IDCS J1426 +3508:发现z = 1.75的大质量红外选择星系团
IDCS J1426+3508: Discovery of a Massive, IR-Selected Galaxy Cluster at z = 1.75
摘要:
我们报道了在IRAC遥远星系团巡天(IDCS)中发现的一个红外选择的大质量星系团。我们提出了新的数据从哈勃太空望远镜和W。M.凯克天文台,光谱确认IDCS J1426+3508在z=1.75。此外,集群检测档案钱德拉数据作为一个扩展的X射线源,包括54个计数后,删除点源。我们计算了在r = 60 arcsec(~1 Mpc直径)内的X射线光度L{0.5-2 keV} =(5.5 +/- 1.2)X 1 e44 ergs/s,这意味着M_{200,L_x} =(5.6 +/- 1.6)X 1 e14 Msun。IDCS J1426+3508似乎是一个非常大的星系团,因为它的红移。
英文摘要:
We report the discovery of an IR-selected massive galaxy cluster in the IRAC Distant Cluster Survey (IDCS). We present new data from the Hubble Space Telescope and the W. M. Keck Observatory that spectroscopically confirm IDCS J1426+3508 at z=1.75. Moreover, the cluster is detected in archival Chandra data as an extended X-ray source, comprising 54 counts after the removal of point sources. We calculate an X-ray luminosity of L{0.5-2 keV} = (5.5 +/- 1.2) X 1e44 ergs/s within r = 60 arcsec (~1 Mpc diameter), which implies M_{200,L_x} = (5.6 +/- 1.6) X 1e14 Msun. IDCS J1426+3508 appears to be an exceptionally massive cluster for its redshift.
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