NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T06:05:21 PDT
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For refcode 2013MNRAS.433..270W:
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Copyright by Royal Astronomical Society. 2013MNRAS.433..270W The Bluedisks project, a study of unusually H I-rich galaxies - I. H I sizes and morphology Wang, Jing; Kauffmann, Guinevere; Jozsa, Gyula I. G.; Serra, Paolo; van der Hulst, Thijs; Bigiel, Frank; Brinchmann, Jarle; Verheijen, M. A. W.; Oosterloo, Tom; Wang, Enci; Li, Cheng; den Heijer, Milan; Kerp, Jurgen Abstract. We introduce the 'Bluedisk' project, a large programme at the Westerbork Synthesis Radio Telescope that has mapped the H I in a sample of 23 nearby galaxies with unusually high H I mass fractions, along with a similar-sized sample of control galaxies. This paper presents the sample selection, observational set-up, data reduction strategy and a first analysis of the sizes and structural properties of the H I discs. We find that the H I-rich galaxies lie on the same H I mass versus H I size relation as normal spiral galaxies, extending it to total H I masses of 2 x 10^10^ M_sun_ and radii R1 of ~100 kpc. The H I-rich galaxies have significantly larger values of H I-to-optical size ratio and more clumpy H I discs than those of normal spirals. There is no evidence that the discs of H I-rich galaxies are more disturbed. In fact, the centre of the H I distribution corresponds more closely with the centre of the optical light in the H I-rich galaxies than in the controls. All these results argue against a scenario in which new gas has been brought in by mergers. It is possible that they may be more consistent with cooling from a surrounding quasi-static halo of warm/hot gas. Key words: galaxies: evolution, galaxies: ISM, galaxies: spiral
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