J/AcA/50/1 OGLE microlensing events in Galactic Bulge (Udalski+, 2000)
The Optical Gravitational Lensing Experiment.
Catalog of microlensing events in the Galactic Bulge.
Udalski A., Zebrun K., Szymanski M., Kubiak M., Pietrzynski G.,
Soszynski I., Wozniak P.
<Acta Astron., 50, 1-65 (2000)>
=2000AcA....50....1U 2000AcA....50....1U
ADC_Keywords: Gravitational lensing
Keywords: gravitational lensing - dark matter - Galaxy: center -
Galaxy: structure - catalogs - surveys
Abstract:
We present the Catalog of microlensing events detected toward the
Galactic bulge in three observing seasons, 1997-1999, during the
OGLE-II microlensing survey. The search for microlensing events was
performed using a database of about 4x109 photometric measurements
of about 20.5 million stars from the Galactic bulge. The Catalog
comprises 214 microlensing events found in the fields covering about
11 square degrees on the sky and distributed in different parts of the
Galactic bulge. The sample includes 20 binary microlensing events, 14
of them are caustic crossing. In one case a double star is likely
lensed. We present distribution of the basic parameters of
microlensing events and show preliminary rate of microlensing in
different regions of the Galactic bulge. The latter reveals clear
dependence on the Galactic coordinates. The dependence on l indicates
that the majority of lenses toward the Galactic bulge are located in
the Galactic bar. Models of the Galactic bar seem to reasonably
predict the observed spatial distribution of microlensing events in
the Galactic bulge. All data presented in the Catalog and photometry
of all events are available from the OGLE Internet archive.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 49 Names and equatorial coordinates of the OGLE-II
fields in the Galactic bulge
table2.dat 134 214 Parameters of the microlensing events
lc/* . 214 Individual light curves
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See also:
ftp://sirius.astrouw.edu.pl/ogle/ogle2 : OGLE2 Home Page
J/AcA/51/175 : OGLE-II DIA microlensing events (Wozniak+, 2001)
J/MNRAS/343/1131 : 1998-2000 OGLE events microlensing limits (Tsapras+, 2003)
J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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2- 5 A4 --- --- [BUL_]
6- 9 A4 --- Field Field designation (SCNN)
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 31 I2 arcsec DEs Declination (J2000)
33- 38 F6.2 deg GLON [-12/11] Galactic longitude
40- 44 F5.2 deg GLAT Galactic latitude
46- 48 I3 --- Nobs Number of observations
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [BUL_]
5- 8 A4 --- Field Field designation (SCNN) (1)
10- 15 I6 --- Star Star number, in the field (1)
17- 27 A11 --- EWs EWs name when the microlensing event was
detected in real time
29- 30 I2 h RAh Right ascension (J2000)
32- 33 I2 min RAm Right ascension (J2000)
35- 39 F5.2 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 51 F4.1 arcsec DEs Declination (J2000)
53- 57 F5.2 deg GLON [-12/11] Galactic longitude
59- 63 F5.2 deg GLAT Galactic latitude
65- 72 F8.3 d Tmax ?=- Moment of maximum brightness (HJD-2450000)
74- 78 F5.3 d e_Tmax ?=- rms uncertainty on Tmax
80- 85 F6.2 d t0 ?=- Time of Einstein radius crossing
87- 90 F4.2 d e_t0 ?=- rms uncertainty on t0
92 A1 --- l_Amax Limit flag on Amax
93- 97 F5.2 --- Amax ?=- Magnification at maximum brightness
99-102 F4.2 --- e_Amax ?=- rms uncertainty on Amax
104-109 F6.3 mag Imin ?=- I-band baseline magnitude
111-115 F5.3 mag e_Imin ?=- rms uncertainty on Imin
117-120 A4 --- Rem Remarks
122-134 A13 --- FileName Name of the file containing the light curve
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Note (1): Identified as OGLE BUL-SCNN NNNNNN in Simbad
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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3- 12 F10.5 d HJD-2450000 HJD minus 2450000
15- 20 F6.3 mag Imag I-band magnitude
24- 28 F5.3 mag e_Imag rms uncertainty on Imag
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History: Copied at ftp://sirius.astrouw.edu.pl/ogle/ogle2/microlensing/gb/
(End) Patricia Vannier [CDS] 21-Sep-2006