LEO triplet spiral galaxy NGC 3628. II. VLA observations of the hydroxyl absorption

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165530· OSTI ID:5748081

Schmelz, J T; Baan, W A; Haschick, A D

The VLA-A has been used to observe the hydroxyl absorption against the nuclear continuum region of NGC 3628, an edge-on spiral galaxy in the Leo Triplet. The stronger 1667 MHz component is resolved into eight spatial and velocity features. The weaker 1667 MHz transition is seen in all of these, but three are between 3 and 5 sigma. A rotating molecular disk with a radius of about 168 pc is consistent with the observations and strongly supports the disk interpretation of the H I features presented elsewhere by the authors. Several additional features at lower velocities form a second structure which is expanding away from this disk. A tidal interaction between NGC 3627 and NGC 3628 probably caused the H I extensions called the plume and the bridge and possibly caused the nuclear radio source to turn on. 18 references.

• Research Organization: Pennsylvania State Univ., University Park; Arecibo Observatory, PR; Haystack Observatory, Westford, MA
• OSTI ID: 5748081
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 320; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONFIGURATION
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
FLUX DENSITY
GALAXIES
GALAXY NUCLEI
H1 REGIONS
HYDROXYL RADICALS
MORPHOLOGY
RADIATIONS
RADICALS
RADIOWAVE RADIATION
SPIRAL CONFIGURATION