Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis

Details Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis

2002-07-27

arxiv.org/abs/astro-ph/0207604v2

Astrophys.J. 591 (2003) 204-227

Astronomy and Astrophysics

Astrophysics

65 pages and 30 figures, accepted for publication in ApJ. A systematic bias and uncertainty in the optical depth measurement h

Scientific paper

10.1086/375212

We analyze the data of the gravitational microlensing survey carried out by by the MOA group during 2000 towards the Galactic Bulge (GB). Our observations are designed to detect efficiently high magnification events with faint source stars and short timescale events, by increasing the the sampling rate up to 6 times per night and using Difference Image Analysis (DIA). We detect 28 microlensing candidates in 12 GB fields corresponding to 16 deg^2. We use Monte Carlo simulations to estimate our microlensing event detection efficiency, where we construct the I-band extinction map of our GB fields in order to find dereddened magnitudes. We find a systematic bias and large uncertainty in the measured value of the timescale $t_{\rm Eout}$ in our simulations. They are associated with blending and unresolved sources, and are allowed for in our measurements. We compute an optical depth tau = 2.59_{-0.64}^{+0.84} \times 10^{-6} towards the GB for events with timescales 0.310). These events are useful for studies of extra-solar planets.

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