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7 papers · 2 filters
Evidence for an Intermediate-Mass Black Hole: Chandra and XMM-Newton Observations of the Ultraluminous Supersoft X-ray Source in M101 during its 2004 Outburst
A. K. H. Kong, R. Di Stefano, F. Yuan
We report the results of Chandra and XMM-Newton observations of a new outburst of an ultraluminous supersoft X-ray source in M101. CXOU J140332.3+542103 was observed in a low lumin…
Evolving dark energy equation of state and CMB/LSS cross-correlation
Levon Pogosian
CMB power spectra and the SNIa luminosity-redshift curves have difficulty distinguishing between models with the same average value of the dark energy equation of state. We propose…
Quasisoft X-Ray Sources: Unusual States of Stellar-Mass Objects, or Intermediate Mass Black Holes?
R. Di Stefano, F. A. Primini, A. K. H. Kong +1
Chandra observations of nearby galaxies have revealed a number of X-ray sources characterized by high luminosities ( erg s) and in the range $100 -…
Early reionization by cosmic strings revisited
Levon Pogosian, Alexander Vilenkin
Measurements of the CMB temperature anisotropy and the temperature-polarization cross correlation by WMAP suggest a reionization redshift of . On the other hand, o…
Anthropic predictions for vacuum energy and neutrino masses
Levon Pogosian, Alexander Vilenkin, Max Tegmark
It is argued that the observed vacuum energy density and the small values of the neutrino masses could be due to anthropic selection effects. Until now, these two quantities have b…
Supersoft X-ray sources in M31: II. ROSAT-detected supersoft sources in the ROSAT, Chandra and XMM eras
J. Greiner, R. DiStefano, A. Kong +1
We have performed Chandra observations during the past 3 years of 5 of the M31 supersoft X-ray sources (SSS) discovered with ROSAT. Surprisingly, only one of these sources has been…