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73 papers · 1 filter
Infrared Spectroscopic Study of 8 Galactic Globular Clusters
Andrew W. Stephens, Jay A. Frogel
We have obtained medium-resolution infrared K band spectra of 44 giants in seven heavily reddened clusters in the Galactic bulge, as well as 12 giants in omega Centauri. We measure…
WFI J2026-4536 and WFI J2033-4723: Two New Quadruple Gravitational Lenses
Nicholas D. Morgan, John A. R. Caldwell, Paul L. Schechter +3
We report the discovery of two new gravitationally lensed quasars, WFI J2026-4536 and WFI J2033-4723, at respective source redshifts of z=2.23 and z=1.66. Both systems are quadrupl…
The Lack of Very Ultraluminous X-ray Sources in Early-type Galaxies
Jimmy A. Irwin, Joel N. Bregman, Alex E. Athey
We have searched for ultraluminous X-ray sources (ULXs) in a sample of 28 elliptical and S0 galaxies observed with Chandra. We find that the number of X-ray sources detected at a f…
XMM-Newton Observations of the Ultraluminous Nuclear X-ray Source in M33
L. Foschini, J. Rodriguez, Y. Fuchs +5
We present observations with XMM-Newton of M33 X-8, the ultraluminous X-ray source (L_{0.5-10 keV} ~ 2x10^39 erg/s) closest to the centre of the galaxy. The best-fit model is simil…
The First Detailed X-ray Observations of High-Redshift, Optically-Selected Clusters: XMM-Newton Results for Cl 1324+3011 at z = 0.76 and Cl 1604+4304 at z = 0.90
Lori M. Lubin, John S. Mulchaey, Marc Postman
We present the first detailed X-ray observations of optically-selected clusters at high redshift. Two clusters, Cl 1324+3011 at z = 0.76 and Cl 1604+4304 at z = 0.90, were observed…
Three Lyman-alpha Emitters at z approx 6: Early GMOS/Gemini Data from the GLARE Project
Elizabeth R. Stanway, Karl Glazebrook, Andrew J. Bunker +14
We report spectroscopic detection of three z~6 Lyman-alpha emitting galaxies, in the vicinity of the Hubble Ultra Deep Field, from the early data of the Gemini Lyman- at Reionis…