Volume 640, August 2020
|Number of page(s)||7|
|Published online||19 August 2020|
A Compton-thick nucleus in the dual active galactic nuclei of Mrk 266
Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (IEEC-UB), Martí i Franquès, 1, 08028 Barcelona, Spain
2 ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
3 Núcleo de Astronomía de la Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejército Libertador 441, Santiago, Chile
4 Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, PR China
5 Department of Physics and Astronomy, George Mason University, MS 3F3, 4400 University Drive, Fairfax, VA 22030, USA
6 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
7 Department of Astronomy, University of Florida, PO Box 112055 Gainesville, FL 32611, USA
8 Department of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634, USA
9 Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
10 Department of Physics, University of Crete, 71003 Heraklion, Greece
11 Institute of Astrophysics, Foundation for Research and Technology–Hellas, Heraklion 70013, Greece
12 Department of Astronomy, University of Virginia, PO Box 400325 Charlottesville, VA 22904, USA
13 IPAC, MC 100-22, California Institute of Technology, Pasadena, CA 91125, USA
14 Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, PR China
Accepted: 6 July 2020
We present the results from our analysis of NuSTAR data of the luminous infrared galaxy Mrk 266, which contains two nuclei, south-western (SW) and north-eastern (NE), which were resolved in previous Chandra imaging. Combining this with the Chandra data, we intepret the hard X-ray spectrum obtained from a NuSTAR observation to result from a steeply rising flux from a Compton-thick active galactic nuclei (AGN) in the SW nucleus which is very faint in the Chandra band, confirming the previous claim. This hard X-ray component is dominated by reflection, and its intrinsic 2–10 keV luminosity is likely to be ∼1 × 1043 erg s−1. Although it is bright in soft X-ray, only a moderately absorbed NE nucleus has a 2–10 keV luminosity of 4 × 1041 erg s−1, placing it in the low-luminosity AGN class. These results have implications for understanding the detectability and duty cycles of emission from dual AGN in heavily obscured mergers.
Key words: galaxies: active / galaxies: individual: Mrk 266 / X-rays: galaxies
© ESO 2020
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