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NuSTAR Observations of WISE J1036+0449, A Galaxy at Z Approx. 1 Obscured by Hot DustHot dust-obscured galaxies (hot DOGs), selected from Wide-Field Infrared Survey Explorer's all-sky infrared survey, host some of the most powerful active galactic nuclei known and may represent an important stage in the evolution of galaxies. Most known hot DOGs are located at z > 1.5, due in part to a strong bias against identifying them at lower redshift related to the selection criteria. We present a new selection method that identifies 153 hot DOG candidates at z approx. 1, where they are significantly brighter and easier to study. We validate this approach by measuring a redshift z = 1.009 and finding a spectral energy distribution similar to that of higher-redshift hot DOGs for one of these objects, WISE J1036+0449 (L(BOL) approx. = 8 x 10(exp 46) erg/s). We find evidence of a broadened component in Mg II, which would imply a black hole mass of M(BH) approx. = 2 x 10(exp 8) Stellar Mass and an Eddington ratio of lambda(Edd) approx. = 2.7. WISE J1036+0449 is the first hot DOG detected by the Nuclear Spectroscopic Telescope Array, and observations show that the source is heavily obscured, with a column density of N(H) approx. = (2-15) x 10(exp 23)/sq cm. The source has an intrinsic 2-10 keV luminosity of approx. 6 x 10(exp 44) erg/s, a value significantly lower than that expected from the mid-infrared X-ray correlation. We also find that other hot DOGs observed by X-ray facilities show a similar deficiency of X-ray flux. We discuss the origin of the X-ray weakness and the absorption properties of hot DOGs. Hot DOGs at z < or approx. 1 could be excellent laboratories to probe the characteristics of the accretion flow and of the X-ray emitting plasma at extreme values of the Eddington ratio.
Document ID
20170006058
Document Type
Reprint (Version printed in journal)
Authors
Ricci, C. (Peking Univ. Beijing, China)
Assef, R. J. (Diego Portales Univ. Santiago, Chile)
Stern, D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Nikutta, R. (National Optical Astronomy Observatories Tucson, AZ, United States)
Alexander, D. M. (Durham Univ. United Kingdom)
Asmus, D. (European Southern Observatory Santiago, Chile)
Ballantyne, D. R. (Georgia Inst. of Tech. Atlanta, GA, United States)
Bauer, F. E. (Space Science Inst. Boulder, CO, United States)
Blain, A. W. (Leicester Univ. United Kingdom)
Boggs, S. (California Univ. Berkeley, CA, United States)
Boorman, P. G. (Southampton Univ. Highfield, United Kingdom)
Brandt, W. N. (Pennsylvania State Univ. University Park, PA, United States)
Brightman, M. (California Inst. of Tech. Pasadena, CA, United States)
Chang, C. S. (Joint ALMA Observatory Santiago, Chile)
Chen, C.-T. J. (Pennsylvania State Univ. University Park, PA, United States)
Christensen, F. E. (Technical Univ. of Denmark Lyngby, Denmark)
Comastri, A. (Osservatorio Astronomico Bologna, Italy)
Craig, W. W. (California Univ. Berkeley, CA, United States)
Díaz-Santos, T. (Diego Portales Univ. Santiago, Chile)
Eisenhardt, P. R. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Farrah, D. (Virginia Tech Blacksburg, VA, United States)
Gandhi, P. (Southampton Univ. Highfield, United Kingdom)
Hailey, C. J. (Columbia Univ. New York, NY, United States)
Harrison, F. A. (California Inst. of Tech. Pasadena, CA, United States)
Jun, H. D. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Koss, M. J. (Eidgenoessische Technische Hochschule Zurich, Switzerland)
LaMassa, S. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Lansbury, G. B. (Durham Univ. United Kingdom)
Markwardt, C. B. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Stalevski, M. (Ghent Univ. Belgium)
Stanley, F. (Durham Univ. United Kingdom)
Treister, E. (Universidad Catolica de Chile Santiago, Chile)
Tsai, C.-W. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Walton, D. J. (California Inst. of Tech. Pasadena, CA, United States)
Wu, J. W. (Academia Sinica Beijing, China)
Zappacosta, L. (Osservatorio Astronomico Rome, Italy)
Zhang, W. W. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
July 3, 2017
Publication Date
January 20, 2017
Publication Information
Publication: The Astrophysical Journal
Volume: 835
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN43991
GSFC-E-DAA-TN43746
Distribution Limits
Public
Copyright
Other
Keywords
galaxies