2007A&A...462..889P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST15:55:30

2007A&A...462..889P - Astronomy and Astrophysics, volume 462, 889-893 (2007/2-2)

Swift XRT and UVOT deep observations of the high-energy peaked BL Lacertae object PKS 0548-322 close to its brightest state.

PERRI M., MASELLI A., GIOMMI P., MASSARO E., NESCI R., TRAMACERE A., CAPALBI M., CUSUMANO G., CHINCARINI G., TAGLIAFERRI G., BURROWS D.N., BERK D.V., GEHRELS N. and SAMBRUNA R.M.

Abstract (from CDS):

We observed the high-energy peaked BL Lac object PKS 0548-322 (BZB J0550-3216) with Swift to study the temporal and spectral properties of its synchrotron emission simultaneously in the optical, ultraviolet, and X-ray energy bands. We carried out a spectral analysis of 5 Swift XRT and UVOT observations of PKS 0548-322 taken over the period April-June 2005. The X-ray flux of this BL Lac source was found to be approximately constant at a level of F(2–10keV)≃4x10–11erg/cm2/s which is 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 0.3-10keV Swift X-ray spectrum allowed us to detect highly significant deviations from a simple power-law spectral distribution. A log-parabolic model describes the X-ray data well and gives a best-fit curvature parameter of 0.18 and a peak energy in the spectral energy distribution of about 2keV. The UV spectral data from Swift UVOT join closely 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 the high-intensity state confirms PKS 0548-322 as a prime target for TeV observations. X-ray monitoring and coordinated TeV campaigns are highly advisable.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - galaxies: BL Lacertae objects: individual: PKS 0548-322 - X-rays: galaxies

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 358 1
2 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2330 1
3 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1876 2

    Equat.    Gal    SGal    Ecl

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2019.10.21-15:55:30

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