Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545802l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #458.02; Bulletin of the American Astronomical Society, Vol. 42, p.483
Other
Scientific paper
Combined Chandra, Spitzer, XMM-Newton, and VLA observations of the giant radio galaxy NGC 1316 (Fornax A) show features indicative of an AGN outburst likely triggered by a merger with a galaxy with a stellar mass of 0.9-7.8x1010 solar masses about 0.4 Gyr ago. X-ray cavities in the Chandra and XMM-Newton images likely result from the radio jet and the expansion of the radio lobes. The dust emission seen at wavelengths longer than 4.5 microns is strongest in the regions with little or no radio emission, suggesting that the expanding radio plasma removes or destroys the dust as well as the hot gas. Comparison of NGC 1316 to other low luminosity AGN early-type hosts suggests the amount and distribution of the infrared emission to be unusual. These results constrain properties of the outburst and the merger galaxy. The size of the X-ray cavities implies a minimum outburst energy of 1.2x1058 ergs. The present size of the radio lobes implies that the outburst is at least 0.4 Gyr old. The inferred dust mass implies that the merger galaxy was a late-type spiral with a stellar mass of 0.9-7.8x1010 solar masses and a gas mass of 0.4-4.4x1010 solar masses. This research was supported by the Smithsonian Institution, the Chandra X-ray Center, and NASA contract NNX07AQ18G.
Ashby Matthew L. N.
Forman William R.
Hickox Ryan C.
Jones Christine
Kraft Ralph
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