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Title:Lens parameters for Gaia18cbf – a long gravitational microlensing event in the Galactic plane
Authors:ID Kruszyńska, K. (Author)
ID Wyrzykowski, Ł. (Author)
ID Rybicki, K. A. (Author)
ID Maskoliūnas, M. (Author)
ID Bachelet, E. (Author)
ID Rattenbury, N. (Author)
ID Mróz, P. (Author)
ID Zieliński, P. (Author)
ID Howil, K. (Author)
ID Kaczmarek, Z. (Author)
ID Hodgkin, S. T. (Author)
ID Ihanec, N. (Author)
ID Gezer, I. (Author)
ID Gromadzki, M. (Author)
ID Mikołajczyk, P. (Author)
ID Stankevičiūtė, A. (Author)
ID Čepas, V. (Author)
ID Pakštienė, E. (Author)
ID Šiškauskaitė, K. (Author)
ID Zdanavičius, J. (Author)
ID Bozza, V. (Author)
ID Dominik, M. (Author)
ID Figuera Jaimes, R. (Author)
ID Fukui, A. (Author)
ID Hundertmark, M. (Author)
ID Narita, N. (Author)
ID Street, R. (Author)
ID Tsapras, Y. (Author)
ID Bronikowski, Mateusz, Center for Astrophysics and Cosmology, University of Nova Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia (Author)
ID Jabłońska, M. (Author)
ID Jabłonowska, A. (Author)
ID Ziółkowska, O. (Author)
Files:.pdf aa42602-21.pdf (9,87 MB)
MD5: 71147BD2256E063E63F2107579A4D58A
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Context. The timescale of a microlensing event scales as a square root of a lens mass. Therefore, long-lasting events are important candidates for massive lenses, including black holes. Aims. Here, we present the analysis of the Gaia18cbf microlensing event reported by the Gaia Science Alerts system. It exhibited a long timescale and features that are common for the annual microlensing parallax effect. We deduce the parameters of the lens based on the derived best fitting model. Methods. We used photometric data collected by the Gaia satellite as well as the follow-up data gathered by the ground-based observatories. We investigated the range of microlensing models and used them to derive the most probable mass and distance to the lens using a Galactic model as a prior. Using a known mass-brightness relation, we determined how likely it is that the lens is a main-sequence (MS) star. Results. This event is one of the longest ever detected, with the Einstein timescale of tE = 491.41−84.94+128.31 days for the best solution and tE = 453.74−105.74+178.69 days for the second best. Assuming Galaxy priors, this translates to the most probable lens masses of ML = 2.65−1.48+5.09 M⊙ and ML = 1.71−1.06+3.78 M⊙, respectively. The limits on the blended light suggest that this event was most likely not caused by a MS star, but rather by a dark remnant of stellar evolution.
Keywords:gravitational lensing: micro, Galaxy: stellar content, stars: black holes, stars: neutron, Astrophysics - Solar and Stellar Astrophysics
Publication version:Version of Record
Publication date:01.06.2022
Year of publishing:2022
Number of pages:12
Numbering:A&A, 662
PID:20.500.12556/RUNG-8628 New window
COBISS.SI-ID:171883523 New window
DOI:10.1051/0004-6361/202142602 New window
Publication date in RUNG:13.11.2023
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Record is a part of a journal

Title:Astronomy & Astrophysics
Shortened title:A&A
Publisher:EDP Sciences
Year of publishing:2022


Licensing start date:14.06.2022

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.