Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115604p&link_type=abstract
American Astronomical Society, AAS Meeting #211, #156.04; Bulletin of the American Astronomical Society, Vol. 39, p.1009
Mathematics
Logic
Scientific paper
Recently acquired data from the All-wavelength Extended Groth Strip International Survey (AEGIS) allow us to explore the origin of the observed relationship between the masses of stellar spheroids and the black holes inhabiting them. We describe the results of two projects which probe the relationships between active galactic nuclei (AGNs) and their host galaxies. For the first project, we select AGNs using three independent methods: X-ray luminosity, radio luminosity, and optical spectrum signatures. Morphologies (merger, E/S0/Sa, or Sb-Irr) of the host galaxies are determined by using the second moment of the light, M20, and the Gini coefficient, and close galaxy pairs containing at least one AGN are identified based on kinematics. For AGN hosts identified as kinematically and/or morphologically interacting, we estimate the stage of the interaction and compare it to the AGN energy output. This allows us to test quantitative predictions regarding the timing of galaxy interactions and AGN detectability and energy output based on simulations of merging galaxies. For the second project, we stack the X-ray emissions from a sample of morphologically interacting galaxies that are not detected as X-ray sources, in search of obscured AGNs. We compare the intrinsic X-ray luminosity of early-stage mergers to that of late-stage mergers in order to constrain the relative time-scales of AGNs and the growth of stellar spheroids. Galaxy merger simulations offer constraints on the time-scales of stellar spheroid formation, while results from this project constrain the time-scales of the early stages of AGNs. Taken together, we are beginning to answer the question - does the AGN control the growth of the stellar spheroid, or vice versa?
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