NIBLES -HI对选定的SDSS星系进行的恒星质量普查：I. Nançay HI调查
NIBLES - an HI census of stellar mass selected SDSS galaxies: I. The Nançay HI survey
摘要：
为了研究星系性质与其总恒星质量的函数关系，我们在100米级的南赛射电望远镜上获得了来自斯隆数字巡天（SDSS）的2839个星系的21厘米HI线观测，这些星系位于本体积（900<cz<12，000 km/s），被称为南赛星际重子遗产河外巡天（NIBLES）样本。它们是在SDSS Z波段绝对星等（-13.5至-24等）的整个范围内均匀选择的，这些星等被用作恒星质量的替代。在这里，第一个，全球性的介绍的意见和基本结果，他们的进一步分析将在本系列的其他文件。这些星系是根据SDSS DR 5中列出的属性选择的。通过将这一测光结果与它们的HI总质量进行比较，我们注意到，对于百分之几的部分，SDSS的星等似乎严重低估，这一点已经被我们对选定天体的重新测量所证实。虽然使用较新的DR 9结果在大多数情况下消除了这个问题，但384仍然需要手动光度源选择。获得了2600个星系的可用HI光谱，其中1733个（67%）被清楚地检测到，174个（7%）勉强。由于HI或SDSS数据的问题，其他241个观测星系的光谱无法用于进一步分析。在Mz范围-16.5至-23 mag.内，我们达到了每半个星等仓约150个源的目标数量。下降到-21 mag.，总体探测率相当恒定，在~75%的水平，但在-23 mag.开始稳步下降到30%的水平。通过比较我们样本的总HI和恒星质量进行回归拟合，包括我们保守估计的未检测到的HI上限，我们发现关系log（M_HI/M*）= -0.59 log（M*）+5.05，其显著低于仅使用HI检测时在M_HI/M* - M* 平面中发现的关系。
英文摘要：
To investigate galaxy properties as a function of their total stellar mass, we obtained 21cm HI line observations at the 100-m class Nançay Radio Telescope of 2839 galaxies from the Sloan Digital Sky Survey (SDSS) in the Local Volume (900<cz<12,000 km/s), dubbed the Nançay Interstellar Baryons Legacy Extragalactic Survey (NIBLES) sample. They were selected evenly over their entire range of absolute SDSS z-band magnitudes (-13.5 to -24 mag), which were used as a proxy for their stellar masses. Here, 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 selected based on their properties, as listed in SDSS DR5. Comparing this photometry to their total HI 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 HI spectra were obtained for 2600 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 HI or the SDSS data. We reached the target number of about 150 sources per half-magnitude bin over the Mz range -16.5 to -23 mag. Down to -21 mag the overall detection rate is rather constant at the ~75% level but it starts to decline steadily towards the 30% level at -23 mag. Making regression fits by comparing total HI and stellar masses for our sample, including our conservatively estimated HI upper limits for non-detections, we find the relationship log(M_HI/M*) = -0.59 log(M*) + 5.05, which lies significantly below the relationship found in the M_HI/M* - M* plane when only using HI detections.
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