Absorption in the H(93 95)α and H(78 79)α recombination lines in the HII region of the quasar 3C 345

Astronomy and Astrophysics – Astronomy

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Absorption of the synchrotron emission of the quasar 3C 345 in the continuum and H(93 95)α and H(78 79)α radio recombination lines is studied. The upper limit for absorption in the H(93 95)α lines is T al/T ac < 0.7%; absorption in the H(78 79)α lines with antenna temperature T al = 25 mK, linewidth Δf = 5.3 ± 0.08 MHz, and T al/T ac ≥ 0.3% has been detected. A correction to the redshift Δz = 0.00135 ± 0.00008 (z = 0.59365) has been determined.

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