The reddening of Cygnus A from a measurement of Paschen-Alpha

Details The reddening of Cygnus A from a measurement of Paschen-Alpha The reddening of Cygnus A from a measurement of Paschen-Alpha

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315l.103l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 315, April 15, 1987, p. L103-L106.

Astronomy and Astrophysics

Astronomy

11

Cygnus Constellation, Emission Spectra, H Alpha Line, H Beta Line, Line Spectra, Paschen Series, Cosmic Dust, Energy Distribution, Galactic Nuclei, Interstellar Matter, Quasars, Radio Sources (Astronomy)

Scientific paper

New observations of the strength of Paα, Hα, and Hβ lines in Cygnus A are used to determine the reddening to the narrow emission-line region in this galaxy. The observed Paα:Hα:Hβ ratios are well fitted by a pure Menzel-Baker case B spectrum with E(B-V) = 0.85±0.1. There is no evidence for significant collisional excitation of Hα and no evidence for an obscured broad-line component at Paα.

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