271 citations · 1k across the 16 of their papers we have counts for
6 papers · 2 filters
Seyfert Galaxies and the Hard X-ray Background: Artificial Chandra Observations of z = 0.3 Active Galaxies
K. C. Peterson, S. C. Gallagher, A. E. Hornschemeier +2
Deep X-ray surveys have resolved much of the X-ray background radiation below 2 keV into discrete sources, but the background above 8 keV remains largely unresolved. The obscured (…
Isolated, Massive Supergiants near the Galactic Center
M. P. Muno, G. C. Bower, A. J. Burgasser +3
We have carried out a pilot project to assess the feasibility of using radio, infrared, and X-ray emission to identify young, massive stars located between 1 and 25 pc from the Gal…
Variation in the Scattering Shroud Surrounding Markarian 231
S. C. Gallagher, Gary D. Schmidt, Paul S. Smith +5
We present a detailed study of the nuclear structure of the highly polarized broad absorption line quasar, Mrk 231, through a multiwavelength campaign of Chandra observations, opti…
The evolution of the timing properties of the black-hole transient GX 339-4 during its 2002/2003 outburst
T. Belloni, J. Homan, P. Casella +5
We present the results of the timing and color analysis of more than two hundred RXTE/PCA observations of the bright black-hole transient GX 339-4 obtained during its 2002/2003 out…
XMM-Newton EPIC and OM Observations of Her X-1 over the 35 d Beat Period and an Anomalous Low State
S. Zane, G. Ramsay, M. A. Jimenez-Garate +4
We present the results of a series of XMM-Newton EPIC and OM observations of Her X-1, spread over a wide range of the 35 d precession period. We confirm that the spin modulation of…
Evidence for a Link Between Fe K-alpha Emission Line Strength and QPO Phase in a Black Hole
J. M. Miller, J. Homan
In X-ray binaries, the frequencies revealed in X-ray quasi-periodic oscillations (QPOs) are often interpreted as characteristic frequencies in the inner accretion disk, though the…