Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-03-03
Astronomy and Astrophysics
Astrophysics
To appear in the ApJ Vol. 484, July 20, 1997. LaTex, 15 pages. Requires AAS macros
Scientific paper
10.1086/304327
PKS1830-211 is an unusually radio-loud gravitationally lensed quasar. In the radio, the system appears as two compact, dominant features surrounded by relatively extended radio emission which forms an Einstein Ring. As the line of sight to it passes close to our Galactic center, PKS1830-211 has not been detected in wave-bands other than the radio and X-ray so far. Here we present X-ray data of PKS1830-211 observed with ROSAT PSPC. The X-ray spectrum shows that absorption in excess of the Galactic contribution is highly likely, which at the redshift of the lensing galaxy ($z_l=0.886$) corresponds to N$_H=3.5^{+0.6}_{-0.5}\times 10^{22}$ atoms cm$^{-2}$. The effective optical extinction is large, A$_V$(observed)\gax5.8. When corrected for this additional extinction, the two point optical to X-ray slope \aox\ of PKS1830-211 lies just within the observed range of quasars. It is argued here that both compact images must be covered by the X-ray absorber(s) which we infer to be the lensing galaxy(galaxies). The dust to gas ratio along the line of sight within the lensing galaxy is likely to be somewhat larger than for our Galaxy.
Mathur Smita
Nair Sunita
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