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THE CHANDRA COSMOS-...
THE CHANDRA COSMOS-LEGACY SURVEY : SOURCE X-RAY SPECTRAL PROPERTIES
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- Marchesi, S. (författare)
- Clemson University,INAF Osservatorio Astronomico di Bologna
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- Lanzuisi, G. (författare)
- INAF Osservatorio Astronomico di Bologna,University of Bologna
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- Civano, F. (författare)
- Harvard–Smithsonian Center for Astrophysics
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- Iwasawa, K. (författare)
- University of Barcelona
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- Suh, H. (författare)
- University of Hawai'i at Hilo
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- Comastri, A. (författare)
- INAF Osservatorio Astronomico di Bologna
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- Zamorani, G. (författare)
- INAF Osservatorio Astronomico di Bologna
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- Allevato, V. (författare)
- University of Helsinki
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- Griffiths, R. (författare)
- University of Hawai'i at Hilo
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- Miyaji, T. (författare)
- National Autonomous University of Mexico
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- Ranalli, P. (författare)
- Lund University,Lunds universitet,Astronomi - Har omorganiserats,Institutionen för astronomi och teoretisk fysik - Har omorganiserats,Naturvetenskapliga fakulteten,Lund Observatory - Has been reorganised,Department of Astronomy and Theoretical Physics - Has been reorganised,Faculty of Science
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- Salvato, M. (författare)
- Max Planck Institute for Extraterrestrial Physics
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- Schawinski, K. (författare)
- ETH Zürich
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- Silverman, J. (författare)
- University of Tokyo
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- Treister, E. (författare)
- University of Concepción,Pontifical Catholic University of Chile
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- Urry, C. M. (författare)
- Yale University
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- Vignali, C. (författare)
- INAF Osservatorio Astronomico di Bologna,University of Bologna
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(creator_code:org_t)
- 2016
- 2016
- Engelska.
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Ingår i: Astrophysical Journal. - 0004-637X. ; 830:2
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We present the X-ray spectral analysis of the 1855 extragalactic sources in the Chandra COSMOS-Legacy survey catalog having more than 30 net counts in the 0.5-7 keV band. A total of 38% of the sources are optically classified type 1 active galactic nuclei (AGNs), 60% are type 2 AGNs, and 2% are passive, low-redshift galaxies. We study the distribution of AGN photon index Γ and of the intrinsic absorption based on the sources' optical classification: type 1 AGNs have a slightly steeper mean photon index Γ than type 2 AGNs, which, on the other hand, have average times higher than type 1 AGNs. We find that ∼15% of type 1 AGNs have cm-2, i.e., are obscured according to the X-ray spectral fitting; the vast majority of these sources have 1044 erg s-1. The existence of these objects suggests that optical and X-ray obscuration can be caused by different phenomena, the X-ray obscuration being, for example, caused by dust-free material surrounding the inner part of the nuclei. Approximately 18% of type 2 AGNs have cm-2, and most of these sources have low X-ray luminosities (L2-10keV < 1043 erg s-1). We expect a part of these sources to be low-accretion, unobscured AGNs lacking broad emission lines. Finally, we also find a direct proportional trend between and host-galaxy mass and star formation rate, although part of this trend is due to a redshift selection effect.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: active
- galaxies: nuclei
- X-rays: galaxies
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Marchesi, S.
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Lanzuisi, G.
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Civano, F.
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Iwasawa, K.
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Suh, H.
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Comastri, A.
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Zamorani, G.
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Allevato, V.
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Griffiths, R.
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Miyaji, T.
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Ranalli, P.
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Salvato, M.
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Schawinski, K.
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Silverman, J.
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Treister, E.
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Urry, C. M.
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Vignali, C.
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