Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21330607e&link_type=abstract
American Astronomical Society, AAS Meeting #213, #306.07; Bulletin of the American Astronomical Society, Vol. 41, p.277
Astronomy and Astrophysics
Astronomy
Scientific paper
X-ray grating spectroscopy, combined with high-resolution multiwavelength imaging, are powerful tools for probing the nuclei and circumnuclear environments of AGN and elucidating the connections between accretion and outflows in active galaxies. We present the results from a new series of Chandra, XMM-Newton, and Suzaku observations of radio-loud and radio-quiet AGN, and address the following questions:
1) What are the roles of photoionization and outflows in creating the ionized kpc-scale circumnuclear environments of AGN. How does this affect the gas supply to the black hole?
2) What are the physical conditions of the accretion flow and absorption in AGN? Are there intrinsic differences between radio-loud and radio-quiet AGN, and what does this imply for the disk-jet connection?
First, we use X-ray gratings spectroscopy and imaging to provide detailed diagnostics of the spatially resolved, multiphase narrow-line regions (NLRs) in Seyfert galaxies. These AGN show a range of outflow properties, from truly radio-quiet sources to those with kpc-scale outflows. The detection of narrow RRC features and He-like triplets with the HETG and RGS spectrometers, strongly suggests that photoionization from the AGN dominates the energetics of these kpc-scale regions. However, additional constraints from VLA, HST, and Chandra imaging indicate that jets also play a significant role in governing their environments. We discuss the consequences for models that link outflows with feedback between accretion and black-hole growth.
Next, we examine the connection between accretion and jet production in AGN with new Suzaku observations. We show that radio-loud AGN systematically tend to lack the signatures of reprocessed X-ray emission from an neutral accretion disk that are commonly observed in radio-quiet sources. This has important implications for the structure of accretion flow in its inner regions and supports models in which the accretion flow plays a prominent role in the launching of jets.
Bianchi Simone
Canizares Claude
Evans Daniel A.
Gallagher Sarah
Hardcastle Martin
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