Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20501i&link_type=abstract
Spitzer Proposal ID #20501
Physics
Scientific paper
We propose IRS spectral mapping of several distinct environments along the jet of NGC 5128 (Cen A) to determine the characteristics of star formation, dust properties, and shocked gas where the jet interacts with the outer regions of the galaxy. Powerful jets are common phenomena of AGN with massive black holes. The jets carry substantial energy out of AGN and may induce significant star formation along the way. Cen A is the nearest AGN with a powerful jet and a key object for understanding the jet-galaxy interactions. Recently, UV emission was detected by GALEX along the jet of Cen A at distances up to 40 kpc from the AGN. Some of the UV emission is associated young hot stars, whose formation was probably induced by jet-cloud interaction. However, significant amounts of UV emission are detected that are not clearly associated with star formation. Optical emission ([O III], Halpha) may arise from collisionally ionized gas associated with jet shocks, or from photoionization by young stars. IRS 5-15 um spectral mapping of key regions in Cen A, augmented by our GALEX and FUSE observations, will permit us to determine the origin of the hot plasma (shocks or stars) and the distribution of young stars as traced by dust in the star forming region.
Iping Rosina
Neff Susan
Sonneborn George
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