NAOC Open IR  > 星系宇宙学研究部
Using microlensed quasars to probe the structure of the Milky Way
Wang, Jian1,2; Smith, Martin C.3,4
2011
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume410Issue:2Pages:1135-1144
AbstractThis paper presents an investigation into the gravitational microlensing of quasars by stars and stellar remnants in the Milky Way. We present predictions for the all-sky microlensing optical depth, time-scale distributions and event rates for future large-area sky surveys. As expected, the total event rate increases rapidly with increasing magnitude limit, reflecting the fact that the number density of quasars is a steep function of magnitude. Surveys, such as Pan-STARRS and LSST, should be able to detect more than 10 events per year, with typical event durations of around 1 month. Since microlensing of quasar sources suffers from fewer degeneracies than lensing of Milky Way sources, they could be used as a powerful tool for recovering the mass of the lensing object in a robust, often model-independent, manner. As a consequence, for a subset of these events, it will be possible to directly 'weigh' the star (or stellar remnant) that is causing the lensing signal, either through higher order microlensing effects and/or high-precision astrometric observations of the lens star (using e.g. Gaia or SIM-lite). This means that such events could play a crucial role in stellar astronomy. Given the current operational timelines for Pan-STARRS and LSST, by the end of the decade, they could potentially detect up to 100 events. Although this is still too few events to place detailed constraints on Galactic models, consistency checks can be carried out and such samples could lead to exciting and unexpected discoveries.
KeywordGravitational Lensing: Micro Galaxy: Kinematics And Dynamics Galaxy: Structure
DOI10.1111/j.1365-2966.2010.17511.x
Indexed BySCI
Language英语
WOS IDWOS:000285766000033
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8385
Collection星系宇宙学研究部
Affiliation1.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
2.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Wang, Jian,Smith, Martin C.. Using microlensed quasars to probe the structure of the Milky Way[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,410(2):1135-1144.
APA Wang, Jian,&Smith, Martin C..(2011).Using microlensed quasars to probe the structure of the Milky Way.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,410(2),1135-1144.
MLA Wang, Jian,et al."Using microlensed quasars to probe the structure of the Milky Way".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 410.2(2011):1135-1144.
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