3C28 in Abell 115- A Radio Source With a Twist

Type Conference Paper
Names W. Forman, E. Churazov, S. Giacintucci, M. Machacek, R. Kraft, C. Jones, S. Heinz, M. Markevitch, A. Vikhlinin, M. Murgia, S. Randall, R. Johnson
Proceedings Title AIP Conference Series
Conference Name X-Ray Astronomy 2009; Present Status, Multi-Wavelength Approach and Future Perspectives: Proceedings of the International Conference
Place Melville, NY
Publisher American Institute of Physics
Volume 1248
Pages 273-276
Series AIP Conference Proceedings
Date July 1, 2010
URL http://adsabs.harvard.edu/abs/2010AIPC.1248..273F
Library Catalog NASA ADS
Abstract Abell 115 contains two merging subclusters separated by about 900 kpc. The northern subcluster (hereafter, A115-N) contains a bright central galaxy that hosts the radio source 3C28 which has a remarkable morphology. Although there is no detectable active nucleus, two prominent jets connect 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. We use the Chandra data to estimate 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 suggest that the motion of A115-N through the cluster induces counter-rotating vortices in the subcluster gas that explain the unique morphology of 3C28 with its two tails pointing in the direction of motion for 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 and discuss the implications of these observations for the lifetimes of radio sources in gaseous atmospheres.
Tags ASTRONOMICAL OBSERVATORIES, Galactic center, Galactic centre, Observatories and site testing, Radio, and bipolar flows, and bulge, astrophysical jets, bar, circumnuclear matter, jets, microwave, outflows, radio sources (astronomical)
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