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The Milky Way Tomography with SDSS: I. Stellar Number Density Distribution
Mario Juric, Zeljko Ivezic, Alyson Brooks +23
Abridged: We estimate the distances to ~48 million stars detected by the Sloan Digital Sky Survey and map their 3D number density distribution in 100 < D < 20 kpc range over 6,500…
Microlensing optical depth toward the Galactic Bulge using bright sources from OGLE-II
T. Sumi, P. R. Wozniak, A. Udalski +8
We present a measurement of the microlensing optical depth toward the Galactic Bulge based on 4 years of the OGLE-II survey using Red Clump Giant (RCG). Using 32 events we find tau…
A Discovery of Rapid Optical Flares from Low-Luminosity Active Nuclei in Massive Galaxies
Tomonori Totani, Takahiro Sumi, George Kosugi +3
We report a serendipitous discovery of six very low-luminosity active galactic nuclei (AGNs) only by optical variability in one-month baseline. The detected flux variability is ~ 1…
Multiple Outbursts of a Cataclysmic Variable in the Globular Cluster M22
I. A. Bond, F. Abe, S. Eguchi +18
We present a 4 year light curve of a cataclysmic variable in M22, based on an analysis of accumulated data from the MOA microlensing survey. The position of the star coincides with…
The Optical Gravitational Lensing Experiment. Catalog of stellar proper motions in the OGLE-II Galactic bulge fields
T. Sumi, X. Wu, A. Udalski +8
We present a proper motion (μ) catalogue of 5,080,236 stars in 49 Optical Gravitational Lensing Experiment II (OGLE-II) Galactic bulge (GB) fields, covering a range of -11 deg. <l<…
Measurements of streaming motions of the Galactic bar with Red Clump Giants
T. Sumi, L. Eyer, P. R. Wozniak
We report a measurement of the streaming motion of the stars in the Galactic bar with the Red Clump Giants (RCGs) using the data of the Optical Gravitational Lensing Experiment II…