Astronomy and Astrophysics, volume 620A, 140-140 (2018/12-1)
C-GOALS. II. Chandra observations of the lower luminosity sample of nearby luminous infrared galaxies in GOALS.
TORRES-ALBA N., IWASAWA K., DIAZ-SANTOS T., CHARMANDARIS V., RICCI C., CHU J.K., SANDERS D.B., ARMUS L., BARCOS-MUNOZ L., EVANS A.S., HOWELL J.H., INAMI H., LINDEN S.T., MEDLING A.M., PRIVON G.C., U V. and YOON I.
Abstract (from CDS):
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 ∼1kpc. 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>8x1010L☉.
© ESO 2018
infrared: galaxies - X-rays: galaxies - galaxies: active - galaxies: starburst
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