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J/A+A/311/384 ROSAT observations of BL Lacertae objects (lamer+ 1996)
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ROSAT observations of BL Lacertae objects.
Lamer G., Brunner H., Staubert R.
<Astron. Astrophys. 311, 384 (1996)>
=1996A&A...311..384L (SIMBAD/NED BibCode)
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ADC_Keywords: BL Lac objects ; X-ray sources
Mission_Name: ROSAT
Keywords: galaxies: active - BL Lacertae objects: general -
radio continuum: galaxies - X-rays: galaxies
Description:
We present soft X-ray spectra of 74 BL Lacertae objects observed with
the PSPC detector on board of the ROSAT satellite. The sample contains
all BL Lac objects detected during the pointed observation phase as a
target or serendipitously. We have investigated the soft X-ray and
broad band spectral properties and discuss the consequences for the
X-ray emission processes. For the first time a clear dependence of the
X-ray spectral steepness on the radio to X-ray spectral energy
distribution is found: alpha_rx_ and alpha_x_ are correlated in
the X-ray selected (XBL) subsample and anticorrelated in the radio
selected (RBL) subsample. The objects with intermediate alpha_rx_
values thus do have the steepest soft X-ray spectra. Simulated PSPC
spectra based on a set of simple two component multifrequency spectra
are in good agreement with the measurements and suggest a broad range
of synchrotron cutoff energies. We have calculated synchrotron
self-Compton beaming factors for a subsample of radio bright objects
and find a correlation of the beaming factors delta_IC_ with
alpha_rx_ and alpha_x_. The most extreme RBL objects are very
similar to flat spectrum radio quasars in all their broad band and
X-ray properties.