Bibcode
Madrid, Juan P.; Donzelli, Carlos J.; Rodríguez-Ardila, A.; Paggi, Alessandro; Massaro, Francesco; Schirmer, Mischa
Referencia bibliográfica
The Astrophysical Journal Supplement Series, Volume 238, Issue 2, article id. 31, 9 pp. (2018).
Fecha de publicación:
10
2018
Número de citas
12
Número de citas referidas
12
Descripción
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 Hα + N[ II] and Hβ + [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.