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The Dense Molecular Core of Arp 220

Published online by Cambridge University Press:  03 August 2017

Simon J. E. Radford ,
J. Delannoy ,
D. Downes ,
M. Guélin ,
S. Guilloteau ,
A. Greve ,
R. Lucas ,
D. Morris  and
J. Wink
Simon J. E. Radford
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
J. Delannoy
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
D. Downes
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
M. Guélin
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
S. Guilloteau
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
A. Greve
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
R. Lucas
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
D. Morris
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France
J. Wink
Affiliation:
Institut de Radio Astronomie Millimétrique, Grenoble, France

Abstract

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Using the IRAM interferometer we have mapped HCN(1 → 0), HCO+(1 → 0), and 3.5 mm continuum emission from Arp 220, the prototype infrared ultraluminous galaxy. The extended molecular emission and velocity gradient are aligned with the optical dust lane. The HCN and HCO+ lines are exceptionally strong, suggesting a connection between the dense molecular gas they trace and Arp 220's enhanced infrared emission. The inferred gas density and filling factor imply the nucleus of Arp 220 may be a giant molecular cloud.

Type
IX- Galaxy Nuclei
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 303 - 305
Copyright
Copyright © Kluwer 1991 

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