2022ApJ...937L..24M

Query : 2022ApJ...937L..24M

2022ApJ...937L..24M - Astrophys. J., 937, L24 (2022/October-1)

Systematic Errors as a Source of Mass Discrepancy in Black Hole Microlensing Event OGLE-2011-BLG-0462.

MROZ P., UDALSKI A. and GOULD A.

Abstract (from CDS):

Two independent groups reported the discovery of an isolated dark stellar remnant in the microlensing event OGLE-2011-BLG-0462 based on photometric ground-based observations coupled with astrometric measurements taken with the Hubble Space Telescope. These two analyses yielded discrepant mass measurements, with the first group reporting that the lensing object is a black hole of 7.1 ± 1.3 M⊙ whereas the other concluded that the microlensing event was caused by either a neutron star or a low-mass black hole (1.6-4.4 M⊙). Here, we scrutinize the available photometric and astrometric data and conclude that systematic errors are a cause of the discrepant measurements. We find that the lens is an isolated black hole with a mass of 7.88 ± 0.82 M⊙ located at a distance of 1.49 ± 0.12 kpc. We also study the impact of blending on the accuracy of astrometric microlensing measurements. We find that low-level blending by source companions is a major, previously unrecognized, challenge to astrometric microlensing measurements of black hole masses.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Astrometric microlensing effect - Astrophysical black holes - Black holes - Stellar remnants - Gravitational microlensing

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 OGLE-2011-BLG-0462 * 17 51 40.150 -29 53 26.15           ~ 41 0

Query : 2022ApJ...937L..24M

Basic data :
OGLE-2011-BLG-0462 -- Star
Other object types: otypes_help 		* (), Lev (MOA,OGLE)
ICRS coord. (ep=J2000) : 		17 51 40.150 -29 53 26.15 (Optical) [ ] C 2017A&A...605A..89B
FK4 coord. (ep=B1950 eq=1950) : 		17 48 28.004 -29 52 42.69 [ ]
Gal coord. (ep=J2000) : 		359.861263 -01.620810 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 134.0 [~] / z(~) 0.000447 [~] / cz 134.03 [~]
   (Opt) D 2017A&A...605A..89B
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Identifiers (2) :
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MOA 2011-BLG-191 OGLE-2011-BLG-0462

References (41 between 1850 and 2026) (Total 41)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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