Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sacm.confe..23m&link_type=abstract
The Starburst-AGN Connection under the Multiwavelength Limelight, held 14-16 September 2011. Published online at http://www.scio
Physics
Scientific paper
We present striking new results on the Circinus galaxy, the second nearest (˜4 Mpc) AGN and the closest type 2 Seyfert. This spiral galaxy is also peculiar in that it is radio-loud, with a pair of lobes spanning 7 kpc, and has a starburst ring and an ionisation cone. Our new deep (200 ks) Chandra data show, in a detail never achieved before for this kind of object, shells of shocked gas outside the radio lobes, with a temperature kT=0.74^{+0.07}_{-0.11} keV. Thanks to the exceptional spatial resolution achievable for Circinus, we have discovered that, unlike what has been observed in Centaurus A, the radio and X-ray emission in Circinus are spatially coincident, and notably edge-brightened, implying that we may be seeing the shock in radio (synchrotron) as well as in X-rays. This morphology is closely related to what is seen in SNR, and has been expected for AGN outflows, but it has never been observed before. This may lead to a reinterpretation of results on more distant systems, where this resolution is not achievable. Circinus may prove crucial to understand AGN feedback and its dependence on power and galaxy morphology.
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