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arXiv 0812.1288astro-ph
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Ks波段Tully-Fisher关系--由218个ScI星系团和16个星系团测定哈勃参数

The Ks-band Tully-Fisher Relation - A Determination of the Hubble Parameter from 218 ScI Galaxies and 16 Galaxy Clusters

David G. Russell

摘要:

哈勃参数(H 0)的值是使用形态类型相关的KS波段塔利-费舍尔关系(K-TFR)确定的。用36个具有ScI形态的校准星系确定了斜率和零点。校准距离采用造父变星的直接距离,以及用表面亮度波动方法或Ia型超新星导出的群或伴星距离。16个星系团和218个ScI星系的最小距离为40.0 Mpc。从16个星系团中得到加权平均哈勃参数H_0 =84.2 +/-6 km·s ~(-1)Mpc ~(-1)。从218个ScI星系中得到加权平均哈勃参数H_0 =83.4 +/-8 km·s ~(-1)Mpc ~(-1)。当修正K-TFR的零点以解释最近发现的大麦云云的距离模为18.39 +/-8 km·s ~(-1)Mpc ~(-1 0.05 a哈勃参数为88.0 +/-6 km s-1 Mpc-1,并与Hubble Key Project(Freedman et al 2001)的结果进行了比较,讨论了K-TFR距离与HKP I-TFR距离之间的差异。Lamda-CDM宇宙学的影响被认为是与H 0 =84 km s-1 Mpc-1。(节录)

英文摘要:

The value of the Hubble Parameter (H0) is determined using the morphologically type dependent Ks-band Tully-Fisher Relation (K-TFR). The slope and zero point are determined using 36 calibrator galaxies with ScI morphology. Calibration distances are adopted from direct Cepheid distances, and group or companion distances derived with the Surface Brightness Fluctuation Method or Type Ia Supernova. Distances are determined to 16 galaxy clusters and 218 ScI galaxies with minimum distances of 40.0 Mpc. From the 16 galaxy clusters a weighted mean Hubble Parameter of H0=84.2 +/-6 km s-1 Mpc-1 is found. From the 218 ScI galaxies a Hubble Parameter of H0=83.4 +/-8 km s-1 Mpc-1 is found. When the zero point of the K-TFR is corrected to account for recent results that find a Large Magellanic Cloud distance modulus of 18.39 +/-0.05 a Hubble Parameter of 88.0 +/-6 km s-1 Mpc-1 is found. A comparison with the results of the Hubble Key Project (Freedman et al 2001) is made and discrepancies between the K-TFR distances and the HKP I-TFR distances are discussed. Implications for Lamda-CDM cosmology are considered with H0=84 km s-1 Mpc-1. (Abridged)

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