Journal Article

Neutral hydrogen absorption observations of the central region of NGC 3628

G. H. J. Cole, C. G. Mundell and A. Pedlar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 300, issue 3, pages 656-664
Published in print November 1998 | ISSN: 0035-8711
Published online November 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.t01-1-01870.x
Neutral hydrogen absorption observations of the central region of NGC 3628

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Abstract

Using MERLIN with 0.2-arcsec resolution we have observed neutral hydrogen absorption against the central region of the starburst galaxy NGC 3628. The central region resolves into ∼16 continuum components at 1.4 GHz. From comparison with published 15-GHz data, we infer that these components are supernova remnants, although three components may be consistent with a weak active galactic nucleus. Neutral hydrogen absorption is seen against the continuum emission with column densities ∼1022 cm−2. The absorption appears to be from two separate absorbing structures. Assuming a simple morphology, the main velocity structure can be attributed to a ring of neutral gas with a radius 130 pc rotating around a central starburst with a velocity gradient of 1270 km s−1 kpc−1. From simple assumptions, the mass interior to this ring is 0.9 × 109 M. The second absorption structure may represent outflow from the starburst region or a large-scale galactic structure. Alternatively the absorption structure may be non-axisymmetric, such as a bar.

Keywords: supernova remnants; galaxies: individual: NGC 3628; galaxies: ISM; galaxies: starburst; radio lines: galaxies

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Subjects: Astronomy and Astrophysics

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