A blind HI mass function from the arecibo ultra-deep survey (AUDS)

Laura Hoppmann, Lister Staveley-Smith, W. Freudling, M.A. Zwaan, R.F. Minchin, M.R. Calabretta

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    Abstract

    © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 HI 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 deg2. In this paper, we present data from 60 per cent of the total survey, corresponding to a sensitivity level of 80 μJy. We discuss the data reduction, the search for galaxies, parametrization, optical identification and completeness. We detect 102 galaxies in the mass range of log (MHI/M)-2 log h = 5.6-10.3. We compute the HI mass function (HIMF) at the highest redshifts so far measured. A fit of a Schechter function results in α =-1.37 ± 0.03, ϕ* = (7.72 ± 1.4) × 10-3 h3 Mpc-3 and log (M*HI/M) = (9.75 ± 0.041) + 2 log h. Using the measured HIMF, we find a cosmic HI density of ΩHI = (2.33 ± 0.07) × 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 ΩHI within this redshift range. We calculate a weighted average for ΩHI in the range 0HI = (2.63 ± 0.10) × 10-4 h-1.
    Original languageEnglish
    Pages (from-to)3726-3741
    JournalMonthly Notices of the Royal Astronomical Society
    Volume452
    Issue number4
    DOIs
    Publication statusPublished - 2015

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    ultrahigh frequencies
    galaxies
    sensitivity
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    completeness
    universe
    telescopes
    low frequencies
    parameter

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    Hoppmann, Laura ; Staveley-Smith, Lister ; Freudling, W. ; Zwaan, M.A. ; Minchin, R.F. ; Calabretta, M.R. / A blind HI mass function from the arecibo ultra-deep survey (AUDS). In: Monthly Notices of the Royal Astronomical Society. 2015 ; Vol. 452, No. 4. pp. 3726-3741.
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    abstract = "{\circledC} 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 HI 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 deg2. In this paper, we present data from 60 per cent of the total survey, corresponding to a sensitivity level of 80 μJy. We discuss the data reduction, the search for galaxies, parametrization, optical identification and completeness. We detect 102 galaxies in the mass range of log (MHI/M)-2 log h = 5.6-10.3. We compute the HI mass function (HIMF) at the highest redshifts so far measured. A fit of a Schechter function results in α =-1.37 ± 0.03, ϕ* = (7.72 ± 1.4) × 10-3 h3 Mpc-3 and log (M*HI/M⊙) = (9.75 ± 0.041) + 2 log h. Using the measured HIMF, we find a cosmic HI density of ΩHI = (2.33 ± 0.07) × 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 ΩHI within this redshift range. We calculate a weighted average for ΩHI in the range 0HI = (2.63 ± 0.10) × 10-4 h-1.",
    author = "Laura Hoppmann and Lister Staveley-Smith and W. Freudling and M.A. Zwaan and R.F. Minchin and M.R. Calabretta",
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    A blind HI mass function from the arecibo ultra-deep survey (AUDS). / Hoppmann, Laura; Staveley-Smith, Lister; Freudling, W.; Zwaan, M.A.; Minchin, R.F.; Calabretta, M.R.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 452, No. 4, 2015, p. 3726-3741.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - A blind HI mass function from the arecibo ultra-deep survey (AUDS)

    AU - Hoppmann, Laura

    AU - Staveley-Smith, Lister

    AU - Freudling, W.

    AU - Zwaan, M.A.

    AU - Minchin, R.F.

    AU - Calabretta, M.R.

    PY - 2015

    Y1 - 2015

    N2 - © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 HI 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 deg2. In this paper, we present data from 60 per cent of the total survey, corresponding to a sensitivity level of 80 μJy. We discuss the data reduction, the search for galaxies, parametrization, optical identification and completeness. We detect 102 galaxies in the mass range of log (MHI/M)-2 log h = 5.6-10.3. We compute the HI mass function (HIMF) at the highest redshifts so far measured. A fit of a Schechter function results in α =-1.37 ± 0.03, ϕ* = (7.72 ± 1.4) × 10-3 h3 Mpc-3 and log (M*HI/M⊙) = (9.75 ± 0.041) + 2 log h. Using the measured HIMF, we find a cosmic HI density of ΩHI = (2.33 ± 0.07) × 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 ΩHI within this redshift range. We calculate a weighted average for ΩHI in the range 0HI = (2.63 ± 0.10) × 10-4 h-1.

    AB - © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 HI 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 deg2. In this paper, we present data from 60 per cent of the total survey, corresponding to a sensitivity level of 80 μJy. We discuss the data reduction, the search for galaxies, parametrization, optical identification and completeness. We detect 102 galaxies in the mass range of log (MHI/M)-2 log h = 5.6-10.3. We compute the HI mass function (HIMF) at the highest redshifts so far measured. A fit of a Schechter function results in α =-1.37 ± 0.03, ϕ* = (7.72 ± 1.4) × 10-3 h3 Mpc-3 and log (M*HI/M⊙) = (9.75 ± 0.041) + 2 log h. Using the measured HIMF, we find a cosmic HI density of ΩHI = (2.33 ± 0.07) × 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 ΩHI within this redshift range. We calculate a weighted average for ΩHI in the range 0HI = (2.63 ± 0.10) × 10-4 h-1.

    U2 - 10.1093/mnras/stv1084

    DO - 10.1093/mnras/stv1084

    M3 - Article

    VL - 452

    SP - 3726

    EP - 3741

    JO - Monthly Notices of the Royal Astronomical Society

    JF - Monthly Notices of the Royal Astronomical Society

    SN - 0035-8711

    IS - 4

    ER -