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The Atacama Cosmology Telescope: High-Resolution Sunyaev-Zel'dovich Array Observations of ACT SZE-Selected Clusters from the Equatorial Strip

机译:阿塔卡马宇宙望远镜:从赤道带选出的ACT SZE选星团的高分辨率Sunyaev-Zel'dovich阵列观测

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摘要

We present follow-up observations with the Sunyaev-Zel'dovich Array (SZA) of optically-confirmed galaxy clusters found in the equatorial survey region of the Atacama Cosmology Telescope (ACT): ACT-CL J0022-0036, ACT-CL J2051+0057, and ACT-CL J2337+0016. ACT-CL J0022-0036 is a newly-discovered, massive (10(exp 15) Msun), high-redshift (z=0.81) cluster revealed by ACT through the Sunyaev-Zel'dovich effect (SZE). Deep, targeted observations with the SZA allow us to probe a broader range of cluster spatial scales, better disentangle cluster decrements from radio point source emission, and derive more robust integrated SZE flux and mass estimates than we can with ACT data alone. For the two clusters we detect with the SZA we compute integrated SZE signal and derive masses from the SZA data only. ACT-CL J2337+0016, also known as Abell 2631, has archival Chandra data that allow an additional X-ray-based mass estimate. Optical richness is also used to estimate cluster masses and shows good agreement with the SZE and X-ray-based estimates. Based on the point sources detected by the SZA in these three cluster fields and an extrapolation to ACT's frequency, we estimate that point sources could be contaminating the SZE decrement at the less than = 20% level for some fraction of clusters.
机译:我们将使用在阿塔卡马宇宙望远镜(ACT)的赤道调查区发现的光学确认星系团的Sunyaev-Zel'dovich阵列(SZA)进行后续观察:ACT-CL J0022-0036,ACT-CL J2051 + 0057和ACT-CL J2337 + 0016。 ACT-CL J0022-0036是ACT通过Sunyaev-Zel'dovich效应(SZE)揭示的新发现的,巨大的(10(exp 15)Msun)高红移(z = 0.81)簇。通过SZA进行的深入,有针对性的观测,使我们能够探索更宽范围的星团空间尺度,更好地解散从无线电点源发射产生的星团减量,并获得比仅使用ACT数据更可靠的SZE通量和质量估计。对于我们用SZA检测到的两个簇,我们计算积分的SZE信号并仅从SZA数据得出质量。 ACT-CL J2337 + 0016(也称为Abell 2631)具有档案Chandra数据,可以进行其他基于X射线的质量估算。光学丰度也可用于估算星团质量,并与SZE和基于X射线的估算值具有很好的一致性。根据SZA在这三个群集场中检测到的点源以及对ACT频率的外推,我们估计,对于部分群集,点源可能在小于= 20%的水平上污染SZE减量。

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