High Temporal Resolution XMM/Newton Monitoring of PKS 2155-304
Abstract
The bright, strongly variable BL Lac object PKS 2155-304 was observed by XMM/Newton for two uninterrupted periods of ~11 and 16 hr in 30-31 May 2000. The source showed much stronger variations in the hard (0.8-10 keV) band than the soft (0.1-0.7 keV) band. After scaling the variability amplitudes, the hard and soft light curves had very similar overall shapes and tracked well on >1 hr long time scales. They did however show significant detailed differences on shorter time scales. No significant interband lag was detected down to limits of < ~0.5 hr. These results will be compared with previous claims, based on lower signal/noise light curves interrupted on the 1.6 hr orbital period, that the hard X-rays led the soft by ~0.3-1.1 hr. They will also be interpreted in terms of the SSC emission model of blazars.
- Publication:
-
American Astronomical Society Meeting Abstracts
- Pub Date:
- December 2000
- Bibcode:
- 2000AAS...19712507E