DEEP 21 cm H I OBSERVATIONS AT z ≈ 0.1: THE PRECURSOR TO THE ARECIBO ULTRA DEEP SURVEY

被引：40

作者：

Freudling, Wolfram ^{[1
]}

Staveley-Smith, Lister ^{[2
]}

Catinella, Barbara ^{[3
]}

Minchin, Robert ^{[4
]}

Calabretta, Mark ^{[5
]}

Momjian, Emmanuel ^{[6
]}

Zwaan, Martin ^{[1
]}

Meyer, Martin ^{[2
]}

O'Neil, Karen ^{[7
]}

机构：

[1] European So Observ, D-85748 Garching, Germany

[2] Univ Western Australia, Int Ctr Radio Astron Res M468, Crawley 6009, Australia

[3] Max Planck Inst Astrophys, D-85748 Garching, Germany

[4] Arecibo Observ, Arecibo, PR 00612 USA

[5] Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[6] Natl Radio Astron Observ, Socorro, NM 87801 USA

[7] Natl Radio Astron Observ, Green Bank, WV 24944 USA

来源：

ASTROPHYSICAL JOURNAL | 2011年 / 727卷 / 01期

关键词：

cosmology: observations; galaxies: evolution; radio lines: galaxies; BRIGHTEST HIPASS GALAXIES; STAR-FORMATION HISTORY; DIGITAL SKY SURVEY; FAST ALPHA SURVEY; MASS FUNCTION; NEUTRAL HYDROGEN; FORMING GALAXIES; CENTIMETER LINE; DATA RELEASE; BLIND SURVEY;

D O I：

10.1088/0004-637X/727/1/40

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The "ALFA Ultra Deep Survey" (AUDS) is an ongoing 21 cm spectral survey with the Arecibo 305 m telescope. AUDS will be the most sensitive blind survey undertaken with Arecibo's 300 MHz Mock spectrometer. The survey searches for 21 cm Hi line emission at redshifts between 0 and 0.16. The main goals of the survey are to investigate the Hi content and probe the evolution of Hi gas within that redshift region. In this paper, we report on a set of precursor observations with a total integration time of 53 hr. The survey detected a total of eighteen 21 cm emission lines at redshifts between 0.07 and 0.15 in a region centered around alpha(2000) approximate to 0(h), delta approximate to 15 degrees 42'. The rate of detection is consistent with the one expected from the local Hi mass function. The derived relative Hi density at the median redshift of the survey is rho(HI)[z = 0.125] = (1.0 +/- 0.3)rho(0), where rho(0) is the HI density at zero redshift.

引用

页数：16

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