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C-GOALS - II. Chandra observations of the lower luminosity sample of nearby luminous infrared galaxies in GOALS

Torres-Albà, N. and Iwasawa, K. and Díaz-Santos, T. and Charmandaris, V. and Ricci, C. and Chu, J. K. and Sanders, D. B. and Armus, L. and Barcos-Muñoz, L. and Evans, A. S. and Howell, J. H. and Inami, H. and Linden, S. T. and Medling, A. M. and Privon, G. C. and U, V. and Yoon, I. (2018) C-GOALS - II. Chandra observations of the lower luminosity sample of nearby luminous infrared galaxies in GOALS. Astronomy and Astrophysics, 620 . Art. No. A140. ISSN 0004-6361.

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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 × 10^(10) L_⊙.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Iwasawa, K.0000-0002-4923-3281
Díaz-Santos, T.0000-0003-0699-6083
Charmandaris, V.0000-0002-2688-1956
Ricci, C.0000-0001-5231-2645
Chu, J. K.0000-0003-3955-2470
Sanders, D. B.0000-0002-1233-9998
Armus, L.0000-0003-3498-2973
Barcos-Muñoz, L.0000-0003-0057-8892
Evans, A. S.0000-0003-2638-1334
Inami, H.0000-0003-4268-0393
Linden, S. T.0000-0002-1000-6081
Medling, A. M.0000-0001-7421-2944
Privon, G. C.0000-0003-3474-1125
U, V.0000-0002-1912-0024
Additional Information:© ESO 2018. Received 18 August 2018 / Accepted 2 October 2018. We thank the anonymous referee for helpful comments and suggestions. We acknowledge support by the Spanish Ministerio de Economía y Competitividad (MINECO/FEDER, UE) under grants AYA2013-47447-C3-1-P and MDM-2014-0369 of ICCUB (Unidad de Excelencia “María de Maeztu”). N.T-A. acknowledges support from MINECO through FPU14/04887 grant. T.D.-S. acknowledges support from ALMA-CONICYT project 31130005 and FONDECYT regular project 1151239. G.C.P. acknowledges support from the University of Florida. This work was conducted in part at the Aspen Center for Physics, which is supported by NSF grant PHY-1607611; V.U., G.C.P, D.B.S., A.M.M., T.D-S. and A.S.E. thank the Center for its hospitality during the Astrophysics of Massive Black Holes Mergers workshop in June and July 2018. The scientific results reported in this article are based on observations made by Chandra X-ray Observatory, and has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology under contract with NASA. We acknowledge the use of the software packages CIAO and HEASoft.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ministerio de Economía y Competitividad (MINECO)AYA2013-47447-C3-1-P
Ministerio de Economía y Competitividad (MINECO)MDM-2014-0369
Fondo Europeo de Desarrollo Regional (FEDER)UNSPECIFIED
Ministerio de Economía y Competitividad (MINECO)FPU14/04887
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)31130005
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1151239
University of FloridaUNSPECIFIED
Subject Keywords:infrared: galaxies / X-rays: galaxies / galaxies: active / galaxies: starburst
Record Number:CaltechAUTHORS:20190102-155139973
Persistent URL:
Official Citation:C-GOALS - II. Chandra observations of the lower luminosity sample of nearby luminous infrared galaxies in GOALS N. Torres-Albà, K. Iwasawa, T. Díaz-Santos, V. Charmandaris, C. Ricci, J. K. Chu, D. B. Sanders, L. Armus, L. Barcos-Muñoz, A. S. Evans, J. H. Howell, H. Inami, S. T. Linden, A. M. Medling, G. C. Privon, V. U and I. Yoon A&A, 620 (2018) A140 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92019
Deposited By: George Porter
Deposited On:03 Jan 2019 19:41
Last Modified:03 Oct 2019 20:40

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