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Very Broad [O III]4959,5007 Emission from the NGC 4472 Globular Cluster RZ2109 and Implications for the Mass of Its Black Hole X-ray Source
Stephen E. Zepf, Daniel Stern, Thomas J. Maccarone +6
We present Keck LRIS spectroscopy of the black hole-hosting globular cluster RZ2109 in the Virgo elliptical galaxy NGC 4472. We find that this object has extraordinarily broad [OII…
Mid-Infrared Selection of Active Galaxies
Daniel Stern, Peter Eisenhardt, Varoujan Gorjian +12
Mid-infrared photometry provides a robust technique for identifying active galaxies. While the ultraviolet to mid-infrared continuum of normal galaxies is dominated by the composit…
Morphologies and Spectral Energy Distributions of Extremely Red Galaxies in the GOODS-South Field
Leonidas A. Moustakas, Stefano Casertano, Chris Conselice +12
Using U'- through Ks-band imaging data in the GOODS-South field, we construct a large, complete sample of 275 ``extremely red objects'' (EROs; K_s<22.0, R-K_s>3.35; AB), all with d…
Large Area Lyman Alpha survey: finding young galaxies at z=4.5
Sangeeta Malhotra, James Rhoads, Arjun Dey +3
Strong Lyman-alpha emission is a signpost of young stars and the absence of dust and thus indicates young galaxies. To find such a population of young galaxies at z=4.5 we started…
A Polarimetric Search for Hidden Quasars in Three Radio Selected Ultraluminous Infrared Galaxies
Hien D. Tran, M. S. Brotherton, S. A. Stanford +4
We have carried out a spectropolarimetric search for hidden broad-line quasars in three ultraluminous infrared galaxies (ULIRGs) discovered in the positional correlations between s…
LBDS 53W091: An Old red Galaxy at z=1.552
Hyron Spinrad, Arjun Dey, Daniel Stern +4
The weak radio source LBDS 53W091 is associated with a very faint (R approx. 24.5) red (R-K approx. 5.8) galaxy. Long spectroscopic integrations with the W. M. Keck telescope have…