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Title:
H I and CO in Blue Compact Dwarf Galaxies: Haro 2 and Haro 4
Authors:
Bravo-Alfaro, H.; Brinks, E.; Baker, A. J.; Walter, F.; Kunth, D.
Affiliation:
AA(Departamento de Astronomía, Universidad de Guanajuato, Apdo. Postal 144, Guanajuato 36000, Mexico), AB(Instituto Nacional de Astrofísica, Optica y Electrónica, Apdo. Postal 51 and 216, Puebla 72000, Mexico), AC(Owens Valley Radio Observatory, MS 105-24, California Institute of Technology, Pasadena, CA 91125), AD(National Radio Astronomy Observatory, P.O. Box O, Socorro, NM 87801), AE(Institut d'Astrophysique, 98bis Boulevard Arago, F-75014 Paris, France)
Publication:
The Astronomical Journal, Volume 127, Issue 1, pp. 264-278. (AJ Homepage)
Publication Date:
01/2004
Origin:
UCP
AJ Keywords:
Galaxies: Dwarf, Galaxies: Individual: Name: Haro 2, galaxies: individual (Haro 4), galaxies: individual (Haro 26), radio lines: galaxies
DOI:
10.1086/379956
Bibliographic Code:
2004AJ....127..264B

Abstract

We present Very Large Array H I imaging of two blue compact dwarf galaxies, Haro 2 and Haro 4, and of the spiral galaxy Haro 26, which is projected some 22' southwest of Haro 4. We also show a map of the CO(1-0) distribution of Haro 2 obtained with the Owens Valley Radio Observatory Millimeter Array, as well as derive an upper limit for CO(2-1) emission from Haro 4 obtained with the Caltech Submillimeter Observatory. The H I data of Haro 2 reveal that the kinematical major axis lies perpendicular to the photometric major axis, indicating that the atomic hydrogen rotates about the major axis of the galaxy. This confirms earlier indications based on CCD photometry that Haro 2 is a dust-lane dE rather than a dIrr. We propose that the present neutral and molecular ISM configuration is due to recent gas accretion or a merger. The H I distribution and dynamics of Haro 4 and the neighboring spiral Haro 26 suggest that they are currently undergoing a tidal interaction, reinforcing the notion that interactions play an important role in triggering the star formation witnessed in blue compact galaxies.
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