The subarcsecond infrared structures at the centers of infrared-luminous galaxies

Details The subarcsecond infrared structures at the centers of infrared-luminous galaxies The subarcsecond infrared structures at the centers of infrared-luminous galaxies

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..478e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 478-486.

Astronomy and Astrophysics

Astronomy

41

Galactic Nuclei, Infrared Astronomy, Infrared Sources (Astronomy), Brightness Distribution, Infrared Astronomy Satellite, Point Spread Functions

Scientific paper

This paper presents 1.6-2.2-micron imaging observations of the centers of nine galaxies with high 60-100-micron luminosities. Eight of the nine galaxies contain central 2.2-micron sources that are larger than the point spread function, which typically had a size (FWHM) of 1.0 arcsec. The typical physical size of the 2.2-micron sources is about 0.5 kpc. One of the galaxies (NGC 6240) contains a double source, with the components having a similar separation (about 1.5 arcsec) and position angle to the radio and optical components. The central regions of six out of the nine galaxies have 2.2-micron surface brightnesses that are equal to or greater than the maximum 2.2-micron central surface brightness of a sample of optically selected galaxies. The H-K colors of the central regions of the infrared-luminous galaxies are about 0.5 mag redder than the colors of the central regions of optically selected galaxies. The result that the nuclear 2.2-micron sources in almost all of the galaxies are extended is evidence that most of the 2.2-micron emission is from sources other than active nuclei.

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