Infrared spectroscopy of a Cygnus A - Implications for the obscured active nucleus

Details Infrared spectroscopy of a Cygnus A - Implications for the obscured active nucleus Infrared spectroscopy of a Cygnus A - Implications for the obscured active nucleus

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..115w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 115-120. Research supported by MOESC and DSS.

Astronomy and Astrophysics

Astrophysics

59

Active Galactic Nuclei, Infrared Spectroscopy, Quasars, Radio Galaxies, Seyfert Galaxies, Astronomical Spectroscopy, Cygnus Constellation, Interstellar Matter, Spectral Line Width, X Ray Spectra

Scientific paper

Near-infrared spectroscopic observations of the central regions of the luminous radio galaxy Cygnus A are presented and interpreted in terms of an obscured quasar nucleus. Strong emission is detected in the molecular hydrogen lines 1-0 S(1) and 1-0 S(3), the strengths of which are accounted for through heating by the nuclear hard X-ray source. The large equivalent widths of these molecular hydrogen lines and the near-infrared narrow hydrogen recombination lines suggest that the observed nuclear continuum is strongly attenuated at 2 microns. The observed upper limit to the flux of broad Pa-alpha implies an extinction to the putative broad line region AV(BL) of at least 24 mag, and the observed continuum intensity of the nuclear point source at 2.2 microns gives an extinction of 43 +/-9 mag toward the optical-infrared continuum. These estimates are consistent with the gas column density inferred from the low-energy X-ray cutoff. Strong forbidden Si VI 1.962-micron line emission from Cygnus A is also reported.

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