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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…