A Deep Redshift Survey of the Perseus Cluster: Spatial Distribution and Kinematics of Galaxies

Abstract

We study the global kinematics of the Perseus galaxy cluster (Abell 426) at redshift z = 0.017 using a large sample of galaxies from our new MMT/Hectospec spectroscopic observation for this cluster. The sample includes 1447 galaxies with measured redshifts within 60' from the cluster center (1148 from this MMT/Hectospec program and 299 from the literature). The resulting spectroscopic completeness is 67% at r-band apparent magnitude $r_{\mathrm{Petro},0}\le 18.0$ within 60' from the cluster center. To identify cluster member galaxies in this sample, we develop a new open-source Python package, CausticSNUpy. This code implements the algorithm of the caustic technique and yields 418 member galaxies within 60' of the cluster. We study the cluster using this sample of member galaxies. The cluster shows no significant signal of global rotation. A statistical test shows that the cluster does not have a noticeable substructure within 30'. We find two central regions where the X-ray emitting intracluster medium and galaxies show significant velocity differences ($>7\sigma$). On a large scale, however, the overall morphology and kinematics between the intracluster medium and galaxies agree well. Our results suggest that the Perseus cluster is a relaxed system and has not experienced a recent merger.

21 pages, 17 figures, accepted for publication in ApJS

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Cited by in corpus (6)

• Euclid: Early Release Observations -- Dwarf galaxies in the Perseus galaxy cluster
• Deep view of the intracluster light in the Coma cluster of galaxies
• Euclid: Early Release Observations of ram-pressure stripping in the Perseus cluster. Detection of parsec scale star formation with in the low surface brightness stripped tails of UGC 2665 and MCG +07-07-070
• A Redshift Survey of the Coma Cluster (A1656): Understanding the Nature of Subhalos in the Weak-lensing Map
• Perseus cluster in its X-ray entirety with SRG/eROSITA. Merger and Radio-Uroboroses
• The Splashback Mass Function of Galaxy Clusters from Photometric Data