文章基本信息

标题：NIBLES – an HI census of stellar mass selected SDSS galaxies - II. Arecibo follow-up HI observations
其他标题：II. Arecibo follow-up HI observations⋆
本地全文：下载
作者：Z. Butcher ; Z. Butcher ; S. Schneider 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2016
卷号：596
页码：1-20
DOI：10.1051/0004-6361/201628189
语种：English
出版社：EDP Sciences
摘要：We obtained Arecibo Hi line follow-up observations of 154 of the 2600 galaxies in the Nançay Interstellar Baryons Legacy Extragalactic Survey (NIBLES) sample. These observations are on average four times more sensitive than the original observations at the Nançay Radio Telescope. The main goal of this survey is to characterize the underlying Hi properties of the NIBLES galaxies which were undetected or marginally detected at Nançay. Of the Nançay non-detections, 85% were either clearly or marginally detected at Arecibo, while 89% of the Nançay marginal detections were clearly detected. Based on the statistics of the detections relative to g−i color and r-band luminosity (Lr) distribution among our Arecibo observations, we anticipate ~60% of our 867 Nançay non-detections and marginal detections could be detected at the sensitivity of our Arecibo observations. Follow-up observations of our low luminosity (Lr < 108.5L⊙) blue sources indicate that they have, on average, more concentrated stellar mass distributions than the Nançay detections in the same luminosity range, suggesting we may be probing galaxies with intrinsically different properties. These follow-up observations enable us to probe Hi mass fractions, log(MHI/M⋆) 0.5 dex and 1 dex lower, on average, than the NIBLES and ALFALFA surveys respectively.
关键词：surveys;galaxies: general;galaxies: distances and redshifts;radio lines: galaxies;galaxies: ISM