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

  • G. Lamer (a1), H. Brunner (a1) and R. Staubert (a1)

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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).

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References

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Gelotti, A., Maraschi, L., Ghisellini, G., Caccianiga, A., and Maccacaro, T., 1993, ApJ , 416, 118
Ghisellini, G. and Maraschi, L., 1989, ApJ , 340, 181
Lamer, G., Brunner, H., Staubert, R., 1995, A&A , submitted
Morris, S.L., Stocke, J.T., Gioia, I.M., et al. 1991, ApJ , 380, 49
Padovani, P., and Giommi, P., 1995, ApJ , 444, 567
Vearon-Cetty, M.P., and Vearon, P., 1993, ESO Scientific Report, 13

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

  • G. Lamer (a1), H. Brunner (a1) and R. Staubert (a1)

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