Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229...88g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 88-92.
Astronomy and Astrophysics
Astronomy
16
Bl Lacertae Objects, X Ray Spectra, Astronomical Spectroscopy, Emission Spectra, Energy Spectra, Exosat Satellite, Sky Surveys (Astronomy), X Ray Sources
Scientific paper
The results of an analysis of twin Exosat observations of three BL Lac objects, namely PKS 0521-365, PKS 0548-322, and I Zw 186 are presented. The energy spectra between 0.02 and 7 keV can generally be described by power laws with a low energy cut off due to absorption by hydrogen in the galaxy. However, while PKS 0521-365 has a spectrum with an energy slope of 0.6 like many QSOs, the other two BL Lacs have steeper spectra. Furthermore, the energy spectrum of PKS 0548-322 is better represented by a double power law with a steeper spectrum beyond a break occurring around 2-3 keV, and I Zw 186 shows a harder spectrum when the source is slightly brighter. At least in these last two cases, the X-ray spectral region proves to be of great interest because of the presence of features and of their variability with source intensity.
Garilli Bianca
Maccagni Dario
No associations
LandOfFree
X-ray spectra of three BL Lac objects 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 X-ray spectra of three BL Lac objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray spectra of three BL Lac objects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1884704