Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274...79j&link_type=abstract
Astronomy and Astrophysics, Vol. 274, NO. 1/JUL(I), P. 79, 1993
Astronomy and Astrophysics
Astrophysics
12
Scientific paper
We present the results of new ROSAT observations of four quasars. Two radio-loud objects, 3C 110 and 3C 334, and the radio-quiet quasar, Mkn 877, have relatively soft X-ray spectra (α_X_~ 1.2), whereas a third radio-loud object, PKS 0403-132, has a canonical X-ray continuum slope (α_X_~ 0.7). The latter source has the most core- dominated radio structure of the sample consistent with the previously established correlation of X-ray spectral hardness with radio core- dominance in quasars, which has been interpreted in terms of the relativistic beaming of a relatively hard X-ray spectral component. However, ROSAT observations in the 0.1 - 2 keV band are generally indicating much softer X-ray spectra than were measured previously with the Einstein observatory in the 0.3 - 3.5 keV band for all classes of quasar including those with core-dominated radio structure. We argue that this is quite difficult to explain in terms of models which envisage a mixture of beamed and unbeamed X-ray components. We also report new measurements of the galactic neutral hydrogen column density in the direction of 49 radio loud quasars.
Browne Ian W. A.
Jackson Neal
Warwick Robert S.
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