Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..413m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, Feb. 1992, p. 413-421. Research supported by NSF and NASA.
Astronomy and Astrophysics
Astronomy
22
Active Galactic Nuclei, Color Infrared Photography, Interacting Galaxies, Near Infrared Radiation, Starburst Galaxies, Infrared Signatures, Interstellar Masers, Quasars
Scientific paper
Near-infrared images (1.3-3.7 microns) are presented for the nuclear region of Arp 220. Color maps in J - H and H - K reveal steep gradients, and the two nuclei previously detected at 20 cm and 2.2 microns appear on the J - H image as peaks separated by 1 arcsec. Hot dust emission (T about 1000 K) at 3.7 microns and extremely red J - H and H - K colors are found for both nuclei. The increasingly red color approaching the center of the galaxy are explained most naturally by a mixture of extinction and emission by increasing amounts of hot dust. The near-infrared emission is consistent with a circumnuclear starburst extending to a radius of about 1.5 kpc from the nuclei; further from the center the colors are consistent with a normal late-type stellar population. Inside a radius of 1 kpc the color maps show a NE-SW elongation that aligns with the concentration of molecular gas seen in CO images. The observed 3.7-micron luminosity, when corrected for nuclear extinction determined by 10-micron silicate absorption measurements and normalized by the bolometric luminosity, is consistent with UV-excess quasars and is about 10 times greater than that found in infrared luminous starburst galaxies.
Graham James R.
Hafer C. I.
Matthews Keith
Mazzarella Joseph M.
Neugebauer Gernot
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