C-GOALS II. Chandra Observations of the Lower Luminosity Sample of Nearby Luminous Infrared Galaxies in GOALS
| Autor: | Torres-Albà, N., Iwasawa, K., Díaz-Santos, T., Charmandaris, V., Ricci, C., Chu, J. K., Sanders, D. B., Armus, L., Barcos-Muñoz, L., Evans, A. S., Howell, J. H., Inami, H., Linden, S. T., Medling, A. M., Privon, G. C., U, V., Yoon, I. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | A&A 620, A140 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/201834105 |
| Popis: | 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 MIR selection criteria, we find AGN in (31$\pm$5)% of the galaxy sample, compared to the (38$\pm$6)% previously found for GOALS galaxies with higher infrared luminosities (C-GOALS I). Using mid-infrared data, we find that (59$\pm$9)% of the X-ray selected AGN in the full C-GOALS sample do not contribute significantly to the bolometric luminosity of the host galaxy. Dual AGN are detected in two systems, implying a dual AGN fraction in systems that contain at least one AGN of (29$\pm$14)%, compared to the (11$\pm$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 $\sim 1$ 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 $L_{\rm FIR}>8\times10^{10}$ L$_{\odot}$. Comment: 24 pages, 13 figures, 11 tables, accepted for publication in A&A |
| Databáze: | arXiv |
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