2013

Detection of HI in distant galaxies using spectral stacking

Delhaize, Jacinta, Meyer, Martin, Staveley-Smith, Lister et al.

Understand

Using the Parkes radio telescope, we study the 21cm neutral hydrogen (HI) properties of a sample of galaxies with redshifts z<0.13 extracted from the optical 2dF Galaxy Redshift Survey (2dFGRS).

Galaxies at 0.04<z<0.13 are studied using new Parkes observations of a 42deg^2 field near the South Galactic Pole (SGP).
A spectral stacking analysis of the 3,277 2dFGRS objects within this field results in a convincing 12sigma detection.
For the low-redshift sample at 0<z<0.04, we use the 15,093 2dFGRS galaxies observed by the HI Parkes All-Sky Survey (HIPASS) and find a 31sigma stacked detection.

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