Kuraszkiewicz, Joanna and Wilkes, Belinda J. and Schmidt, Gary and Ghosh, Himel and Smith, Paul S. and Cutri, Roc and Hines, Dean and Huff, Eric M. and McDowell, Jonathan C. and Nelson, Brant (2009) The Spectral Energy Distributions of Red Two Micron All Sky Survey Active Galactic Nuclei. Astrophysical Journal, 692 (2). pp. 1143-1179. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20090917-135545525
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We present infrared (IR) to X-ray spectral energy distributions (SEDs) for 44 red active galactic nuclei (AGNs) selected from the Two Micron All Sky Survey (2MASS) survey on the basis of their red J – K_S color (>2 mag) and later observed by Chandra. In comparison with optically-, radio-, and X-ray-selected AGNs, their median SEDs are red in the optical and near-IR (NIR) with little/no blue bump. Comparison of the various broadband luminosity ratios shows that the main differences lie at the blue end of the optical and in the NIR to far-IR ratios (when available), with the red 2MASS AGNs being redder than the other samples. It thus seems that NIR color selection isolates the reddest subset of AGNs that can be classified optically. The shape of the SEDs is generally consistent with modest absorption by gas (in the X-ray) and dust (in the optical-IR), as demonstrated by comparing the optical and NIR colors with a reddened median SED and observed optical+NIR to intrinsic X-ray ratios. The levels of obscuration, estimated from X-rays, far-IR, and our detailed optical+NIR color modeling, are all consistent implying N_H ≤ few × 10^(22) cm^(–2). We present SED models that show how the AGN optical/NIR colors change due to differing amounts of reddening, AGN to host galaxy ratio, redshift, and scattered light emission, and apply them to the sources in the sample. We find that the 2MASS AGN optical color, B – R, and to a lesser extent the NIR color, J – K_S , are strongly affected by reddening, host galaxy emission, redshift, and in few, highly polarized objects also by scattered AGN light (<2% of intrinsic AGN light in the R band is scattered; this contribution becomes significant as the direct AGN light is absorbed). The lack of low equivalent widths in the distribution of the [O III] λ5007 emission line implies a predominance of inclined objects in the red 2MASS sample. The obscuration/inclination of the AGN allows us to see weaker emission components which are generally swamped by the AGN.
|Additional Information:||© 2009. The American Astronomical Society. Received 2008 March 11; accepted 2008 October 24; published 2009 February 23. We thank the referee, Gordon Richards, for comments that helped improve this paper. B.J.W. and J.K. gratefully acknowledge the financial support of NASA Chandra grants, GO1-2112A, GO3-4138A, and NASA XMM-Newton grants, NNG04GD27G, NNG05GM24G, which supported various aspects of this work.We also gratefully acknowledge the financial support of grants NAS8-39073, GO-09161.05-A (HST). P.S.S. acknowledges support from NASA/JPL contract 1256424. This publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has also made use of the NASA/IPAC Extragalactic Database (NED). SuperCOSMOS Sky Survey material is based on photographic data originating from the UK, Palomar and ESO Schmidt telescopes and is provided by the Wide-Field Astronomy Unit, Institute for Astronomy, University of Edinburgh, which is funded by the UK Particle Physics and Astronomy Research Council.|
|Subject Keywords:||galaxies: active; quasars: general|
|Official Citation:||The Spectral Energy Distributions of Red Two Micron All Sky Survey Active Galactic Nuclei Joanna Kuraszkiewicz, Belinda J. Wilkes, Gary Schmidt, Himel Ghosh, Paul S. Smith, Roc Cutri, Dean Hines, Eric M. Huff, Jonathan C. McDowell, and Brant Nelson 2009 ApJ 692 1143-1179 doi: 10.1088/0004-637X/692/2/1143|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||22 Sep 2009 19:39|
|Last Modified:||26 Dec 2012 11:24|
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