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

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344818f&link_type=abstract

American Astronomical Society, AAS Meeting #213, #448.18; Bulletin of the American Astronomical Society, Vol. 41, p.338

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Abell 115 is one of the "bimodal" clusters, first classified 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 (hereafter, 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. We combine Chandra X-ray and VLA radio observations to study the gas motions in and around A115-N that hosts 3C28. In addition to Chandra and VLA radio images, we present a spectral index map derived from multi-frequency VLA observations. We use the Chandra data to derive the velocity of A115-N with respect to the ambient intracluster medium as well as the velocity of the gas within the subcluster A115-N. We show that the 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 tails pointing in the direction of motion of A115-N. We compare the X-ray gas circulation time within A115-N with the timescale computed from the spectral aging of the radio-emitting plasma. We discuss the implications of these observations for the lifetimes of radio sources in gaseous atmospheres.

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