Cosmicflows-2：I波段亮度- HI线宽校准
Cosmicflows-2: I-band Luminosity - HI Linewidth Calibration
摘要：
为了利用星系光度和自转速率之间的相关性，以最小的系统学来测量距离，有必要坚持严格和经过测试的配方。现在，我们从中性氢线轮廓的宽度的新表征中获得旋转的度量。此外，新的测光和零点校准数据可用。特别是新线宽参数的引入，需要对亮度-线宽模板进行重建和绝对校准。新模板的斜率由13个星系团中的267个星系设定。零点由36个距离造父变星或红巨星分支尖端的星系设定。因此，我们确定H 0 = 75 km s-1 Mpc-1。使用光度线宽校准确定的距离将有助于距离纲要Cosmicflows-2。
英文摘要：
In order to measure distances with minimal systematics using the correlation between galaxy luminosities and rotation rates it is necessary to adhere to a strict and tested recipe. We now derive a measure of rotation from a new characterization of the width of a neutral Hydrogen line profile. Additionally, new photometry and zero point calibration data are available. Particularly the introduction of a new linewidth parameter necessitates the reconstruction and absolute calibration of the luminosity-linewidth template. The slope of the new template is set by 267 galaxies in 13 clusters. The zero point is set by 36 galaxies with Cepheid or Tip of the Red Giant Branch distances. Tentatively, we determine H0 = 75 km s-1 Mpc-1. Distances determined using the luminosity-linewidth calibration will contribute to the distance compendium Cosmicflows-2.
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