Chandra X-ray and HST Imaging of Kiloparsec-scale Binary Active Galactic Nuclei

Details Chandra X-ray and HST Imaging of Kiloparsec-scale Binary Active Galactic Nuclei Chandra X-ray and HST Imaging of Kiloparsec-scale Binary Active Galactic Nuclei

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922504l&link_type=abstract

American Astronomical Society, AAS Meeting #219, #225.04

Astronomy and Astrophysics

Astronomy

Scientific paper

Kiloparsec-scale AGN pairs denote co-rotating massive black holes (MBHs) in merging galaxies, which may hold important clues to our general understanding of massive galaxy formation, of the hierarchical merger paradigm, and of MBH mergers predicted to be the primary source of low-frequency gravitational waves. Despite their significant merit, kpc AGN pairs remained difficult to find. We developed a feasible approach to systematically identify kpc AGN pairs based on the selection of AGNs with double-peaked narrow emission lines combined with follow-up higher resolution near-infrared (NIR) imaging and spatially resolved optical spectroscopy. While our results suggest that the majority of double-peaked narrow-line AGNs are single AGNs with complex gas kinematics, at least 1/10 seem to be kpc AGN pairs. Here we present Chandra X-ray and HST imaging of four such kpc AGN pairs identified in our systematic search. We use the detection of two luminous X-ray nuclei in each galaxy to confirm the double AGN nature unambiguously. We exploit HST NIR and UV imaging to characterize host galaxy morphology and star formation activity of these merging systems in unprecedented detail.

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