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Gas-rich galaxies and the HI mass function

Davies, Jonathan Ivor, de Blok, W. J. G., Smith, Rodney, Kambas, A., Sabatini, Sabina ORCID:, Linder, Suzanne M. and Salehi-Reyhani, S. A. 2001. Gas-rich galaxies and the HI mass function. Monthly Notices of the Royal Astronomical Society 328 (4) , pp. 1151-1160. 10.1046/j.1365-8711.2001.04938.x

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We have developed an automated cross-correlation technique to detect 21cm emission in sample spectra obtained from the H i Parkes All Sky Survey. The initial sample selection was the nearest spectra to 2435 low-surface-brightness galaxies in the catalogue of Morshidi-Esslinger, Davies and Smith. The galaxies were originally selected to have properties similar to Fornax cluster dE galaxies. As dE galaxies are generally gas poor it is not surprising that there were only 26 secure detections. All of the detected galaxies have very high values of (MH/LB)⊙. Thus the H i selection of faint optical sources leads to the detection of predominately gas-rich galaxies. The gas-rich galaxies tend to reside on the outskirts of the large-scale structure delineated by optically-selected galaxies, but they do appear to be associated with it. These objects appear to have relative dark matter content similar to that of optically-selected galaxies. The H i-column densities are lower than the ‘critical density’ necessary for sustainable star formation and they appear, relatively, rather isolated from companion galaxies. These two factors may explain their high relative gas content. We have considered the H i mass function by looking at the distribution of velocities of H i detections in random spectra on the sky. The inferred H i mass function is steep, though confirmation of this result awaits a detailed study of the noise characteristics of the H i survey.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: techniques: photometric; catalogues; surveys; stars: formation; galaxies: luminosity function, mass function; radio lines: galaxies
Publisher: Wiley
ISSN: 0035-8711
Last Modified: 05 Aug 2023 03:18

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