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Date and Time of the Query: 2019-06-19 T21:16:34 PDT
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For refcode 2015MNRAS.452.3726H:
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Copyright by Royal Astronomical Society. 2015MNRAS.452.3726H A blind H I mass function from the Arecibo Ultra-Deep Survey (AUDS) Hoppmann, L.; Staveley-Smith, L.; Freudling, W.; Zwaan, M. A.; Minchin, R. F.; Calabretta, M. R. Abstract. The Arecibo Ultra-Deep Survey (AUDS) combines the unique sensitivity of the telescope with the wide field of the Arecibo L-band 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=5.6-10.3. 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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