Volume 620, December 2018
|Number of page(s)||66|
|Published online||11 December 2018|
II. Chandra observations of the lower luminosity sample of nearby luminous infrared galaxies in GOALS
1 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 Institute for Astronomy, Astrophysics, Space Applications & Remote Sensing, National Observatory of Athens, 15236 Penteli, Greece
5 University of Crete, Department of Physics, 71003 Heraklion, Greece
6 Kavli Institute for Astronomy and Astrophysics, Peking University, 100871 Beijing, PR China
7 Chinese Academy of Sciences South America Center for Astronomy, Camino El Observatorio 1515, Las Condes, Santiago, Chile
8 Gemini North Observatory, 670 N. A’ohoku Place, Hilo, HI, 96720, USA
9 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI, 96822, USA
10 Infrared Processing and Analysis Center, MC 314-6, Caltech, 1200 E. California Blvd., Pasadena, CA, 91125, USA
11 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA, 22903, USA
12 Joint ALMA Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile
13 Department of Astronomy, University of Virginia, PO Box 400325 Charlottesville, VA, 22904, USA
14 Univ Lyon, Univ Lyon1, ENS de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon (CRAL) UMR5574, 69230 Saint Genis-Laval, France
15 Cahill Center for Astronomy and Astrophysics, California Institute of Technology, MS 249-17, Pasadena, CA, 91125, USA
16 Research School of Astronomy & Astrophysics, Australian National University, ACT 2611 Canberra, Australia
17 Department of Astronomy, University of Florida, 211 Bryant Space Sciences Center, Gainesville, FL, 32611, USA
18 Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, CA, 92697, USA
Accepted: 2 October 2018
We analyze Chandra X-ray observatory data for a sample of 63 luminous infrared galaxies (LIRGs), sampling the lower-infrared luminosity range of the Great Observatories All-Sky LIRG survey (GOALS), which includes the most luminous infrared selected galaxies in the local Universe. X-rays are detected for 84 individual galaxies within the 63 systems, for which arcsecond resolution X-ray images, fluxes, infrared and X-ray luminosities, spectra and radial profiles are presented. Using X-ray and mid-infrared (MIR) selection criteria, we find AGN in (31 ± 5)% of the galaxy sample, compared to the (38 ± 6)% previously found for GOALS galaxies with higher infrared luminosities (C-GOALS I). Using MIR data, we find that (59 ± 9)% of the X-ray selected AGN in the full C-GOALS sample do not contribute significantly to the bolometric luminosity of the host galaxy. Dual AGN are detected in two systems, implying a dual AGN fraction in systems that contain at least one AGN of (29 ± 14)%, compared to the (11 ± 10)% found for the C-GOALS I sample. Through analysis of radial profiles, we derive that most sources, and almost all AGN, in the sample are compact, with half of the soft X-ray emission generated within the inner ∼1 kpc. For most galaxies, the soft X-ray sizes of the sources are comparable to those of the MIR emission. We also find that the hard X-ray faintness previously reported for the bright C-GOALS I sources is also observed in the brightest LIRGs within the sample, with LFIR > 8 × 1010 L⊙.
Key words: infrared: galaxies / X-rays: galaxies / galaxies: active / galaxies: starburst
© ESO 2018
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