For refcode 2015MNRAS.452.3726H: Retrieve 101 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by Royal Astronomical Society.
2015MNRAS.452.3726H
A blind H I mass function from the Arecibo UltraDeep Survey (AUDS)
Hoppmann, L.; StaveleySmith, L.; Freudling, W.; Zwaan, M. A.; Minchin, R.
F.; Calabretta, M. R.
Abstract. The Arecibo UltraDeep Survey (AUDS) combines the unique
sensitivity of the telescope with the wide field of the Arecibo Lband
Feed Array (ALFA) to directly detect 21 cm H I emission from galaxies at
distances beyond the local Universe bounded by the lower frequency limit
of ALFA (z = 0.16). AUDS has collected 700 h of integration time in two
fields with a combined area of 1.35 deg^2^. In this paper, we present data
from 60 per cent of the total survey, corresponding to a sensitivity level
of 80 muJy. We discuss the data reduction, the search for galaxies,
parametrization, optical identification and completeness. We detect 102
galaxies in the mass range of log (M_{H I}_/M)2log h=5.610.3. We compute
the H I mass function (HIMF) at the highest redshifts so far measured. A
fit of a Schechter function results in {alpha} =  1.37 +/ 0.03, Phi* =
(7.72 +/ 1.4) x 10^3^ h^3^ Mpc^3^ and log (M_{H
I}_^{*}/M_{sun}_)=({9.75+/ 0.041})+2 log h. Using the measured HIMF, we
find a cosmic H I density of Omega_{H I}_=({2.33+/ 0.07})x 10^{4} h^{1}
for the sample (z = 0.065). We discuss further uncertainties arising from
cosmic variance. Because of its depth, AUDS is the first survey that can
determine parameters for the HIMF in independent redshift bins from a
single homogeneous data set. The results indicate little evolution of the
comoving mass function and Omega_{H I}_ within this redshift range. We
calculate a weighted average for Omega_{H I}_ in the range 0 < z < 0.2,
combining the results from AUDS as well as results from other 21 cm
surveys and stacking, finding a best combined estimate of Omega_{H
I}_=(2.63+/ 0.10)x 10^{4} h^{1}.
Key words: galaxies: evolution, galaxies: ISM, galaxies: luminosity
function, mass function, radio lines: galaxies
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