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CO Emission from the Infrared Galaxy NGC4418

Published online by Cambridge University Press:  03 August 2017

Kimiaki Kawara ,
Yoshiaki Taniguchi ,
Naomasa Nakai  and
Yoshiaki Sofue
Kimiaki Kawara
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181
Yoshiaki Taniguchi
Affiliation:
Kiso Observatory, Institute of Astronomy, The University of Tokyo, Mitake, Kiso, Nagano 397-01, Japan
Naomasa Nakai
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano 384-13, Japan
Yoshiaki Sofue
Affiliation:
Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo 181

Extract

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12CO (J=1−0) emission has been detected in the extremely extinguished galaxy NGC4418 with a 15″ beam on the 45-m telescope at the Nobeyama Radio Observatory. The inferred molecular mass is 4 108 MO at a distance of 25 Mpc. The CO line profile is single peaked with the FWHM of 85 km/s, suggesting that molecular clouds highly concentrate towards the center. For the column density estimated from these observations to be consistent with the extinction value 55 < Av < 120 derived from the 10μm silicate absorption by Roche et al (1986), most of the clouds should be confined within a central region of 3.8″ (500pc) in diameter, through which beam Roche et al detected the 10 and 20μm fluxes comparable to the IRAS ones.

Type
XIII- IRAS Ultraluminous Objects and Quasars
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 450
Copyright
Copyright © Kluwer 1991