Volume 368, Number 1, March II 2001
|Page(s)||38 - 43|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 March 2001|
The 0.1-200 keV spectrum of the blazar PKS 2005-489 during an active state
Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate, Italy
2 SAX Science Data Center, ASI, Via Corcolle, 19, 00131 Roma, Italy
3 SISSA/ISAS, via Beirut 2-4, 34014 Trieste, Italy
4 Istituto di Fisica Cosmica G.Occhialini, CNR, Via Bassini 15, 20133 Milano, Italy
5 South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa
6 Osservatorio Astronomico di Brera, Via Brera, 28, 20121 Milano, Italy
7 Istituto di Fisica, Università dell'Insubria, Via Lucini 3, 22100 Como, Italy
Corresponding author: G. Tagliaferri, email@example.com
Accepted: 20 December 2000
The bright BL Lac object PKS 2005-489 was observed by BeppoSAX on November 1-2, 1998, following an active X-ray state detected by RossiXTE. The source, detected between 0.1 and 200 keV, was in a very high state with a continuum well fitted by a steepening spectrum due to synchrotron emission only. Our X-ray spectrum is the flattest ever observed for this source. The different X-ray spectral slopes and fluxes, as measured by various satellites, are consistent with relatively little changes of the peak frequency of the synchrotron emission, always located below 1017 Hz. We discuss these results in the framework of synchrotron self-Compton models. We found that for the BeppoSAX observation, the synchrotron peak frequency is between 1015 and 2.5 1016 Hz, depending on the model assumptions.
Key words: BL Lacertae objects: general / X / rays: galaxies / BL Lacertae objects: individual: PKS 2005 / 489
© ESO, 2001
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