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Title:
Near-infrared light and the morphology of ARP 220
Authors:
Smith, J.; Grasdalen, G. L.; Gehrz, R. D.; Hackwell, John A.; Dietz, R. D.
Affiliation:
AA(Wyoming Infrared Observatory, Laramie), AB(Wyoming Infrared Observatory, Laramie), AC(Minnesota, University, Minneapolis), AD(Aerospace Corp., Space Sciences Laboratory, Los Angeles, CA), AE(Northern Colorado, University, Greeley, CO)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 107-115. Research supported by the University of Minnesota, USAF, NSF, and NASA. (ApJ Homepage)
Publication Date:
06/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GALACTIC STRUCTURE, INFRARED SOURCES (ASTRONOMY), MORPHOLOGY, NEAR INFRARED RADIATION, RADIO EMISSION, STAR FORMATION, COSMIC DUST, ENERGY DISTRIBUTION, LINE OF SIGHT, STELLAR LUMINOSITY
DOI:
10.1086/166361
Bibliographic Code:
1988ApJ...329..107S

Abstract

The authors present 2.2 μm imaging and a near-infrared energy distribution for the luminous galaxy Arp 220. The image reveals a 40arcsec (20 kpc) diameter source of extended emission centered symmetrically on a single bright peak. This near-infrared peak coincides probably the dynamical center of the galaxy. A luminosity of 1×1010L_sun; at near-infrared wavelengths is derived for the central 40arcsec of Arp 220. The observed near-infrared values of size and luminosity are common to normal giant galaxies. No infrared evidence is found for interacting galaxies. No single component morphology, spheroidal or disk, describes Arp 220 adequately. The authors explain it as a hybrid galaxy form, consisting of an active giant elliptical galaxy with an extensive disk of interstellar matter oriented edge-on to the observed line of sight and centered on the galaxy's nucleus. Arp 220 is compared with five familiar radio galaxies having bright dust emission.

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