GRAVITATIONAL MICROLENSING BY NEUTRON STARS AND RADIO PULSARS: EVENT RATES, TIMESCALE DISTRIBUTIONS, AND MASS MEASUREMENTS

	GRAVITATIONAL MICROLENSING BY NEUTRON STARS AND RADIO PULSARS: EVENT RATES, TIMESCALE DISTRIBUTIONS, AND MASS MEASUREMENTS
	Dai, S.1,2,3; Smith, M. C.4; Lin, M. X.1,2; Yue, Y. L.5; Hobbs, G.3; Xu, R. X.1,2,6
刊名	ASTROPHYSICAL JOURNAL
	2015-04-01
卷号	802 期号:2 页码:1
关键词	gravitational lensing: micro pulsars: general stars: neutron
英文摘要	We investigate properties of Galactic microlensing events in which a stellar object is lensed by a neutron star. For an all-sky photometric microlensing survey, we determine the number of lensing events caused by similar to 10(5) potentially observable radio pulsars to be similar to 0.2 yr(-1) for 10(10) background stellar sources. We expect a few detectable events per year for the same number of background sources from an astrometric microlensing survey. We show that such a study could lead to precise measurements of radio pulsar masses. For instance, if a pulsar distance could be constrained through radio observations, then its mass would be determined with a precision of similar to 10%. We also investigate the timescale distributions for neutron star events, finding that they are much shorter than had been previously thought. For photometric events toward the Galactic center that last similar to 15 days, around 7% will have a neutron star lens. This fraction drops rapidly for longer timescales. Away from the bulge region we find that neutron stars will contribute similar to 40% of the events that last less than similar to 10 days. These results are in contrast to earlier work which found that the maximum fraction of neutron star events would occur on timescales of hundreds of days.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GALACTIC BULGE ; OPTICAL DEPTH ; SKY SURVEY ; MILKY-WAY ; OGLE-II ; ARRAY ; POPULATIONS ; PARALLAXES ; ASTROMETRY ; DISCOVERY
收录类别	SCI
语种	英语
WOS记录号	WOS:000353014500048
公开日期	2015-08-18
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18236]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Peking Univ, Sch Phys, Beijing 100871, Peoples R China 2.Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China 3.CSIRO, Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia 4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 6.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Dai, S.,Smith, M. C.,Lin, M. X.,et al. GRAVITATIONAL MICROLENSING BY NEUTRON STARS AND RADIO PULSARS: EVENT RATES, TIMESCALE DISTRIBUTIONS, AND MASS MEASUREMENTS[J]. ASTROPHYSICAL JOURNAL,2015,802(2):1.
APA	Dai, S.,Smith, M. C.,Lin, M. X.,Yue, Y. L.,Hobbs, G.,&Xu, R. X..(2015).GRAVITATIONAL MICROLENSING BY NEUTRON STARS AND RADIO PULSARS: EVENT RATES, TIMESCALE DISTRIBUTIONS, AND MASS MEASUREMENTS.ASTROPHYSICAL JOURNAL,802(2),1.
MLA	Dai, S.,et al."GRAVITATIONAL MICROLENSING BY NEUTRON STARS AND RADIO PULSARS: EVENT RATES, TIMESCALE DISTRIBUTIONS, AND MASS MEASUREMENTS".ASTROPHYSICAL JOURNAL 802.2(2015):1.