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XXL-HSC: An updated...
XXL-HSC: An updated catalogue of high-redshift (z3.5) X-ray AGN in the XMM-XXL northern field: Constraints on the bright end of the soft log N -log S
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- Pouliasis, E. (författare)
- National Observatory of Athens
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- Georgantopoulos, I. (författare)
- National Observatory of Athens
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- Ruiz, A. (författare)
- National Observatory of Athens
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- Gilli, R. (författare)
- Istituto nazionale di astrofisica (INAF)
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- Koulouridis, E. (författare)
- National Observatory of Athens
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- Akiyama, M. (författare)
- Tohoku University
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- Ueda, Y. (författare)
- Kyoto University
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- Chiappetti, L. (författare)
- Istituto nazionale di astrofisica (INAF)
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- Garrel, C. (författare)
- Université Paris-Saclay,University Paris-Saclay
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- Horellou, Cathy, 1967 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Nagao, T. (författare)
- Ehime University
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- Paltani, S. (författare)
- Université de Genève,University of Geneva
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- Pierre, M. (författare)
- Université Paris-Saclay,University Paris-Saclay
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- Toba, Y. (författare)
- Academia Sinica Taiwan,Ehime University,Kyoto University
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- Vignali, C. (författare)
- Universita di Bologna,University of Bologna,Istituto nazionale di astrofisica (INAF)
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(creator_code:org_t)
- 2022-02-18
- 2022
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 658
- Relaterad länk:
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https://research.cha... (primary) (free)
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http://arxiv.org/pdf...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- X-rays offer a reliable method to identify active galactic nuclei (AGNs). However, in the high-redshift Universe, X-ray AGNs are poorly sampled due to their relatively low space density and the small areas covered by X-ray surveys. In addition to wide-area X-ray surveys, it is important to have deep optical data in order to locate the optical counterparts and determine their redshifts. In this work, we built a high-redshift (z3.5) X-ray-selected AGN sample in the XMM-XXL northern field using the most updated [0.5-2 keV] catalogue along with a plethora of new spectroscopic and multi-wavelength catalogues, including the deep optical Subaru Hyper Suprime-Cam (HSC) data, reaching magnitude limits i 26 mag. We selected all the spectroscopically confirmed AGN and complement this sample with high-redshift candidates that are HSC g- and r-band dropouts. To confirm the dropouts, we derived their photometric redshifts using spectral energy distribution techniques. We obtained a sample of 54 high-z sources (28 with spec-z), the largest in this field so far (almost three times larger than in previous studies), and we estimated the possible contamination and completeness. We calculated the number counts (log N-log S) in different redshift bins and compared our results with previous studies and models. We provide the strongest high-redshift AGN constraints yet at bright fluxes (f0.52 keV>10 15 ergs 1 cm2). The samples of z 3.5, z4, and z5 are in agreement with an exponential decline model similar to that witnessed at optical wavelengths. Our work emphasises the importance of using wide-area X-ray surveys with deep optical data to uncover high-redshift AGNs.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- Early Universe
- Methods: statistical
- Methods: data analysis
- Methods: observational
- Galaxies: active
- X-rays: galaxies
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- Av författaren/redakt...
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Pouliasis, E.
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Georgantopoulos, ...
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Ruiz, A.
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Gilli, R.
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Koulouridis, E.
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Akiyama, M.
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visa fler...
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Ueda, Y.
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Chiappetti, L.
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Garrel, C.
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Horellou, Cathy, ...
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Nagao, T.
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Paltani, S.
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Pierre, M.
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Toba, Y.
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Vignali, C.
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