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J/MNRAS/458/3012    OGLE-III Parallax microlensing events   (Wyrzykowski+, 2016)

Black hole, neutron star and white dwarf candidates from microlensing with OGLE-III. Wyrzykowski L., Kostrzewa-Rutkowska Z., Skowron J., Rybicki K.A., Mroz P., Kozlowski S., Udalski A., Szymanski M.K., Pietrzynski G., Soszynski I., Ulaczyk K., Pietrukowicz P., Poleski R., Pawlak M., Ilkiewicz K., Rattenbury N.J. <Mon. Not. R. Astron. Soc., 458, 3012-3026 (2016)> =2016MNRAS.458.3012W (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational lensing ; Milky Way ; Stars, distances ; Stars, masses Keywords: gravitational lensing: micro - stars: black holes - stars: neutron - white dwarfs - Galaxy: general Abstract: Most stellar remnants so far have been found in binary systems, where they interact with matter from their companions. Isolated neutron stars and black holes are difficult to find as they are dark, yet they are predicted to exist in our Galaxy in vast numbers. We explored the OGLE-III data base of 150 million objects observed in years 2001-2009 and found 59 microlensing events exhibiting a parallax effect due to the Earth's motion around the Sun. Combining parallax and brightness measurements from microlensing light curves with expected proper motions in the Milky Way, we identified 13 microlensing events which are consistent with having a white dwarf, neutron star or a black hole lens and we estimated their masses and distances. The most massive of our black hole candidates has 9.3M and is at a distance of 2.4kpc. The distribution of masses of our candidates indicates a continuum in mass distribution with no mass gap between neutron stars and black holes. We also present predictions on how such events will be observed by the astrometric Gaia mission. Description: The photometric data used here are the same as those used for our search for standard microlensing events (Wyrzykowski et al., 2015, Cat. J/ApJS/216/12). We explored the vast OGLE-III data base of light curves containing about 150 million sources over a number of stages in order to find microlensing events showing a parallax effect, which could be attributed to stellar remnant lenses. We have visually inspected all 3845 objects remaining after the rejection of variable stars and ghosts and selected 59 microlensing events which were clearly exhibiting parallax-like deviation from the standard model. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 84 59 Parallax microlensing events found in OGLE-III. table3.dat 282 142 Microlensing parallax model parameters as obtained from MCMC modelling for 13 dark remnant candidate events table5.dat 51 54 Most probable (1-D median and 1σ) masses, distances and total blend luminosities for all events with Red Clump sources
See also: J/ApJS/216/12 : OGLE-III Galactic bulge microlensing events (Wyrzykowski+ 2015) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Lens Lens name OGLE3-ULENS- (PAR-NNN) 9- 24 A16 --- OGLE OGLE DB ID (BLGNNN.N.NNNNNN) 25- 26 I2 h RAh Rigth ascension (J2000) 28- 29 I2 min RAm Rigth ascension (J2000) 31- 35 F5.2 s RAs Rigth ascension (J2000) 37 A1 --- DE- Declination sign (J2000) 38- 39 I2 deg DEd Declination (J2000) 41- 42 I2 arcmin DEm Declination (J2000) 44- 47 F4.1 arcsec DEs Declination (J2000) 51- 75 A25 --- EWS OGLE III EWS matches, YYYY-BLG-NNN 79- 84 F6.1 --- Length Length of the light curve (1)
Note (1): Length is the duration of the entire event, defined as the time between measurable microlensing deviation, depending on the photometric error-bar (see text).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Lens Lens name OGLE3-ULENS- (PAR-NNN) (1) 8- 22 A15 --- OGLE OGLE DB ID (BLGN.NNNNNN) 24- 29 F6.1 d t0 Median time of the closest lens-source approach 32- 37 F6.1 d E_t0 Error on t0 (upper value) 40- 44 F5.1 d e_t0 Error on t0 (lower value) 46- 51 F6.1 d tE Einstein radius crossing time (the events time-scale) 54- 58 F5.1 d E_tE Error on tE (upper value) 61- 65 F5.1 d e_tE Error on tE (lower value) 67- 74 F8.5 --- mu0 Minimum impact parameter 77- 83 F7.5 --- E_mu0 Error on mu0 (upper value) 86- 92 F7.5 --- e_mu0 Error on mu0 (lower value) 94- 99 F6.3 --- piEN North component of the parallax vector piE 102-106 F5.3 --- E_piEN Error on piEN (upper value) 109-113 F5.3 --- e_piEN Error on piEN (lower value) 115-120 F6.3 --- piEE East component of the parallax vector piE 123-127 F5.3 --- E_piEE Error on piEE (upper value) 130-134 F5.3 --- e_piEE Error on piEE (lower value) 136-141 F6.3 mag I0 Baseline magnitude 144-148 F5.3 mag E_I0 Error on I0 (upper value) 151-155 F5.3 mag e_I0 Error on I0 (lower value) 157-160 F4.2 --- fs Blending parameter (ratio of the source flux contribution to the total baseline flux) 163-166 F4.2 --- E_fs Error on fs (upper value) 169-172 F4.2 --- e_fs Error on fs (lower value) 174-178 F5.1 d tEh Heliocentric frame time-scales of event 181-184 F4.1 d E_tEh Error on tEh (upper value) 187-190 F4.1 d e_tEh Error on tEh (lower value) 192-195 F4.2 --- chi2 Best chi2 197-200 I4 --- dof Degree of freedom 202-207 F6.1 d t0Best Best time of the closest lens-source approach 209-214 F6.1 d tEBest Best Einstein radius crossing time 216-223 F8.5 --- mu0Best Best minimum impact parameter 225-230 F6.3 --- piENBest Best North component of the parallax vector piE 232-237 F6.3 --- piEEBest Best East component of the parallax vector piE 239-244 F6.3 mag I0Best Best baseline magnitude 246-249 F4.2 --- fsBest Best blending parameter 251-255 F5.1 d tEhBest Best heliocentric frame time-scales of event 257-265 F9.5 deg RAdeg Right ascension (J2000) 267-275 F9.5 deg DEdeg Declination (J2000) 277-282 F6.1 d t0par Reference time
Note (1): Multiple entries per event indicate different degenerate solutions found.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Lens Lens name OGLE3-ULENS- (PAR-NNN) 9- 11 F3.1 Msun Mass Most probable mass 13- 15 F3.1 Msun E_Mass Error on Mass (upper value) 17- 19 F3.1 Msun e_Mass Error on Mass (lower value) 21- 23 F3.1 kpc Dist Most probable distance 25- 27 F3.1 kpc E_Dist Error on Dist (upper value) 29- 31 F3.1 kpc e_Dist Error on Dist (lower value) 33- 37 F5.2 mag Blend Most probable total blend luminosity 39- 42 F4.2 mag E_Blend Error on Blend (upper value) 44- 47 F4.2 mag e_Blend Error on Blend (lower value) 49 A1 --- Solu0 [±] Solution for u0 (1) 51 A1 --- SolpiEN [±] Solution for piEN (1)
Note (1): Multiple entries are shown for different solutions found, indicated in the Solu0 and SolpiEN.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Feb-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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