NIBLES: an HI census of stellar mass selected SDSS galaxies I. The Nancay HI survey
Artikel i vetenskaplig tidskrift, 2016

To investigate galaxy properties as a function of their total stellar mass, we obtained 21 cm H I line observations at the 100-m class Nancay Radio Telescope of 2839 galaxies from the Sloan Digital Sky Survey (SDSS) in the Local Volume (900 < cz < 12 000 km s(-1)), dubbed the Nancay Interstellar Baryons Legacy Extragalactic Survey (NIBLES) sample. They were selected evenly over their entire range of absolute SDSS z-band magnitudes (M-z similar to -13.5 to -24 mag), which were used as a proxy for their stellar masses. In this paper, a first, global presentation of the observations and basic results is given; their further analysis will be presented in other papers in this series. The galaxies were originally selected based on their properties, as listed in SDSS DR5. Comparing this photometry to their total H I masses, we noted that, for a few percent, the SDSS magnitudes appeared severely misunderestimated, as confirmed by our re-measurements for selected objects. Although using the later DR9 results eliminated this problem in most cases, 384 still required manual photometric source selection. Usable H I spectra were obtained for 2600 of the galaxies, of which 1733 (67%) were clearly detected and 174 (7%) marginally. The spectra for 241 other observed galaxies could not be used for further analysis owing to problems with either the H I or the SDSS data. We reached the target number of about 150 sources per half-magnitude bin over the M-z range -16.5 to -23 mag. Down to -21 mag the overall detection rate is rather constant at the similar to 75% level but it starts to decline steadily towards the 30% level at -23 mag. Making regression fits by comparing total H I and stellar masses for our sample, including our conservatively estimated H I upper limits for non-detections, we find the relationship log(MH I/M-star) = -0.59 log(M-star) + 5.05, which lies significantly below the relationship found in the MH I/M-star - M-star plane when only using H I detections.

galaxies: general

galaxies: photometry

galaxies: ISM

radio lines: galaxies

galaxies: distances and redshifts

Författare

W. van Driel

Universite d'Orleans

Universite Paris 7- Denis Diderot

Z. Butcher

University of Massachusetts

S. Schneider

University of Massachusetts

M. Lehnert

Universite Pierre et Marie Curie

R. Minchin

National Astronomy and Ionosphere Center

S. L. Blyth

University of Cape Town

L. Chemin

Universite de Bordeaux

CNRS Centre National de la Recherche Scientifique

Universite Paris 7- Denis Diderot

N. Hallet

Universite Paris 7- Denis Diderot

T. Joseph

University of Cape Town

P. Kotze

University of Cape Town

Southern African Large Telescope Foundation

R. C. Kraan-Korteweg

University of Cape Town

Henrik Olofsson

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

M. Ramatsoku

University of Cape Town

University of Groningen, Kapteyn Astronomical Institute

Netherlands Foundation for Research in Astronomy

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 595 A118-

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201528048