J/ApJ/636/240 OGLE II microlensing parameters (Sumi+, 2006)
Microlensing optical depth toward the Galactic Bulge using bright sources from
OGLE-II.
Sumi T., Wozniak P.R., Udalski A., Szymanski M., Kubiak M., Pietrzynski G.,
Soszynski I., Zebrun K., Szewczyk O., Wyrzykowski L., Paczynski B.
<Astrophys. J., 636, 240-260 (2006)>
=2006ApJ...636..240S 2006ApJ...636..240S
ADC_Keywords: Gravitational lensing ; Stars, variable ; Photometry
Keywords: Galaxy: bulge - gravitational lensing - stars: variables: other
Abstract:
We present a measurement of the microlensing optical depth toward the
Galactic bulge based on 4 years of the OGLE-II survey. We consider
only bright sources in the extended red clump giant (RCG) region of
the color-magnitude diagram, in 20 bulge fields covering ∼5deg2
between 0°<l<3° and -4°<b←2°. Using a sample of
32 events we find τ=2.55x10-6 at (l,b)=(1.16°,-2.75°).
Description:
The data used in this analysis were collected between 1997 and 2000,
during the second phase of the OGLE experiment. All observations were
made with the 1.3m Warsaw telescope located at the Las Campanas
Observatory, Chile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 457 122 All 122 candidates with microlensing parameters
fitted with blending
tablea2.dat 457 122 All 122 candidates with microlensing parameters
fitted without blending
tablea3.dat 123 122 Cross-identification of candidates with other
sources
tablea4/* . 122 *The light curve data for all 122 candidates
tablea5.dat 48 540 Detection efficiencies for each field with blending
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Note on tablea4/*: files in this subdirectory are named according to
their OGLE designation
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See also:
ftp://bulge.princeton.edu/ogle/ogle2/ : OGLE II Repository
J/A+A/454/185 : Galactic Bulge microlensing optical depth (Hamadache+, 2006)
J/MNRAS/348/1439 : OGLE II Galactic center proper motions (Sumi+, 2004)
J/AcA/51/175 : OGLE-II DIA microlensing events (Wozniak+, 2001)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- OGLE Field number-Identification number
(SCNN-NNNNNN)
13 I1 --- Level Selection criteria level (1)
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 25 F5.2 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000)
39- 45 F7.2 pix Xpos X pixel position
47- 53 F7.2 pix Ypos Y pixel position
55- 60 F6.3 mag Imag The I band magnitude
62- 66 F5.3 mag (V-I) The (V-I) color index
68- 73 F6.3 mag I0mag Extinction corrected I band magnitude
75- 79 F5.3 mag (V-I)0 Extinction corrected (V-I) color index
81- 91 F11.6 d t0 Time of maximum magnification (HJD-2450000.0)
93-103 F11.5 d tE Event time-scale
105-114 F10.7 --- umin Minimum impact parameter in units of the
Einstein radius RE
116-129 F14.3 --- Amax Maximum magnification
131-144 F14.6 --- Fs Baseline source star flux fraction in ADUs
146-160 F15.6 --- Fb Baseline blended background star flux in ADUs
162-167 F6.3 mag Is Best fit source I band magnitude
169-178 F10.4 --- chi2 Χ2 of the the model fit
180-182 I3 --- Ndata Number of data points in light curve
184-190 F7.4 --- redchi2 Reduced Χ2 of the the model fit
192-198 F7.3 --- sigmax Maximum Significance of the data points.
200-207 F8.3 --- sumsig Integrated significance of the peak
209-217 F9.6 d e_t0 1σ symmetric error of t0
219-228 F10.6 d e1t0 1σ asymmetric lower error of t0
230-239 F10.6 d e2t0 1σ asymmetric upper error of t0
241-252 F12.5 d e_tE 1σ symmetric error of tE
254-265 F12.5 d e1tE 1σ asymmetric lower error of tE
267-275 F9.5 d e2tE 1σ asymmetric upper error of tE
277-285 F9.7 --- e_umin 1σ symmetric error of umin
287-297 F11.7 --- e1umin 1σ asymmetric lower error of umin
299-307 F9.7 --- e2umin 1σ asymmetric upper error of umin
309-320 F12.6 --- e_Fs 1σ symmetric error of Fs in ADUs
322-333 F12.6 --- e1Fs 1σ asymmetric lower error of Fs
335-345 F11.6 --- e2Fs 1σ asymmetric upper error of Fs
347-358 F12.6 --- e_Fb 1σ symmetric error of Fb in ADUs
360-371 F12.6 --- e1Fb 1σ asymmetric lower error of Fb
373-383 F11.6 --- e2Fb 1σ asymmetric upper error of Fb
385-390 F6.3 mag e_Is 1σ asymmetric lower error of Is
392-397 F6.3 mag E_Is 1σ asymmetric upper error of Is
399-401 I3 --- Ndatap Number of data points in the peak within 5tE
403-410 F8.4 --- redchi2p Reduced Χ2 of the model fit in the peak
412-417 F6.3 mag Is0mag Extinction corrected I band magnitude of
source
419-424 F6.3 mag e_Is0mag 1σ asymmetric lower error of Is0
426-431 F6.3 mag E_Is0mag 1σ asymmetric upper error of Is0
433-442 F10.4 --- fS Blending fraction Fs/(Fs+Fb)
444-450 F7.4 --- e1fS 1σ asymmetric lower error of fS
452-457 F6.4 --- e2fS 1σ asymmetric upper error of fS
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Note (1): Level from 0 (minimum number of data points) to 6 (serious
microlensing event), see Table 2 of paper.
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- OGLE Field number-Identification number (SCNN-NNNNNN)
13-123 A111 --- OName Other source identification(s) (1)
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Note (1): Source ID (with separation in arcsec) where:
MACHO = Thomas et al. 2004, 0410341;
MOA = Sumi et al., 2003ApJ...591..204S 2003ApJ...591..204S;
SMITH = Smith, Mao, & Wozniak, 2002MNRAS.332..962S 2002MNRAS.332..962S;
EROS = Afonso, C. et al., 2003A&A...404..145A 2003A&A...404..145A;
EROS2 = http://dphs10.saclay.cea.fr/Spp/Experiences/EROS/alertes.html;
JARO = Jaroszynski, M., 2002AcA....52...39J 2002AcA....52...39J.
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Byte-by-byte Description of file: tablea4/*
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Bytes Format Units Label Explanations
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1- 10 F10.5 d JD-2450000 Julian Date (minus 2450000)
12- 23 F12.6 --- Flux Observed flux (ADU)
25- 34 F10.6 --- e_Flux Error in Flux (ADU)
36- 42 F7.3 mag Imag Observed I band magnitude
44- 50 F7.5 mag e_Imag Error in Imag
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Byte-by-byte Description of file: tablea5.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- Field Name of file (SCNN)
6- 7 I2 --- tEi Integer value of 10*log of the event time-scale
10- 13 F4.2 [d] log(tE) Log of the event time-scale (1)
16- 23 F8.4 d tE Event time-scale
25- 31 I7 --- Nout Number of output artificial events
33- 38 I6 --- Nin Number of input artificial events
40- 48 F9.6 --- Deff Detection efficiency
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Note (1): Indicates the mid point of the bin, i.e., the first bin is
log(tE)=0-0.1.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Sep-2006