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Discovery of Two Types of X-ray Dips in Cyg X-1
Y. X. Feng, Wei Cui
We observed Cyg X-1 with {\em RXTE} contiguously over its 5.6-day binary orbit. The source was found to be in the hard state throughout the observation. Many intensity dips were de…
A Peculiar Flaring Episode of Cygnus X-1
Wei Cui, Yuxin Feng, Mark Ertmer
Recent monitoring of Cyg X-1 with {\em RXTE} revealed a period of intense flaring, which started in October of 2000 and lasted until March of 2001. The source exhibited some quite…
Highly Ionized Absorption in the X-ray Spectrum of Cyg X-1
H. L. Marshall, N. S. Schulz, T. Fang +4
Using the Chandra High Energy Transmission Grating Spectrometer (HETGS), we have found significant absorption features in the X-ray spectrum of Cyg X-1 taken in the continuous cloc…
The Evolving Accretion Disc in the Black Hole X-ray Transient XTE J1859+226
R. I. Hynes, C. A. Haswell, S. Chaty +2
We present HST, RXTE, and UKIRT observations of the broad band spectra of the black hole X-ray transient XTE J1859+226 during the decline from its 1999-2000 outburst. Our UV spectr…
The First High Resolution X-ray Spectrum of Cyg X-1: Soft X-Ray Ionization and Absorption
N. S. Schulz, W. Cui, C. R. Canizares +4
We observed the black hole candidate Cyg X-1 for 15 ks with the High-Energy Transmission Grating Spectrometer aboard the CHANDRA X-ray Observatory. The source was observed during a…
VERITAS: the Very Energetic Radiation Imaging Telescope Array System
T. C. Weekes
The Very Energetic Radiation Imaging Telescope Array System (VERITAS) represents an important step forward in the study of extreme astrophysical processes in the universe. It combi…