Astron. J., 128, 617-643 (2004/August-0)
The H I kinematics and distribution of four blue compact dwarf galaxies.
THUAN T.X., HIBBARD J.E. and LEVRIER F.
Abstract (from CDS):
We present VLA H I observations of the blue compact dwarf (BCD) galaxies NGC 2366, NGC 4861, VII Zw 403, and Haro 2. These galaxies span a range of BCD morphological types. The cometary-like BCDs NGC 2366 and NGC 4861 have regular rotational kinematics with a V/σ of 8.7 and 6.4, respectively. On the other hand, the velocity fields of the iE BCD VII Zw 403 and of the nE BCD Haro 2 lack regularity, and their rotational motion is around the major, not the minor, axis. The H I distribution is centrally peaked in VII Zw 403 and Haro 2, a general feature of all iE and nE-type BCDs, the most common ones. In contrast, cometary-type BCDs have multiple H I peaks that are scattered over the disk. The active regions of star formation are associated with regions of high H I column densities, with slight displacements between the H I and stellar peaks. NGC 2366 shows many H I minima, resulting from the disruptive influence of massive star formation and supernovae on the interstellar medium (ISM). In NGC 2366 and NGC 4861, there is a tendency for H I gas with a higher velocity dispersion to be associated with regions of lower H I column density. This anticorrelation can be understood in the context of a two-phase model of the ISM. In all BCDs, the radio continuum emission is associated with the star-forming regions and is predominantly thermal in nature. H I clouds with no optical counterparts have been found in the vicinity of NGC 4861 and Haro 2.
Galaxies: Individual: NGC Number: NGC 2366 - Galaxies: Individual: NGC Number: NGC 4861 - Galaxies: Individual: Alphanumeric: VII Zw 403 - Galaxies: Individual: Name: Haro 2 - Galaxies: Kinematics and Dynamics - Galaxies: Starburst
Fig.24: [THL2004b] Haro 2 a (Nos a-d).
HI cloud 'c' in Haro 2 ([H56] 2) is [BBB2004] HI C in SIMBAD.
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