A Spectral Study of Four X-Ray--selected BL Lacertae Objects with EXOSAT
Abstract
We present new EXOSAT spectral results for four X-ray-selected BL Lac objects (H0323+022, H0414+009, H1426+428, and H1722+ 119). The data were retrieved from the EXOSAT data base. A spectral analysis was performed on the overall low-energy plus medium-energy distributions, which were modeled with a single, absorbed power law. In one case (H1426+428), an indication of a spectral break at ~5 keV is found. For H0323 + 022 and H0414 + 428, for which more than one observation is available, the spectral index is found to vary with intensity, in the sense of a hardening of the spectrum when the source brightens.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1993
- DOI:
- 10.1086/172602
- Bibcode:
- 1993ApJ...408..452S
- Keywords:
-
- Bl Lacertae Objects;
- Exosat Satellite;
- X Ray Spectra;
- Active Galactic Nuclei;
- Spectral Energy Distribution;
- Spectrum Analysis;
- Astronomy;
- GALAXIES: BL LACERTAE OBJECTS: GENERAL;
- X-RAYS: GALAXIES