Hydra A: A New Picture

Details Hydra A: A New Picture Hydra A: A New Picture

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xrrc.proce7.19l&link_type=abstract

"X-Ray and Radio Connections (eds. L.O. Sjouwerman and K.K Dyer) Published electronically by NRAO, http://www.aoc.nrao.edu/event

Computer Science

X-Ray, Radio, Dissipation Of Jets

Scientific paper

We present new, low-frequency images of the powerful FRI radio galaxy Hydra A (3C218), which lies at the center of the poor Abell cluster A780. Images were made with the Very Large Array at frequencies of 1415, 330, and 74 MHz, with resolutions on the order of 20 arcsec. The morphology of the source is seen to be more complex and larger than previously known, and extends nearly 8 arcmin (530 kpc) in a North-South direction. The southern lobe is bent to the east and extends in that direction for nearly 3 arcmin (200 kpc). We find that the northern lobe has a flatter spectral slope than the southern lobe, consistent with the appearance of greater confinement to the south. A comparison to X-ray observations of the thermal gas in this system shows that Hydra A is surrounded by dense, cool gas which extends well beyond the inner bright radio jets. This may be entrained cluster core gas which has been dragged out by buoyantly rising outer lobes.

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