Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314605p&link_type=abstract
American Astronomical Society Meeting 203, #146.05; Bulletin of the American Astronomical Society, Vol. 36, p.590
Astronomy and Astrophysics
Astronomy
Scientific paper
We have used XMM-Newton to survey the X-ray spectral properties of BL Lacertae objects. Thirteen objects, selected from the Einstein Slew Survey, were observed in relatively short exposures. These short exposures were intended to enable us to both survey the properties of the class as well as pinpoint for deeper study objects with features such as excess absorption and/or emission lines. The spectra of all but two objects are well represented by either a power law with variable absorption, or a logarithmic parabola with fixed (Galactic) absorption. Because objects with repeated observations would require a variable absorbing column, we favor a continuous X-ray spectral curvature. Two objects require both spectral curvature and a small column in excess of Galactic. Surprisingly, we found no examples of "warm absorber" features, contrary to our expectations based on the ASCA and BBXRT observations of the X-ray brightest BL Lacs, PKS2155-304, PKS 0548-322. Such features must be rare, rather than common or ubiquitous as previous studies had speculated. We examine implications for the circumnuclear environments, jets and central engines of BL Lacs
Allen Mark G.
Aller Hugh
Aller Margo
Andersson Kaj
Daugherty Timothy
No associations
LandOfFree
BL Lac X-ray Spectra: Simpler than we thought 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 BL Lac X-ray Spectra: Simpler than we thought, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and BL Lac X-ray Spectra: Simpler than we thought will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1424129