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7.5. Tentative detection of far infrared excess in Arp 220

Published online by Cambridge University Press:  25 May 2016

Kin-Wing Chan ,
S. H. Moseley ,
E. Dwek ,
T. L. Roellig ,
S. Casey  and
R. Loewenstein
Kin-Wing Chan
Affiliation:
NASA/Ames Research Center, MS 245-6, Moffett Field, CA 94035, USA
S. H. Moseley
Affiliation:
NASA/Goddard Space Flight Center, Code 685, Greenbelt, MD 20771, USA
E. Dwek
Affiliation:
NASA/Goddard Space Flight Center, Code 685, Greenbelt, MD 20771, USA
T. L. Roellig
Affiliation:
NASA/Ames Research Center, MS 245-6, Moffett Field, CA 94035, USA
S. Casey
Affiliation:
Hughes/STX/NASA/Goddard Space Flight Center, Code 685, Greenbelt, MD 20771, USA
R. Loewenstein
Affiliation:
Yerkes Observatory, William Bay, Wisconsin, WI 53191, USA

Abstract

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We report 36 to 50 μm observations of Arp 220 by the Goddard Cryogenic Grating Spectrometer on the Kuiper Airborne Observatory in May 1994. In this measurement, we find the galaxy to be four times brighter than in the measurements of Joy et al. (1986). If both of the observations are correct, this large far infrared luminosity increasing in a short time scale between the two observations suggests that the infrared emission in Arp 220 consists mostly of nonthermal synchrotron radiation which originates from the active nucleus.

Type
Part II. Nuclear Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 301 - 302
Copyright
Copyright © Kluwer 1998