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A hard X-ray view o...
A hard X-ray view of luminous and ultra-luminous infrared galaxies in GOALS - I. AGN obscuration along the merger sequence
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- Ricci, C. (författare)
- Beijing University of Technology,Universidad Diego Portales,Diego Portales University
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- Privon, G. C. (författare)
- National Radio Astronomy Observatory
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- Pfeifle, R. W. (författare)
- George Mason University
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- Armus, L. (författare)
- California Institute of Technology (Caltech)
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- Iwasawa, K. (författare)
- Universitat de Barcelona,University of Barcelona,Institucio Catalana de Recerca i Estudis Avancats (ICREA),Catalan Institution for Research and Advanced Studies (ICREA)
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- Torres-Alba, N. (författare)
- Clemson University
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- Satyapal, S. (författare)
- George Mason University
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- Bauer, F. E. (författare)
- Space Science Institute,Pontificia Universidad Catolica de Chile,Instituto Milenio de Astrofísica,Millennium Institute of Astrophysics
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- Treister, E. (författare)
- Pontificia Universidad Catolica de Chile
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- Ho, L. C. (författare)
- Beijing University of Technology
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- Aalto, Susanne, 1964 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Arevalo, P. (författare)
- Universidad de Valparaíso,University of Valparaíso
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- Barcos-Munoz, L. (författare)
- National Radio Astronomy Observatory
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- Charmandaris, V (författare)
- Idryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH),Panepistimio Kritis,University of Crete
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- Diaz-Santos, T. (författare)
- Idryma Technologias kai Erevnas (FORTH),Foundation for Research and Technology Hellas (FORTH),Panepistimio Kritis,University of Crete
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- Evans, A. S. (författare)
- National Radio Astronomy Observatory,University of Virginia
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- Gao, T. (författare)
- Beijing Normal University
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- Inami, H. (författare)
- Hiroshima University
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- Koss, M. J. (författare)
- Eureka Scientific
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- Lansbury, G. (författare)
- European Southern Observatory Santiago
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- Linden, S. T. (författare)
- University of Massachusetts
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- Medling, A. (författare)
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D),University of Toledo
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- Sanders, D. B. (författare)
- University of Hawaii
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- Song, Y. (författare)
- University of Virginia
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- Stern, D. (författare)
- California Institute of Technology (Caltech)
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- Ueda, Y. (författare)
- Kyoto University
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- Yamada, S. (författare)
- Kyoto University
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(creator_code:org_t)
- 2021-07-19
- 2021
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 506:4, s. 5935-5950
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Abstract
Ämnesord
Stäng
- The merger of two or more galaxies can enhance the inflow of material from galactic scales into the close environments of active galactic nuclei (AGNs), obscuring and feeding the supermassive black hole (SMBH). Both recent simulations and observations of AGN in mergers have confirmed that mergers are related to strong nuclear obscuration. However, it is still unclear how AGN obscuration evolves in the last phases of the merger process. We study a sample of 60 luminous and ultra-luminous IR galaxies (U/LIRGs) from the GOALS sample observed by NuSTAR. We find that the fraction of AGNs that are Compton thick (CT;N-H >= 10(24)cm(-2) ) peaks at at a late merger stage, prior to coalescence, when the nuclei have projected separations (d(sep)) of 0.4-6 kpc. A similar peak is also observed in the median N-H [[(1.6 +/- 0.5) x 10(24) cm(-2)].]. The vast majority (85(-9)(+7) per cent)) of the AGNs in the final merger stages (d(sep) less than or similar to 10 kpc) are heavily obscured (N-H = 10(23) cm(-2)), and the median N-H of the accreting SMBHs in our sample is systematically higher than that of local hard X-ray-selected AGN, regardless of the merger stage. This implies that these objects have very obscured nuclear environments, with the gas almost completely covering the AGN in late mergers. CT AGNs tend to have systematically higher absorption-corrected X-ray luminosities than less obscured sources. This could either be due to an evolutionary effect, with more obscured sources accreting more rapidly because they have more gas available in their surroundings, or to a selection bias. The latter scenario would imply that we are still missing a large fraction of heavily obscured, lower luminosity (L2-10 less than or similar to 10(43) erg s(-1)) AGNs in U/LIRGs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
Nyckelord
- galaxies: active
- quasars: general
- galaxies: Seyfert
- infrared: galaxies
- X-rays: general
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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- Av författaren/redakt...
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Ricci, C.
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Privon, G. C.
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Pfeifle, R. W.
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Armus, L.
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Iwasawa, K.
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Torres-Alba, N.
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visa fler...
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Satyapal, S.
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Bauer, F. E.
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Treister, E.
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Ho, L. C.
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Aalto, Susanne, ...
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Arevalo, P.
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Barcos-Munoz, L.
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Charmandaris, V
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Diaz-Santos, T.
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Evans, A. S.
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Gao, T.
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Inami, H.
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Koss, M. J.
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Lansbury, G.
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Linden, S. T.
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Medling, A.
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Sanders, D. B.
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Song, Y.
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Stern, D.
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Ueda, Y.
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Yamada, S.
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