Journal article
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The following article is Open access
Casey Y. Lam,
Jessica R. Lu,
Andrzej Udalski,
Ian Bond,
David P. Bennett,
Jan Skowron,
Przemek Mróz,
Radek Poleski,
Takahiro Sumi,
Michał K. Szymański,
Szymon Kozłowski,
Paweł Pietrukowicz,
Igor Soszyński,
Krzysztof Ulaczyk,
Łukasz Wyrzykowski,
Shota Miyazaki,
Daisuke Suzuki,
Naoki Koshimoto,
Nicholas J. Rattenbury,
Matthew W. Hosek,
Fumio Abe,
Richard Barry,
Aparna Bhattacharya,
Akihiko Fukui,
Hirosane Fujii,
Yuki Hirao,
Yoshitaka Itow,
Rintaro Kirikawa,
Iona Kondo,
Yutaka Matsubara,
Sho Matsumoto,
Yasushi Muraki,
Greg Olmschenk,
Clément Ranc,
Arisa Okamura,
Yuki Satoh,
Stela Ishitani Silva,
Taiga Toda,
Paul J. Tristram,
Aikaterini Vandorou,
Hibiki Yama,
Natasha S. Abrams,
Shrihan Agarwal,
Sam Rose
and
Sean K. Terry
2022 ApJS 260 55
https://doi.org/10.3847/1538-4365/ac7441
This supplement provides supporting material for Lam et al. We briefly summarize past gravitational microlensing searches for black holes (BHs) and present details of the observations, analysis, and modeling of five BH candidates observed with both ground-based photometric microlensing surveys and Hubble Space Telescope astrometry and photometry. We present detailed results for four of the five candidates that show no or low probability for the lens to be a BH. In these cases, the lens masses are <2 M⊙, and two of the four are likely white dwarfs or neutron stars. We also present detailed methods for comparing the full sample of five candidates to theoretical expectations of the number of BHs in the Milky Way (∼108).