Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.1205c&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #12.05; Bulletin of the American Astronomical Society, Vol. 27, p.1299
Astronomy and Astrophysics
Astronomy
Scientific paper
The flat spectrum compact radio source PKS 1830-211 has been suggested to be a gravitational lens candidate based on the observed double structure of the source with a separation of 1 arcsec together with an elliptical ring-like structure connecting the two components. The redshifts of the radio source PKS 1830-211 and the lens have yet to be measured since searches in the optical and IR have failed to find a counterpart. We present results from the analysis of an X-ray observation of PKS 1830-211 made with the ROSAT PSPC on 15 September 1993. In particular we investigated various emission and absorption mechanisms to describe the PSPC spectrum of PKS 1830-211. By fitting a simple ``absorbed power law'' to the PSPC pulse height distribution we find a hydrogen column density N_H of 6 x 10(20) atoms cm(-2) , which is in excess of that attributed to our galaxy. A model incorporating an absorbed power law with the hydrogen column density N_H fixed at the galactic value of 2.6 x 10(20) atoms cm(-2) plus an absorption edge also provided an acceptable chi (2) fit to the spectrum with an energy index alpha_E of 1.9 +/- 0.1 and an absorption edge at about 490 eV with an optical depth of 4.5. In both cases the results are suggestive that PKS 1830-211 is indeed extragalactic and strengthen the hypothesis that it is a gravitational lens system. More complex models produced by photoionization codes were used to fit the spectrum of PKS 1830-211 yielding information on the optical depth and the ionization state of the X-ray absorber.
Chartas George
Kollgaard R.
Nousek John
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