Microlensing by the galactic bar

  title={Microlensing by the galactic bar},
  author={HongSheng Zhao and David N. Spergel and U. R.MichaelRichColumbia and U. Princeton},
  journal={The Astrophysical Journal},
We compute the optical depth and duration distribution of microlensing events towrd Baade's window in a model composed of a Galactic disk and a bar. The bar model is a self-consistent dynamical model built out of individual orbits that has been populated to be consistent with the COBE maps of the Galaxy and kinematic observations of the Galactic bulge. We find that most of the lenses are in the bulge with a line-of-sight distance 6.25 kpc (adopting R(sub 0) = 8 kpc). The microlensing optical… 

On Microlensing Event Rates and Optical Depth toward the Galactic Center

The dependence of microlensing timescale frequency distributions and optical depth toward the Galactic center on Galactic model parameters is explored in detail for a distribution of stars consisting

Microlensing in the Galactic Bulge: Effects of the Disk behind the Bulge

A large number of microlensing events have been observed in the direction of the Galactic bulge, with a measured optical depth in the range 2-3×10−6. It has been shown that most of these events are

Microlensing Optical Depth toward the Galactic Bulge Using Bright Sources from OGLE-II

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)

The MACHO Project: Microlensing Optical Depth toward the Galactic Bulge from Difference Image Analysis

We present the microlensing optical depth toward the Galactic bulge based on the detection of 99 events found in our Difference Image Analysis (DIA) survey. This analysis encompasses 3 yr of data,

Stellar Contribution to the Galactic Bulge Microlensing Optical Depth

We estimate the optical depth to self-lensing by stars in the Galactic bulge using the Hubble Space Telescope star counts of Holtzman et al. and Zoccali et al. as extrapolated by Gould into the brown

Microlensing Optical Depth Revisited with Recent Star Counts

More reliable constraints on the microlensing optical depth can come from a better understanding of the Galactic model. Based on well-constrained Galactic bulge and disk models constructed from

The Macho Project: 45 Candidate Microlensing Events from the First Year Galactic Bulge Data

We report the detection of 45 candidate microlensing events in fields toward the Galactic bulge. These come from the analysis of 24 fields containing 12.6 million stars observed for 190 days in 1993.

Microlensing Optical Depth toward the Galactic Bulge Using Clump Giants from the MACHO Survey

Using 7 yr of MACHO survey data, we present a new determination of the optical depth to microlensing toward the Galactic bulge. We select the sample of 62 microlensing events (60 unique) on clump

Microlensing constraints on the Galactic bulge initial mass function

Aims. We seek to probe the Galactic bulge IMF starting from microlensing observations. Methods. We analyse the recent results of the microlensing campaigns carried out towards the Galactic bulge

Mass distribution in our Galaxy

This article summarizes recent work on the luminosity and mass distribution of the galactic bulge and disk, and on the mass of the Milky Way's dark halo. A new luminosity model consistent with the



Phys.Rev.D, in press

  • ApJ, 387,
  • 1991

Book-Review - the Center Bulge and Disk of the Milky-Way

A Coherent Picture of the Innermost Parsec of the Galaxy: F. Yusef-Zadeh, M. Wardle. Mid-Infrared Emission From the Galactic Centre D. Gezari. The Evolution of the Galactic Bulge R. M. Rich. The

Galactic Dynamics (Princeton

  • ApJS,
  • 1992