Other
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439...80c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 439, no. 1, p. 80-89
Other
27
Bl Lacertae Objects, Radio Spectra, Spectral Correlation, Variability, X Ray Spectra, Astronomical Catalogs, Data Correlation, Flux Density, Luminosity, Spectrum Analysis
Scientific paper
We present results from an analysis of 311 X-ray spectra of 42 BL Lac objects recently published in a catalog. We have studied the mean spectrum of both X-ray and radio selected BL Lac objects (XBLs and RBLs, respectively) in two energy bands (soft and medium energies) and compare our results with those obtained by a similar analysis of spectral data of other classes of active galaxies. X-ray selected objects are characterized by an average slope of 2.23 +/- 0.17 and 2.55 +/- 0.30 at soft and medium energies, respectively; the observed dispersion is consistent with being entirely due to spectral changes. For radio selected objects we obtain a slope of 2.52 +/- 0.73 in the soft band and of 2.03 +/- 0.22 in the medium band; in this case, our data are insufficient to determine whether the dispersion is due to spectral variability only. There are strong indications in our analysis that XBLs and RBLs have different spectra: while XBLs are characterized by a convex spectrum (the spectrum steepens at higher frequencies), RBLs show instead a concave shape (the spectrum flattens at higher energies). Finally, there seems to be a trend of increasing photon index value from radio-loud QSOs, Seyfert galaxies, radio-quiet QSOs, and BL Lac objects.
Bassani Loredana
Caroli Ezio
Ciliegi Paolo
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