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Title:
1.75 h -1 kpc Separation Dual Active Galactic Nuclei at z = 0.36 in the Cosmos Field
Authors:
Comerford, Julia M.; Griffith, Roger L.; Gerke, Brian F.; Cooper, Michael C.; Newman, Jeffrey A.; Davis, Marc; Stern, Daniel
Affiliation:
AA(Astronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720, USA ), AB(Jet Propulsion Laboratory, California Institute of Technology, MS 169-327, 4800 Oak Grove Drive, Pasadena, CA 91109, USA ), AC(Kavli Institute for Particle Astrophysics and Cosmology, M/S 29, Stanford Linear Accelerator Center, 2575 Sand Hill Rd., Menlo Park, CA 94725, USA ), AD(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ; Spitzer fellow.), AE(Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA ), AF(Astronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720, USA ; Department of Physics, University of California, Berkeley, CA 94720, USA ), AG(Jet Propulsion Laboratory, California Institute of Technology, MS 169-327, 4800 Oak Grove Drive, Pasadena, CA 91109, USA )
Publication:
The Astrophysical Journal Letters, Volume 702, Issue 1, pp. L82-L86 (2009). (ApJL Homepage)
Publication Date:
09/2009
Origin:
IOP
ApJ Keywords:
galaxies: active, galaxies: individual: COSMOS J100043.15+020637.2, galaxies: interactions, galaxies: nuclei
DOI:
10.1088/0004-637X/702/1/L82
Bibliographic Code:
2009ApJ...702L..82C

Abstract

We present strong evidence for dual active galactic nuclei (AGNs) in the z = 0.36 galaxy COSMOS J100043.15+020637.2. COSMOS Hubble Space Telescope (HST) imaging of the galaxy shows a tidal tail, indicating that the galaxy recently underwent a merger, as well as two bright point sources near the galaxy's center. The luminosities of these sources (derived from the HST image) and their emission line flux ratios (derived from Keck/DEIMOS slit spectroscopy) suggest that both are AGNs and not star-forming regions or supernovae. Observations from zCOSMOS, the Sloan Digital Sky Survey, XMM-Newton, Spitzer, and the Very Large Array fortify the evidence for AGN activity. With HST imaging we measure a projected spatial offset between the two AGNs of 1.75 ± 0.03 h -1 kpc, and with DEIMOS we measure a 150 ± 40 km s-1 line-of-sight velocity offset between the two AGNs. Combined, these observations provide substantial evidence that COSMOS J100043.15+020637.2 is a merger-remnant galaxy with dual AGNs.
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