J/A+A/674/A23 Gaia DR3 Microlensing events (Wyrzykowski+, 2023)
Gaia Data Release 3. Microlensing events from all over the sky.
Wyrzykowski L., Kruszynska K., Rybicki K.A., Holl B., Lecoeur-Taibi I.,
Mowlavi N., Nienartowicz K., Jevardat de Fombelle G., Rimoldini L.,
Audard M., Garcia-Lario P., Gavras P., Evans D.W., Hodgkin S.T., Eyer L.
<Astron. Astrophys. 674, A23 (2023)>
=2023A&A...674A..23W 2023A&A...674A..23W (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, variable ; Gravitational lensing
Keywords: catalogues - stars: general - gravitational lensing: micro
Abstract:
One of the rarest types of variability is the phenomenon of
gravitational microlensing, a transient brightening of a background
star due to an intervening lensing object. Microlensing is a powerful
tool in studying the invisible or otherwise undetectable populations
in the Milky Way, including planets and black holes.
We describe the first Gaia catalogue of microlensing event candidates,
give an overview of its content and discuss its validation. The
catalogue of Gaia microlensing events is composed by analysing the
light curves of around 2 billion sources of Gaia DR3 from all over the
sky covering 34 months between 2014 and 2017.
We present 363 Gaia microlensing events and discuss their properties.
Ninety events were never reported before and were not discovered by
other surveys. The contamination of the catalogue is assessed to
0.6-1.7%.
Description:
We presented the first catalogue of Gaia microlensing events from all
over the sky. We found 363 unique events, of which 90 were not known
before. The Gaia Data Release 3 contains complete light curves in G,
GBP and GRP Gaia bands as well as the parameters of microlensing
models from Level 0 and Level 1 fits. The catalogue is far from
complete, as the relatively short timespan of the data (2014-2017) and
a very large starting number of sources to investigate (2 billion)
required a very conservative approach in the search for potential
microlensing events.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tabled1.dat 83 363 All Gaia DR3 microlensing events, ordered by
their baseline magnitude in G-band
tablee1.dat 87 273 Gaia DR3 microlensing events cross-matched with
other detections in OGLE, MOA, KMT-NET,
ASAS-SN or Gaia Science Alerts surveys
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
I/358 : Gaia DR3 Part 4. Variability (Gaia Collaboration, 2022)
Byte-by-byte Description of file: tabled1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Short ID of the event following the
convention: GaiaDR3-ULENS-id
5- 23 I19 --- GaiaDR3 Gaia DR3 source_Id
25- 35 F11.7 deg RAdeg Right Ascension for J2000.0 equinox
37- 47 F11.7 deg DEdeg Declination for J2000.0 equinox
49- 59 F11.7 deg GLON Galactic longitude in decimal degrees
61- 71 F11.7 deg GLAT Galactic latitude in decimal degrees
73- 77 F5.2 mag Gmag G-band baseline magnitude
79- 83 A5 --- Method [AB+ ] A, B or A+B, method of the event
detection, see details in the paper
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Byte-by-byte Description of file: tablee1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Short ID of the event following the
convention: GaiaDR3-ULENS-id
5- 32 A28 --- OName1 Cross-matched events' name (1)
34- 52 A19 --- OName2 Cross-matched events' name (1)
54- 71 A18 --- OName3 Cross-matched events' name (1)
72- 88 A17 --- OName4 Cross-matched events' name (1)
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Note (1): OGLE survey detections come either from the EWS (OGLE-year-field-nnnn)
or catalogues published in Mroz et al. (2019ApJS..244...29M 2019ApJS..244...29M,
Cat. J/ApJS/244/29) and Mroz et al. (2020ApJS..249...16M 2020ApJS..249...16M, Cat. J/ApJS/249/16)
(BLGnnn.nn.nnnn or GDnnnn.nn.nnnnn or DGnnnn.nn.nnnnn)
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Acknowledgements:
Lukasz Wyrzykowski, wyrzykow(at)astrouw.edu.pl
(End) Patricia Vannier [CDS] 14-Jun-2022