Combining X-ray And Low-frequency Radio Observations Of Galaxy Groups: Insights And Puzzles On Agn Heating

Details Combining X-ray And Low-frequency Radio Observations Of Galaxy Groups: Insights And Puzzles On Agn Heating Combining X-ray And Low-frequency Radio Observations Of Galaxy Groups: Insights And Puzzles On Agn Heating

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0904v&link_type=abstract

American Astronomical Society, HEAD meeting #10, #9.04

Astronomy and Astrophysics

Astronomy

Scientific paper

To address the role of centrally-located active galaxies on the heating of intragroup gas and on the regulation of cooling cores, we have undertaken low-frequency radio observations of a sample of 18 elliptical-dominated groups selected for the availability of high quality X-ray data from Chandra or XMM and for structure indicative of AGN/hot gas interaction in X-rays and/or radio. Most targets have now been observed with the GMRT at a subset of the desired frequencies, yielding multiple detections of extended and complex radio structures, most with clear relations to the X-ray structures. Radio observations at multiple (especially low) frequencies allow the production of spectral index maps and the derivation of radiative ages, and can reveal the radio counterparts to X-ray "ghost" cavities that contain old/low-energy electron populations. We are combining radio and X-ray data to establish the properties of the central radio sources over a broad frequency range, examine the effects of the central AGN at various phases of activity, and quantify the geometry, timescales, and physical mechanisms of the energy injection.

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