J/ApJ/893/65 VVV Survey microlensing events in the Gal. Bulge (Navarro+, 2020)
VVV Survey microlensing: catalog of best and forsaken events.
Navarro M.G., Contreras Ramos R., Minniti D., Pullen J.,
Capuzzo-Dolcetta R., Lucas P.W.
<Astrophys. J., 893, 65 (2020)>
=2020ApJ...893...65N 2020ApJ...893...65N
ADC_Keywords: Milky Way; Gravitational lensing; Photometry, infrared; Surveys
Keywords: Galaxy bulges ; Galactic bulge ; Galaxy structure ;
Gravitational microlensing ; Microlensing event rate
Abstract:
We search for microlensing events in the zero-latitude area of the
Galactic Bulge using the VVV Survey near-IR data. We have discovered a
total sample of N=630 events within an area covering 20.68deg2
between the years 2010 and 2015. In this paper, we describe the search
and present the data for the final sample, including near-IR
magnitudes, colors, and proper motions, as well as the standard
microlensing parameters. We use the near-IR color-magnitude and
color-color diagrams to select NRC=290 events with red-clump sources
to analyze the extinction properties of the sample in the central
region of the Galactic plane. The timescale distribution and its
dependence in the longitude axis is presented. The mean timescale
decreases as we approach the Galactic minor axis (b=0°).
Finally, we give examples of special microlensing events, such as
binaries, short-timescale events, and events with a strong parallax
effect.
Description:
The VVV observations are carried out with the 4m VISTA telescope,
located at Cerro Paranal, Chile. The field of view of the wide-field
VISTA InfraRed Camera (VIRCAM) is 1.6deg2, which is called a "tile".
The entire set of VVV observations comprises 348 tiles: 196 tiles in
the Bulge and 152 in the disk area. The VVV observation schedule
includes single-epoch photometry in the ZYJHKs bands and a variability
campaign in the Ks band.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 111 630 VVV Survey first quality microlensing events
table3.dat 34 1955 VVV Survey second quality microlensing events
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See also:
B/eso : ESO Science Archive Catalog (ESO, 1991-2021)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/337 : VISTA Variables in the Via Lactea Survey DR1 (Saito+, 2012)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/364 : VIRAC. The VVV Infrared Astrometric Catalogue (Smith+, 2019)
J/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)
J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)
J/ApJ/636/240 : OGLE II microlensing parameters (Sumi+, 2006)
J/ApJ/711/L48 : 2008 OGLE Bulge microlensing alerts (Cohen+, 2010)
J/ApJ/778/150 : Microlensing events from MOA-II (Sumi+, 2013)
J/ApJS/216/12 : OGLE-III Gal. bulge microlensing events (Wyrzykowski+, 2015)
J/MNRAS/457/4089 : Frequency of snowline-region planets (Shvartzvald+, 2016)
J/MNRAS/464/1247 : VVV high PM stars. I. Ks≤13.5 stars (Kurtev+, 2017)
J/ApJS/244/29 : Microlensing events toward the Galactic bulge (Mroz+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Tile [327/340] Tile number
5- 15 A11 --- ID Identifier (<[NCM2020] bNNN NNNNNN> or
<[NCM2020] bNNN NNNNNN-NNNNNN> in Simbad;
bNNN being the Tile number)
17- 24 F8.5 deg GLON [-9.94/10.4] Galactic longitude
26- 33 F8.5 deg GLAT [-0.5/0.7] Galactic latitude
35- 39 F5.2 mag Ksmag [10.7/17.7]? Apparent Ks band magnitude; baseline
41- 41 A1 --- l_J-K Limit flag on J-K
42- 46 F5.2 mag J-K [0.4/8.8]? The (J-K) color index
48- 51 F4.2 mag Amp [0.13/3.8]? Amplitude
53- 56 F4.2 --- u0 [0/1.7] Minimum impact parameter in Einstein radii
58- 58 A1 --- l_u0 Upper limit on u0 uncertainty
60- 64 F5.2 --- e_u0 [0/2] Uncertainty in u0
66- 73 F8.2 d t0 [55389.9/57282.8] MJD of maximum magnification
75- 80 F6.2 d e_t0 [0/327] Uncertainty in t0
82- 87 F6.2 d tE [3.5/750] Einstein radius crossing time
89- 89 A1 --- l_tE Upper limit on tE uncertainty
91- 97 F7.2 d e_tE [0.49/636] Uncertainty in tE
99-102 F4.2 --- fbl [0/1] Blending parameter
104-104 A1 --- l_fbl Upper limit on fbl
106-111 F6.2 --- e_fbl [0/20] Uncertainty in fbl
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Tile [327/340] Tile number
5- 10 I6 --- ID Identifier (<[NCM2020] bNNN NNNNNN> in Simbad)
12- 19 F8.5 deg GLON [-9.94/10.5] Galactic longitude
21- 28 F8.5 deg GLAT [-0.5/0.7] Galactic latitude
30- 34 F5.2 mag Ksmag [9.18/17.7] Apparent Ks band magnitude; baseline
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Sep-2021