NAOC Open IR
Microlensing predictions: impact of Galactic disc dynamical models
Yang, Hongjing1; Mao, Shude1,2; Zang, Weicheng1; Zhang, Xiangyu1
2021-04-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume502Issue:4Pages:5631-5642
AbstractGalactic model plays an important role in the microlensing field, not only for analyses of individual events but also for statistics of the ensemble of events. However, the Galactic models used in the field vary, and some are unrealistically simplified. Here, we tested three Galactic disc dynamic models; the first is a simple standard model that was widely used in this field, the second model considers the radial dependence of the velocity dispersion, and the last model employs the asymmetric drift in the disc velocity distribution. We found that for a typical lens mass M-L = 0.5 M-circle dot, the two new dynamical models predict similar to 16 per cent or similar to 5 percent less long-time-scale events (e.g. microlensing time-scale t(E) > 300 d) and and more short-time-scale events (t(E) < 3 d) than the standard model. Moreover, the microlensing event rate as a function of Einstein radius theta(E) or microlensing parallax pi(E) also shows some model dependence (a few percent). The two new models also have an impact on the total microlensing event rate. This result will also to some degree affect the Bayesian analysis of individual events, but overall, the impact is small. However, we still recommend that modellers should be more careful when choosing the Galactic model, especially in statistical works involving Bayesian analyses of a large number of events. Additionally, we find the asymptotic power-law behaviours in both theta(E) and pi(E) distributions, and we provide a simple model to understand them.
Keywordgravitational lensing: micro planets and satellites: general stars: black holes Galaxy: kinematics and dynamics
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
DOI10.1093/mnras/stab441
Language英语
Funding ProjectNational Natural Science Foundation of China[11821303] ; National Natural Science Foundation of China[11761131004]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000637320100068
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78272
Collection中国科学院国家天文台
Corresponding AuthorYang, Hongjing
Affiliation1.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Yang, Hongjing,Mao, Shude,Zang, Weicheng,et al. Microlensing predictions: impact of Galactic disc dynamical models[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,502(4):5631-5642.
APA Yang, Hongjing,Mao, Shude,Zang, Weicheng,&Zhang, Xiangyu.(2021).Microlensing predictions: impact of Galactic disc dynamical models.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,502(4),5631-5642.
MLA Yang, Hongjing,et al."Microlensing predictions: impact of Galactic disc dynamical models".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 502.4(2021):5631-5642.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Yang, Hongjing]'s Articles
[Mao, Shude]'s Articles
[Zang, Weicheng]'s Articles
Baidu academic
Similar articles in Baidu academic
[Yang, Hongjing]'s Articles
[Mao, Shude]'s Articles
[Zang, Weicheng]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Yang, Hongjing]'s Articles
[Mao, Shude]'s Articles
[Zang, Weicheng]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.