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The faint end of the HI mass function

机译：Hi Mass功能的微弱末端

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We study the faint end of the HI mass function (HIMF) in order to test the predictions of the CDM theory on the number density of objects with small (dark) masses. The neutral hydrogen is much better tracer of the underlying mass distribution compared to the luminous matter and can be used to test the existence of a population of small galaxies in which the star formation has been partially or completely suppressed during cosmic evolution. Due to technical limitations, the existing HI surveys are not very sensitive on masses below 108 HI Mo. We designed a blind HI survey to be sensitive for objects with small HI masses. The surveyed area is in the Canis Venatici groups of galaxies and covers in total =86 deg~2 of sky, with the observed velocities in the range –350 < cz < 1400 km s~(-1). We detected 69 objects, 22 of them for the first time in HI. All new HI detections fall in the lower part of the masshistogram, confirming our ability to detect galaxies with small HI masses. The calculated HIMF is flat in the faint end regime (a –1), different from the steep rise predicted by CDM models. Possible effects of the environment on the estimated HIMF parameters are discussed.
机译：我们研究了HI质量函数（HIMF）的微弱的末端，以测试CDM理论的预测，以小（暗）质量的物体的数量密度。与发光物相比，中性氢是更好的基本质量分布的示踪剂，并且可用于测试在宇宙演化期间部分或完全抑制星形形成的小星系群的存在。由于技术限制，现有的嗨调查对108号致的群众不太敏感。我们设计了一个盲教致电调查，对小群众的物体敏感。受测量的区域位于CanisVenatici星系中的星系组，总共= 86°〜2的天空，观察到的速度范围为-350

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