Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-13
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A (6 pages, 3 figures)
Scientific paper
10.1051/0004-6361:20066063
We present the results of a spectral analysis of 5 Swift XRT and UVOT observations of the BL Lac object PKS 0548-322 carried out over the period April-June 2005. The X-ray flux of this high energy peaked BL Lac (HBL) source was found to be approximately constant at a level of F(2-10 keV) ~ 4x10^-11 erg cm^-2 s^-1, a factor of 2 brighter than when observed by BeppoSAX in 1999 and close to the maximum intensity reported in the Einstein Slew Survey. The very good statistics obtained in the 0.3-10 keV Swift X-ray spectrum allowed us to detect highly significant deviations from a simple power law spectral distribution. A log-parabolic model describes well the X-ray data and gives a best fit curvature parameter of 0.18 and peak energy in the Spectral Energy Distribution of about 2 keV. The UV spectral data from Swift UVOT join well with a power law extrapolation of the soft X-ray data points suggesting that the same component is responsible for the observed emission in the two bands. The combination of synchrotron peak in the X-ray band and high intensity state confirms PKS 0548-322 as a prime target for TeV observations. X-ray monitoring and coordinated TeV campaigns are highly advisable.
Berk Daniel Vanden
Burrows David N.
Capalbi Milvia
Chincarini Guido
Cusumano Giancarlo
No associations
LandOfFree
Swift XRT and UVOT deep observations of the high energy peaked BL Lac object PKS 0548-322 close to its brightest state does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Swift XRT and UVOT deep observations of the high energy peaked BL Lac object PKS 0548-322 close to its brightest state, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Swift XRT and UVOT deep observations of the high energy peaked BL Lac object PKS 0548-322 close to its brightest state will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-664203