3C28 in Abell 115-- A Radio Source With a Twist: Tracing Gas Vortices in a Merging Subcluster Core

Details 3C28 in Abell 115-- A Radio Source With a Twist: Tracing Gas Vortices in a Merging Subcluster Core 3C28 in Abell 115-- A Radio Source With a Twist: Tracing Gas Vortices in a Merging Subcluster Core

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.100f&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Physics

Clusters Of Galaxies

Scientific paper

Abell 115 is one of the ``bimodal'' clusters, first identified from Einstein Observatory X-ray images. The X-ray image is dominated by emission from two subclusters, separated by about 900 kpc, that are in the process of merging. The northern subcluster (A115-N) contains a bright central galaxy that hosts the radio source 3C28. 3C28 has a remarkable morphology. Although there is no evidence of an active nucleus, there are two prominent jets connected to a pair of radio lobes, each of which exhibits a radio tail. A115-N shows a classic cold front, the remarkable phenomenon first studied from Chandra cluster observations. We exploit the Chandra data and the cold front phenomenon to study the gas motions in and around A115-N that hosts 3C28. We estimate the velocity of A115-N with respect to the ambient intracluster medium. This motion of A115-N through the cluster induces counter-rotating vortices in the subcluster gas that give rise to the unique morphology of 3C28 with its two radio tails pointing in the direction of motion of A115-N. Thus, the radio emitting plasma acts as a dye in a fluid tracing the vortices in the X-ray emitting gas, resembling text book pictures of fluid motions. This makes A115 an ideal object for detailed studies of plasma dynamics in clusters, including effects of thermal conduction and viscosity.

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