Authors
E Kuulkers, SE Shaw, A Paizis, Jérôme Chenevez, S Brandt, TJ-L Courvoisier, A Domingo, Ken Ebisawa, P Kretschmar, CB Markwardt, N Mowlavi, T Oosterbroek, A Orr, D Rísquez, C Sanchez-Fernandez, R Wijnands
Publication date
2007/5/1
Journal
Astronomy & Astrophysics
Volume
466
Issue
2
Pages
595-618
Publisher
EDP Sciences
Description
Aims
The Galactic bulge region is a rich host of variable high-energy point sources. Since 2005, February 17 we are monitoring the source activity in the Galactic bulge region regularly and frequently, i.e., about every three days, with the instruments onboard INTEGRAL. Thanks to the large field of view, the imaging capabilities and the sensitivity at hard X-rays, we are able to present for the first time a detailed homogeneous (hard) X-ray view of a sample of 76 sources in the Galactic bulge region.
Methods
We describe the successful monitoring program and show the first results from the start of the monitoring up to 2006, April 21, i.e., for a period of about one and a half year, during three visibility seasons. We focus on the short (hour), medium (month) and long-term (year) variability in the hard X-ray bands, i.e., 20-60 keV and 60-150 keV. When available, we discuss the simultaneous observations in the soft X-ray, 3 …
Total citations
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Scholar articles
E Kuulkers, SE Shaw, A Paizis, J Chenevez, S Brandt… - Astronomy & Astrophysics, 2007