Using Near-IR Imaging to Probe Accretion-Disk Physics in Powerful Radio Sources

Details Using Near-IR Imaging to Probe Accretion-Disk Physics in Powerful Radio Sources Using Near-IR Imaging to Probe Accretion-Disk Physics in Powerful Radio Sources

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..250k&link_type=abstract

NOAO Proposal ID #1999B-0250

Computer Science

Scientific paper

An intriguing question in the study of powerful radio galaxies concerns the reason for their wide diversity of properties: is this related predominantly to external environmental effects, or to intrinsic differences in their central engines and accretion processes? We propose to address this question by using the 2.1m + ONIS to obtain J, H and K imaging of two samples of FR I and FR II radio galaxies, to measure the luminosity and colors of warm circumnuclear dust and determine the near- IR structure and environment of the surrounding host galaxies. The dust absorbs radiation from the AGN and re-radiates it in the near-IR, which can thus be used as a diagnostic of the AGN radiant energy output. This will be compared with the AGN kinetic energy output in the form of radio jets. Our two samples are statistically well-matched in both radio power and redshift space, allowing us to carry out statistical comparisons between AGN properties such as the radiant / kinetic energy conversion, as well as large-scale host galaxy properties. This will indicate whether differences between these classes of active galaxies are related primarily to the central engine, or instead dominated by the large-scale properties of the host galaxy and its environment.

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