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Title:
The low-power nucleus of PKS 1246-410 in the Centaurus cluster
Authors:
Taylor, G. B.; Sanders, J. S.; Fabian, A. C.; Allen, S. W.
Affiliation:
AA(Kavli Institute of Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USA; National Radio Astronomy Observatory, Socorro, NM 87801, USA; University of New Mexico, Department of Physics and Astronomy, Albuquerque, NM 87131, USA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AD(Kavli Institute of Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 365, Issue 3, pp. 705-711. (MNRAS Homepage)
Publication Date:
01/2006
Origin:
MNRAS
MNRAS Keywords:
accretion, accretion discs, galaxies: clusters: individual: Centaurus, intergalactic medium, radio continuum: galaxies
DOI:
10.1111/j.1365-2966.2005.09705.x
Bibliographic Code:
2006MNRAS.365..705T

Abstract

We present Chandra, Very Large Array (VLA) and Very Long Baseline Array (VLBA) observations of the nucleus of NGC 4696, a giant elliptical in the Centaurus cluster of galaxies. Like M87 in the Virgo cluster, PKS 1246-410 in the Centaurus cluster is a nearby example of a radio galaxy in a dense cluster environment. In analysing the new X-ray data, we have found a compact X-ray feature coincident with the optical and radio core. While nuclear emission from the X-ray source is expected, its luminosity is low, <1040ergs-1. We estimate the Bondi accretion radius to be 30pc and the accretion rate to be 0.01Msolaryr-1, which under the canonical radiative efficiency of 10 per cent would overproduce by 3.5 orders of magnitude the radiative luminosity. Much of this energy can be directed into the kinetic energy of the jet, which over time inflates the observed cavities seen in the thermal gas. The VLBA observations reveal a weak nucleus and a broad, one-sided jet extending over 25pc in position angle -150°. This jet is deflected on the kiloparsec-scale to a more east-west orientation (position angle of -80°).

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