The near-infrared continua of emission-line galaxies

Details The near-infrared continua of emission-line galaxies The near-infrared continua of emission-line galaxies

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207..367a&link_type=abstract

Astrophysical Journal, vol. 207, July 15, 1976, pt. 1, p. 367-375.

Astronomy and Astrophysics

Astronomy

74

Continuous Spectra, Emission Spectra, Galactic Radiation, Infrared Astronomy, Near Infrared Radiation, Astronomical Photometry, Color, Extragalactic Radio Sources, Radio Sources (Astronomy), Seyfert Galaxies

Scientific paper

Accurate near-infrared photometry of a selection of extragalactic emission-line objects shows an excess infrared continuum to be present in radio galaxies and to be most pronounced in Seyfert galaxies. The excess is mostly restricted to the more luminous objects. It is difficult to explain the observed colors by synchrotron radiation; in Markarian 171, the infrared continuum can be produced only by thermal radiation from dust. A likely correlation between optical spectrum and infrared excess is violated by Markarian 509, the spectrum of which is described.

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