598 citations · 1.4k across the 23 of their papers we have counts for
6 papers · 2 filters
Monitoring RXTE Observations of Markarian 348: the origin of the column density variations
A. Akylas, I. Georgantopoulos, R. G. Griffiths +5
We analyze 37 RXTE observations of the type 2 Seyfert galaxy Mrk348 obtained during a period of 14 months. We confirm the spectral variability previous reported by Smith et al., in…
The X-ray Spectrum of Cyg X-2
C. Done, P. T. Zycki, D. A. Smith
The spectra of disc accreting neutron stars generally show complex curvature, and individual components from the disc, boundary layer and neutron star surface cannot be uniquely id…
A Chandra X-ray Study of Cygnus A - II. The Nucleus
Andrew J. Young, Andrew S. Wilson, Yuichi Terashima +2
We report Chandra ACIS and quasi-simultaneous RXTE observations of the nearby, powerful radio galaxy Cygnus A, with the present paper focusing on the properties of the active nucle…
A Chandra X-ray Study of Cygnus A - III. The Cluster of Galaxies
David A. Smith, Andrew S. Wilson, Keith A. Arnaud +2
The results from a recent Chandra ACIS-S study of the cluster surrounding Cygnus A are presented. We have deprojected the X-ray spectra taken from various elliptical shells in orde…
Scattered Light Models of Protostellar Envelopes: Multiple Outflow Cavities and Misaligned Circumstellar Disks
Kenneth Wood, David Smith, Barbara Whitney +4
Ground based imaging, imaging polarimetry, and recent Hubble Space Telescope WFPC2 and NICMOS images of protostars have revealed very complex scattered light patterns that cannot b…
A Chandra Observation of the Circinus Galaxy
David A. Smith, Andrew S. Wilson
We report on a recent Chandra ACIS-S observation of the Circinus galaxy. These observations confirm that the nuclear spectrum results from reflection of a hard X-ray continuum by `…