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The Reuven Ramaty High Energy Solar Spectroscopic Imager observation of the 1809 keV line from Galactic 26Al
David M. Smith
Observations of the central radian of the Galaxy by the Reuven Ramaty High Energy Solar Spectroscopy Imager (RHESSI) have yielded a high-resolution measurement of the 1809 keV line…
Extended Emission from Cygnus X-3 Detected with Chandra
W. A. Heindl, J. A. Tomsick, R. Wijnands +1
We have discovered extended X-ray emission from the microquasar Cyg X-3 in archival Chandra X-ray Observatory observations. A 5" wide structure lies approximately 16" to the NE fro…
RHESSI as a Hard X-Ray Polarimeter
M. L. McConnell, J. M. Ryan, D. M. Smith +2
Polarization measurements of hard X-rays from solar flares can provide a direct handle on the extent to which the accelerated electrons are beamed, which, in turn, has important im…
Orbital and Super-Orbital Periods of 1E 1740.7-2942 and GRS 1758-258
D. M. Smith, W. A. Heindl, J. H. Swank
Five years of Rossi X-ray Timing Explorer (RXTE) observations of the Galactic black-hole candidates 1E 1740.7-2942 and GRS 1758-258 show a periodic modulation with amplitude 3-4% i…
Chandra High Resolution Camera Imaging of GRS 1758-258
W. A. Heindl, D. M. Smith
We observed the "micro-quasar" GRS 1758-258 four times with Chandra. Two HRC-I observations were made in 2000 September-October spanning an intermediate-to-hard spectral transition…
Long Term Variability of Cyg X-1 I. X-ray spectral-temporal correlations in the hard state
K. Pottschmidt, J. Wilms, M. A. Nowak +6
We present the long term evolution of the timing properties of the black hole candidate Cygnus X-1 in the 0.002-128 Hz frequency range as monitored from 1998 to 2001 with the RXTE.…