Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements

	Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements
	Kains, N.1; Calamida, A.1; Sahu, K. C.1; Casertano, S.1; Anderson, J.1; Udalski, A.2; Zoccali, M.3,4; Bond, H.1,5; Albrow, M.6; Bond, I.7
刊名	ASTROPHYSICAL JOURNAL
	2017-07-10
卷号	843 期号:2
关键词	astrometry gravitational lensing: micro stars: black holes stars: general
英文摘要	We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stellar remnants. We used the Hubble Space Telescope to monitor stars near the Galactic Center for three years, and we measured the brightness and positions of similar to 2 million stars at each observing epoch. In addition to this, we monitored the same pointings using the VIMOS imager on the Very Large Telescope. The stars we monitored include several bright microlensing events observed from the ground by the OGLE collaboration. In this paper, we present the analysis of our photometric and astrometric measurements for six of these events, and derive mass constraints for the lens in each of them. Although these constraints are limited by the photometric precision of ground-based data, and our ability to determine the lens distance, we were able to constrain the size of the Einstein ring radius thanks to our precise astrometric measurements-the first routine measurements of this type from a large-scale observing program. This demonstrates the power of astrometric microlensing as a tool to constrain the masses of stars, stellar remnants, and, in the future, extrasolar planets, using precise ground-and space-based observations.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GRAVITATIONAL LENSING EXPERIMENT ; DIFFERENCE IMAGE-ANALYSIS ; GALACTIC BULGE ; PROPER MOTIONS ; BLACK-HOLES ; PLANET ; PHOTOMETRY ; PARALLAX ; POPULATION ; PARAMETERS
收录类别	SCI
语种	英语
WOS记录号	WOS:000405549400006
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8870]
专题	国家天文台_星系宇宙学研究部
作者单位	1.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 2.Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland 3.Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile 4.Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile 5.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA 6.Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch 8020, New Zealand 7.Massey Univ, Inst Nat & Math Sci, Auckland 0745, New Zealand 8.Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland 9.Los Alamos Natl Lab, CCS 2, Los Alamos, NM 87545 USA 10.Univ Nevada, Dept Phys & Astron, 4505 South Maryland Pkwy, Las Vegas, NV 89154 USA
推荐引用方式 GB/T 7714	Kains, N.,Calamida, A.,Sahu, K. C.,et al. Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements[J]. ASTROPHYSICAL JOURNAL,2017,843(2).
APA	Kains, N..,Calamida, A..,Sahu, K. C..,Casertano, S..,Anderson, J..,...&Rejkuba, M..(2017).Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements.ASTROPHYSICAL JOURNAL,843(2).
MLA	Kains, N.,et al."Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements".ASTROPHYSICAL JOURNAL 843.2(2017).