Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915414c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #154.14
Mathematics
Logic
Scientific paper
Black hole and galaxy co-evolution models predict a phase in which multiple galaxies with active black holes interact, with visible signatures of interaction, and that their activity may be stimulated by tidal disruptions of their ISM. Several studies have been recently conducted to prove the existence of this phase. However, a proper multiwavelength characterization of galaxy pairs is still missing. We present analysis of X-ray emitting galaxy pairs selected in the Chandra COSMOS survey. The sources in each pair are within a redshift difference of 0.2 and a projected separation of 10 arcseconds, corresponding to projected physical separations ranging from 27 kpc to 82 kpc. In order to characterize the pairs in the context of the black hole/galaxy co-evolution scenario, we i) fit spectral energy distributions to determine the relative AGN and galaxy contributions, ii) calculated X-ray luminosities and hardness ratios to check the active nature of the black holes and to get a sense of the obscuration levels, iii) examined the morphologies for signatures of mergers, and iv) determined relative velocities from available spectra. Active black holes are present in all of the galaxies, as they are very luminous in the X-ray band, though mildly obscured. In most of the sources, the host galaxy out shines the nuclear light in the optical band. In several lower redshift pairs, where morphological features are more easily observed, we see disturbed morphology and tidal structures, signatures of a first close passage. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.
Aldcroft Thomas L.
Civano Francesca
Cunningham Emily C.
Elvis Martin
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