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X-Ray Spectra of BL Lacertae Objects from the ROSAT Archive

Published online by Cambridge University Press:  25 May 2016

G. Lamer ,
H. Brunner  and
R. Staubert
G. Lamer
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie Waldhäuserstr. 64, D-72076 Tübingen
H. Brunner
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie Waldhäuserstr. 64, D-72076 Tübingen
R. Staubert
Affiliation:
Institut für Astronomie und Astrophysik, Abt. Astronomie Waldhäuserstr. 64, D-72076 Tübingen

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Our sample comprises all BL Lac objects listed in the catalogue of Véron-Cetty & Véron (1993) and which are detected in a ROSAT PSPC observation with at least 50 source counts: 74 objects in total. We reduced the data from the ROSAT archives at MPE and GSFC and fitted single power-law models with photoelectric absorption to the spectra. We calculated the broad band spectral indices αrx, αro, and αox from the ROSAT 1 keV fluxes, 5 GHz radio, and optical V band fluxes (Véron-Cetty & Véron 1993).

Type
Relation between Radio and Other Wavelenghts
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 265 - 266
Copyright
Copyright © Kluwer 1996 

References

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