Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..102b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 102-111.
Astronomy and Astrophysics
Astronomy
40
Astronomical Spectroscopy, Disk Galaxies, Galactic Structure, Hydrogen Ions, Neutral Gases, Peculiar Galaxies, Radio Sources (Astronomy), Centimeter Waves, Galactic Nuclei, Hydroxyl Emission, Radial Velocity
Scientific paper
The nuclear H I absorption of IC 4553 (Arp 220) was scanned with the 30 km VLA-A array and a search was made for extended H I emission with the 3 km VLA-C array. The observations were made at 6.26 MHz on different dates in 1982-1984. No extended H I emission was detected at levels above 1 mJy per beam scales from 1-20 arcsec with the A array and from 30 arcsec-4 arcmin with the C configuration. The nuclear H I disk coincided with a previously mapped OH emitting disk, but had a center velocity 77 km/sec higher. The H I disk is about 1.5 kpc across, is contained within the OH disk, is noncircular in shape, and has a mass of about 400 million solar masses. Reasons for the lack of an extended H I feature are discussed.
Baan Willem A.
Mirabel Felix I.
Schmelz Joan T.
van Gorkom Jacqueline H.
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