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

Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X, Becklin, E. E., Hodapp, K. W., Simons, D. A. and Wynn-Williams, C. G. 1990. The subarcsecond infrared structures at the centers of infrared-luminous galaxies. Astrophysical Journal 365 , pp. 478-486. 10.1086/169502

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Abstract

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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	galactic nuclei; infrared astronomy; infrared sources (astronomy); brightness distribution; infrared astronomy satellite; point spread functions
Publisher:	IOP Science
ISSN:	0004-637X
Last Modified:	24 Oct 2022 11:19
URI:	https://orca.cardiff.ac.uk/id/eprint/47705

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