OGLE-III microlensing events and the structure of the Galactic bulge. (2015)
Keywords :
catalogs; Galaxy bulge; Galaxy: structure; gravitational lensing: micro
Abstract:We present and study the largest and most comprehensive catalog of microlensing events ever constructed. The sample of standard microlensing events comprises 3718 unique events from 2001-2009 with 1409 events that had not been detected before in real-time by the Early Warning System of the Optical Gravitational Lensing Experiment. The search pipeline uses machine learning algorithms to help find rare phenomena among 150 million objects and to derive the detection efficiency. Applications of the catalog can be numerous, from analyzing individual events to large statistical studies of the Galactic mass, kinematics distributions, and planetary abundances. We derive maps of the mean Einstein ring crossing time of events spanning
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The data used in this work were photometry of 150 million objects
toward more than 31deg^2^ of the Galactic bulge observed in almost
74000 frames, i.e., about 11000 billion data points. We selected 91
fields out of all 177 ever observed by the Optical Gravitational
Lensing Experiment (OGLE) Udalski et al. (2008AcA....58...69U) in its
third phase from 2001 July until 2009 May, which had at least 250
observations. We use the re-reduced data obtained after the end of
OGLE-III. For the final sample of microlensing events, we additionally
produced new photometry which took into account the exact position of
each event on the difference imaging technique (DIA, Wozniak 2000,
J/AcA/50/421) image (see section 2).
- J/AcA/63/21 : VI light curves of Galactic LPVs (Soszynski+, 2013)
- J/other/Nat/481.167 : 2002-2007 PLANET microlensing events (Assan+, 2012)
- J/ApJ/711/L48 : 2008 OGLE Bulge microlensing alerts (Cohen+, 2010)
- J/A+A/475/1159 : Supervised classification of var. stars (Debosscher+, 2007)
- J/A+A/466/157 : Bulge Microlensing Events (Soto+, 2007)
- J/A+A/454/185 : EROS-2 microlensing parameters (Hamadache+, 2006)
- J/ApJ/636/240 : OGLE II microlensing parameters (Sumi+, 2006)
- J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)
- J/MNRAS/343/1131 : 1998-2000 OGLE events microlensing limits (Tsapras+, 2003)
- J/AcA/53/1 : OGLE eclipsing binaries in LMC (Wyrzykowski+, 2003)
- J/AcA/52/217 : OGLE II. VI photometry of Galactic Bulge (Udalski+, 2002)
- J/AcA/51/175 : OGLE-II DIA microlensing events (Wozniak+, 2001)
- J/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)
- J/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)
- http://ogle.astrouw.edu.pl/ : OGLE home page
- ftp : //ftp.astrouw.edu.pl/ogle/ogle3/blg_tau/