首页> 外文期刊>The Astrophysical journal >GLOBULAR CLUSTER SYSTEMS IN FOUR BRIGHTEST CLUSTER GALAXIES: A262, A3560, A3565, AND A3742
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GLOBULAR CLUSTER SYSTEMS IN FOUR BRIGHTEST CLUSTER GALAXIES: A262, A3560, A3565, AND A3742

机译:四个最明亮的群集星系中的球形群集系统:A262,A3560,A3565和A3742

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摘要

We have used deep I-band (F814W) images from the Hubble Space Telescope archive to study the globular cluster systems around the brightest cluster galaxies (BCGs) in A262, A3560, A3565, and A3742. Three of these BCGs have inner dust lanes and peculiar structural features that indicate past histories of low-level interaction and accretion. The deep I-band WFPC2 images have photometric limits that, for all four galaxies, reach near or just beyond the globular cluster luminosity function (GCLF) turnover point. Their specific frequencies are 8.24 +- 1.65, 4.66 +- 0.93, 2.58 +- 0.52, and 2.62 +- 0.52, respectively, all within a factor of 2 of the normal range for giant elliptical galaxiesy. We obtain new estimates of the GCLF turnover magnitudes, which are shown to be consistent with an adopted Hubble constant of H_0 approx= 70 km s~(-1) Mpc~(-1) on the "Hubble diagram" of GCLF turnover apparent magnitude versus red-shift, on a distance scale where the fundamental GCLF calibrator E galaxies (M87 and others) in Virgo are at d = 16 Mpc.
机译:我们已使用哈勃太空望远镜档案库中的深I带(F814W)图像研究了A262,A3560,A3565和A3742中最亮的星系星系(BCG)周围的球状星团系统。这些BCG中的三个具有内部尘埃带和特殊的结构特征,这些特征表明过去的低水平相互作用和增生历史。 I波段深WFPC2图像具有光度极限,对于所有四个星系,其光球极限均接近或刚好超过球状星团光度函数(GCLF)转换点。它们的特定频率分别为8.24±1.65、4.66±0.93、2.58±0.52和2.62±0.52,均在巨型椭圆星系正常范围的2倍之内。我们获得了新的GCLF周转幅度估计值,该估计值与在GCLF周转视差幅度的“哈勃图”上采用的H_0约等于70 km s〜(-1)Mpc〜(-1)的哈勃常数相一致。相对于红移,在一个距离尺度上,处女座中的基本GCLF校准器E星系(M87等)在d = 16 Mpc。

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