H I and optical observations of the NGC 428 field.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxies: Individual: Ngc 428 -- Galaxies: Interactions -- Galaxies: Kinematics And Dynamics -- Galaxies: Photometry -- Radio Lines: Galaxies, Spiral Galaxies: H I Observations, Spiral Galaxies: Interacting Galaxies, Spiral Galaxies: Star Formation, Spiral Galaxies: Structure

Scientific paper

The H I and optical properties of the NGC 428 galaxy field are presented. Three galaxies in this system are found to contain H I. The largest of these is NGC 428 which has undergone strong recent star formation in its spiral arms where the H I surface density exceeds ≍8×1020cm-2. To the north of NGC 428 there is a low surface brightness galaxy (0110+008) with μB0 = 25.0 mag arcsec-2 and with a peak H I column density of ≡2×1020cm-2. Additionally there is an H I tail lying to the south of NGC 428 with a peak H I column density of ≡1×1020cm-2 which is connected to NGC 428 and extends to ≡2.5 Holmberg radii. This tail has no associated optical emission to ≡27 μB mag arcsec-2. It is postulated that the low H I surface density of the tail has inhibited star formation. Possible formation scenarios for the H I tail and low surface brightness galaxy 0110+008 are discussed.

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