
TY  - JOUR
A1  - Woltjer, L. 
A1  - Risaliti, G. 
A1  - Salvati, M. 
T1  - Beppo SAX X-Ray Observations of PKS 1934&#8211;63 and S5 1946+708
JF  - Publications of the Astronomical Society of Australia
JO  - Publ. Astron. Soc.  Aust.
Y1  - 2003
VL  - 20
IS  - 1
SP  - 156
EP  - 156
KW  - 
UR  - https://doi.org/10.1071/ASV20N1_ABS 
N2  - X-ray observations of PKS 1934&#8211;63 and S5 1946+708 have been made with Beppo SAX lasting 100 and 40 ksec, respectively. Both sources were detected, and in both there is evidence (at 90&#37; confidence) of a strong iron K&#945; line which would indicate that the nuclei are surrounded by Compton thick material (&#126;1 g cm&#8211;2).For 1946+708 VLBI H I absorption data are available from the literature. With the condition that free&#8211;free absorption should be modest for the source to be observable a minimum radius of around 20 pc is derived for the absorbing torus. The torus is predominantly molecular with a density of 108 cm&#8211;3. The corresponding pressure is rather high. Observations with XMM have been requested to verify the large equivalent width of K&#945; with a better confidence level.In 1934&#8211;63 no important H I absorption was previously detected and no nucleus has been seen in radio data at 8 GHz. If this is due to free&#8211;free absorption a molecular torus with a radius less than 5 pc could be responsible. The density would be 108 cm&#8211;3 or more. The relatively low S/N ratio of our observations does not allow a fully convincing conclusion to be reached. But our discussion shows that the combination of X-ray and high resolution 21-cm absorption data can provide important information on the physical parameters in the absorbing &#8216;torus&#8217;. Paper to appear in full in Astronomy and Astrophysics. 
ER  -

