SIMBAD references

2003MNRAS.343.1195R - Mon. Not. R. Astron. Soc., 343, 1195-1206 (2003/August-3)

The column density distribution function at z = 0 from HI selected galaxies.

RYAN-WEBER E.V., WEBSTER R.L. and STAVELEY-SMITH L.

Abstract (from CDS):

We have measured the column density distribution function, f (N_H i_), at z = 0 using 21-cm Hi emission from galaxies selected from a blind Hi survey. f (N_H i_) is found to be smaller and flatter at z = 0 than indicated by high-redshift measurements of damped Lyman α (DLA) systems, consistent with the predictions of hierarchical galaxy formation. The derived DLA number density per unit redshift, dNDLA/dz = 0.058, is in moderate agreement with values calculated from low-redshift QSO absorption line studies. We use two different methods to determine the types of galaxies which contribute most to the DLA cross-section: comparing the power-law slope of f (N_H i_) to theoretical predictions and analysing contributions to dNDLA/dz. We find that comparison of the power-law slope cannot rule out spiral discs as the dominant galaxy type responsible for DLA systems. Analysis of dNDLA/dz however, is much more discriminating. We find that galaxies with log M_H i_< 9.0 make up 34 per cent of dNDLA/dz; Irregular and Magellanic types contribute 25 per cent; galaxies with surface brightness {formmu11} account for 22 per cent and sub-L*galaxies contribute 45 per cent to dNDLA/dz. We conclude that a large range of galaxy types give rise to DLA systems, not just large spiral galaxies as previously speculated.

Abstract Copyright: 2003 RAS

Journal keyword(s): galaxies: ISM - quasars: absorption lines

Nomenclature: Table A1: HIPASS JHHMM+DD N=35.

Errata: erratum vol. 356, p. 1600 (2005)

Status at CDS:  

Simbad objects: 37

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