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8 papers · 2 filters
Forecasting Cosmic Doomsday from CMB/LSS Cross-Correlations
Jaume Garriga, Levon Pogosian, Tanmay Vachaspati
A broad class of dark energy models, which have been proposed in attempts at solving the cosmological constant problems, predict a late time variation of the equation of state with…
The Discovery of Quasisoft and Supersoft Sources in External Galaxies
R. Di Stefano, A. K. H. Kong
We apply a uniform procedure to select very soft sources from point sources observed by Chandra in 4 galaxies. This sample includes one elliptical galaxy (NGC 4967), 2 face-on spir…
The Ultraluminous X-ray Source NGC 1313 X-2 (MS 0317.7-6647) and its Environment
L. Zampieri, P. Mucciarelli, R. Falomo +5
We present new optical and {\it Chandra} observations of the field containing the ultraluminous X-ray source NGC 1313 X-2. On an ESO 3.6 m image, the {\it Chandra} error box embrac…
X-ray Point Sources in the Sombrero Galaxy: Supersoft sources, the globular cluster/LMXB connection, and an overview
R. Di Stefano, A. K. H. Kong, M. L. VanDalfsen +3
We report on the population of point sources discovered during an 18.5 ksec Chandra ACIS-S observation of the Sombrero Galaxy. We present the luminosity function, the spectra of th…
Supersoft X-ray Sources in M31: I. A Chandra Survey and an Extension to Quasisoft Sources
R. Di Stefano, A. K. H. Kong, J. Greiner +9
We report on very soft X-ray sources (VSSs) in M31. In a survey which was most sensitive to soft sources in four 8'x8' regions covered by Chandra's ACIS-S S3 CCD, we find 33 VSSs t…
A Luminous Recurrent Supersoft X-ray Source in NGC 300
A. K. H. Kong, R. Di Stefano
We report the results of XMM-Newton observations for an especially luminous supersoft X-ray source (SSS) with bolometric luminosity of 10^39 erg/s in the spiral galaxy NGC 300. The…