The asymmetric CO distribution in the Virgo Cluster spiral NGC 4419

Details The asymmetric CO distribution in the Virgo Cluster spiral NGC 4419 The asymmetric CO distribution in the Virgo Cluster spiral NGC 4419

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..460k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 460-468.

Astronomy and Astrophysics

Astrophysics

15

Carbon Monoxide, High Energy Interactions, Mass Distribution, Spiral Galaxies, Virgo Galactic Cluster, Emission Spectra, H I Regions, Interstellar Gas

Scientific paper

New high-resolution CO (J = 1 approaches 0) observations of the H I-deficient Virgo Cluster Sa galaxy NGC 4419 are presented. Single-dish spectra with 17-arcsec resolution obtained with the Nobeyama Radio Observatory 45 m telescope reveal that the CO emission in the outer disk is significantly asymmetric. Outside of the central kiloparsec, there is 3-4 times more molecular gas on the northwest side of the galaxy than on the southeast side. Aperture synthesis data of the CO emission at 8 x 6 arcsec resolution of NGC 4419 obtained with the Owens Valley Radio Observatory millimeter-wave interferometer shows two significant asymmetries of a smaller magnitude within the central kiloparsec. Emission is detected further from the nucleus to the northwest, consistent with the large-scale asymmetry, but peaks in the southeast are the strongest, as if the gas were compressed. NGC 4419 also has an unusually high global CO/H I flux ratio, indicating that it has 10-15 times more molecular gas than atomic gas. The asymmetry in the CO distribution and the large CO/H I ratio suggest that the interstellar medium (ISM) of NGC 4419 is undergoing a strong interaction with the gas in the intracluster medium (ICM)

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