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27 April 2024

» arxiv » astro-ph/0005466

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Galactic Bulge Microlensing Events with Clump Giants as Sources
P. Popowski ; C. Alcock ; R.A. Allsman ; D.R. Alves ; T.S. Axelrod ; A.C. Becker ; D.P. Bennett ; K.H. Cook ; A.J. Drake ; K.C. Freeman ; M. Geha ; K. Griest ; M.J. Lehner ; S.L. Marshall ; D. Minniti ; C.A. Nelson ; B.A. Peterson ; M.R. Pratt ; P.J. Quinn ; C.W. Stubbs ; W. Sutherland ; A.B. Tomaney ; T. Vandehei ; D. Welch ;
Date:	24 May 2000
Subject:	astro-ph
Affiliation:	The MACHO Collaboration
Abstract:	We present preliminary results of the analysis of 5 years of MACHO data on the Galactic bulge microlensing events with clump giants as sources. In particular, we discuss: 1) the selection of `giant’ events, 2) distribution of impact parameters, 3) distribution of event durations, 4) the concentration of long duration events in MACHO field 104 centered on (l,b) = (3.1,-3.0). We report the preliminary average optical depth of (2.0 +/- 0.4) x 10^{-6} (internal) at (l,b) = (3.9,-3.8). We discuss future work and prospects for building a coherent model of the Galaxy.
Source:	arXiv, astro-ph/0005466
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