AGN Observations with H{center_dot}E{center_dot}S{center_dot}S{center_dot}

Journal Article · Mon Feb 21 04:00:00 EST 2005 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1878443· OSTI ID:20630530

Lemiere, Anne ^[1]

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1. Physique Corpusculaire et Cosmologie, IN2P3/CNRS, College de France, II Place Marcelin Berthelot, F-75231 Paris Cedex 05 (France)

H{center_dot}E{center_dot}S{center_dot}S{center_dot} (High Energy Stereoscopic System) is fully operational since December 2003. Two AGNs have been detected since the first telescope became operational (June, 2002): PKS 2155-304 and Mkn 421. The BL Lac PKS 2155-304 at redshift z = 0.117 has been observed for over 80 hours during 2002 (mono mode) and 2003 (stereo). The source was found to be active in all periods of observation with a steep spectrum. In early April 2004, flaring activity of Mkn 421 was detected in X-rays with the All-Sky Monitor (ASM) aboard the Rossi X-ray Timing Explorer (RXTE) satellite. Mkn 421 has subsequently been monitored with the H{center_dot}E{center_dot}S{center_dot}S{center_dot} array at very large zenith angles. We will report here on the analysis of these data from H{center_dot}E{center_dot}S{center_dot}S{center_dot} together with the multiwavelength campaigns on these sources.

• OSTI ID: 20630530
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 745; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COSMIC GAMMA SOURCES
COSMIC PHOTONS
COSMIC RAY DETECTION
GAMMA ASTRONOMY
SATELLITES
TELESCOPE COUNTERS
X RADIATION