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Dynamical Evidence for a Black Hole in the Microquasar XTE J1550-564
Jerome A. Orosz, Paul J. Groot, Michiel van der Klis +6
Optical spectroscopic observations of the companion star (type G8IV to K4III) in the microquasar system XTE J1550-564 reveal a radial velocity curve with a best fitting spectroscop…
The X-ray Spectra of Black Hole X-ray Novae in Quiescence as Measured by Chandra
A. K. H. Kong, J. E. McClintock, M. R. Garcia +2
We present Chandra observations of black hole X-ray novae V404 Cyg, A0620-00, GRO J1655-40 and XTE J1550-564 in quiescence. Their quiescent spectra can be well fitted by a power-la…
X-ray Novae and the Evidence for Black Hole Event Horizons
Ramesh Narayan, Michael R. Garcia, Jeffrey E. McClintock
We discuss new observations of X-ray novae which provide strong evidence that black holes have event horizons. Optical observations of 13 X-ray novae indicate that these binary sta…
A Black Hole in the Superluminal source SAX J1819.3-2525 (V4641 Sgr)
Jerome A. Orosz, Erik Kuulkers, Michiel van der Klis +6
(shortened) Spectroscopic observations of the fast X-ray transient and superluminal jet source SAX J1819.3-2525 (V4641 Sgr) reveal a best fitting period of P_spect=2.81678 +/- 0.00…
Modeling the Low State Spectrum of the X-Ray Nova XTE J1118+480
A. A. Esin, J. E. McClintock, J. J. Drake +4
Based on recent multiwavelength observations of the new X-ray nova XTE J1118+480, we can place strong constraints on the geometry of the accretion flow in which a low/hard state sp…