusters is anomalous in the standard ΛCDM framework. In this letter, we employ an alternative, absolute orientation agnostic, measure of the anisotropy based on the inertia tensor axis ratio of these brightest sources and use a large cosmological simulation from the Flamingo suite to measure how common such an alignment of structures is. We find that only 3.5% of randomly selected regions display an anisotropy of their clusters more extreme than the one found in the local Universe’s radio data. This sets the region around the Milky Way as a 1.85σ outlier. Varying the selection parameters of the objects in the catalogue, we find that the clusters in the local Universe are never more than 2σ away from the simulations’ prediction for the same selection. We thus conclude that the reported anisotropy, whilst note-worthy, is not in tension with the ΛCDM paradigm.","PeriodicalId":18951,"journal":{"name":"Monthly Notices of the Royal Astronomical Society: Letters","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139320574","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

Radiation Modes in FRB 20220912A Microshots and a Crab PSR Nanoshot FRB 20220912A 微射影和蟹状 PSR 纳米射影中的辐射模式

Monthly Notices of the Royal Astronomical Society: Letters Pub Date : 2023-10-09 DOI: 10.1093/mnrasl/slad177

J. I. Katz

引用次数: 0