1919+479: Big WAT in a poor cluster

Details 1919+479: Big WAT in a poor cluster 1919+479: Big WAT in a poor cluster

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.2031p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 108, no. 6, p. 2031-2045

Astronomy and Astrophysics

Astronomy

21

Astronomical Models, Computerized Simulation, Galactic Clusters, Intergalactic Media, Radio Astronomy, Radio Galaxies, Red Shift, Visible Spectrum, X Ray Astronomy, X Ray Spectra, Image Processing, Luminosity, Proportional Counters, Rosat Mission, Spectrometers, Temperature, Velocity Distribution, Very Large Array (Vla)

Scientific paper

New x-ray, optical, and redshift data are presented for the cluster of galaxies associated with the giant, 1 Mpc diameter, wide-angle tailed (WAT) radio galaxy 1919+479. The ROSAT Position-Sensitive Proportional Counter (PSPC) pointed observation shows an x-ray peak on the WAT and elongated diffuse emission tracing the galaxy distribution. In addition, an asymmetric extension of emission exists between the tails of the WAT. The fitting of a Raymond-Smith thermal model to the x-ray spectra suggests an approximately = 2 keV temperature intracluster medium (ICM). The cooling time and irregular morphology rule out a cluster-wide cooling flow. The x-ray luminosity and temperature are consistent with the velocity dispersion, 480 km/s, estimated from 31 galaxy velocities. However, this velocity distribution is significantly non-Gaussian, which along with the x-ray morphology, suggests incomplete virialization in the cluster. Substructure analysis does not reveal significant clumping in the velocities/positions; but, the spatial distribution of galaxies is very elongated. Also, the cD galaxy producing the WAT does not have a significant radial peculiar velocity with respect to the cluster centroid. These characteristics are consistent with a merger scenario in which a subcluster has crossed the cluster core in the plane of the sky and has dispersed. We compare this cluster with the post-merger cluster Abell 2634 (Pinkney et al., 1993), containing the prototype WAT, and with a recent N-Body/Hydro simulation of merging clusters. The similarities indicate that the cluster 1919+479 may be the poor extreme of a class of clusters in which the bulk motion in the ICM, caused by a subcluster merger, in shaping the central WAT.

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