2018/10/15 by Juan P. Madrid, Carlos J. Donzelli, Alberto Rodriguez-Ardila +4 · 1 citation
Physics and Astronomy · #Abell 2744 #Astronomy and Astrophysical Research #Astrophysics and Cosmic Phenomena #Brightest cluster galaxy #Cluster (spacecraft) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #RADIUS #Redshift #Surface brightness #Velocity dispersion #astro-ph.GA
paper · pdf · doi:10.3847/1538-4365/aade8f
published as Astrophysical Journal Supplement Series, 238, 31 (2018)
openalex publication_date 2018/10/15 · arxiv created 2018/10/18 · arxiv updated 2018/10/22 · openalex created_date 2018/10/26 · openalex updated_date 2026/08/06
Gemini Multi Object Spectrograph medium-resolution spectra and photometric data of 39 objects in the field of the radio galaxy 3C 17 are presented. Based on the new data, a previously uncataloged cluster of galaxies is identified at a mean redshift of z = 0.220 ± 0.003, a projected virial radius of 0.37 Mpc, and a velocity dispersion of σ v = 821 ± 171 km s −1 . The brightest member of this cluster is 3C 17, with M r = −22.45 mag. The surface brightness profile of 3C 17 is best fit with two components (Exponential + Sérsic) characteristic of brightest cluster galaxies. The spectrum of 3C 17 is dominated by broad emission lines H α + N[ ii ] and H β + [O iii ]. Analysis of Chandra data shows extended emission around the cluster core that supports the existence of hot gas cospatial with 3C 17. The discovery of a cluster of galaxies around 3C 17 better explains the sharply bent morphology of the radio jet given that it propagates through a dense intracluster medium.