Abstract

An example of simultaneous spectroscopic redshift measurements for a large number of galaxies in a cluster by multiobject spectroscopy with the medium- and low-resolution TFOSC spectrograph at the RussianTurkish 1.5-m telescope (RTT150) is presented. The redshifts of galaxies in the cluster \(0301.6+0156\) at \(z=0.17057\pm 0.0004\) detected previously by the SunyaevZeldovich signal in the Planck all-sky survey have been measured. The spectra of 16 cluster galaxies, 9 of which were determined as ellipticals, were taken in one observation with an exposure time of 3 h and high-quality redshift measurements were made for them. We show that the redshifts of galaxies with magnitudes to \(m_{r}=20.0\), whose number in the TFOSC field can reach dozens, depending on the cluster richness and distance, can be measured in one observation with the TFOSC spectrograph using multiobject masks. Such measurements may be required to refine the redshifts of clusters and to estimate their masses by the dynamical method.

中文翻译：

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在1.5米望远镜RTT150上通过多缝光谱对星团中的星系进行红移测量

摘要

给出了一个示例，该示例通过在俄罗斯土耳其1.5米望远镜（RTT150）上使用中分辨率和低分辨率TFOSC光谱仪进行多目标光谱对集群中大量星系进行同时光谱红移测量。在集群中的星系的红移\（0301.6 + 0156 \）在\（Z = 0.17057 \ PM 0.0004 \）已经测量之前检测到的由普朗克全天空调查SunyaevZeldovich信号。在一次观测中以3小时的曝光时间拍摄了16个星系星团的光谱，其中9个被确定为椭圆星系，并对其进行了高质量的红移测量。我们显示星系的红移幅度为\（m_ {r} = 20.0 \）根据TFOSC光谱仪使用多目标遮罩在一个观测值中可以测量TFOSC字段中的数量，具体取决于群集的丰富程度和距离。可能需要进行此类测量，以完善群集的红移并通过动态方法估算其质量。