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

Abstract : 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.
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Submitted on : Sunday, July 3, 2022 - 7:29:54 AM
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N. Torres-Albà, K. Iwasawa, T. Díaz-Santos, V. Charmandaris, C. Ricci, et al.. C-GOALS. II. Chandra observations of the lower luminosity sample of nearby luminous infrared galaxies in GOALS. Astronomy and Astrophysics - A&A, EDP Sciences, 2018, 620, ⟨10.1051/0004-6361/201834105⟩. ⟨insu-03711200⟩

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