The Bluedisks project, a study of unusually H I-rich galaxies - I. H I sizes and morphology

Jing Wang*, Guinevere Kauffmann, Gyula I. G. Jozsa, Paolo Serra, Thijs van der Hulst, Frank Bigiel, Jarle Brinchmann, M. A. W. Verheijen, Tom Oosterloo, Enci Wang, Cheng Li, Milan den Heijer, Juergen Kerp

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

57 Citaten (Scopus)
203 Downloads (Pure)

Samenvatting

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-circle dot and radii R1 of similar to 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.

Originele taal-2English
Pagina's (van-tot)270-294
Aantal pagina's25
TijdschriftMonthly Notices of the Royal Astronomical Society
Volume433
Nummer van het tijdschrift1
DOI's
StatusPublished - 21-jul-2013

Citeer dit