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Sökning: WFRF:(Arnouts S.) > (2016) > The XXL Survey VI. ...

  • Fotopoulou, S.Université de Genève,University of Geneva (författare)

The XXL Survey VI. The 1000 brightest X-ray point sources

  • Artikel/kapitelEngelska2016

Förlag, utgivningsår, omfång ...

  • 2016-06-15
  • EDP Sciences,2016
  • electronicrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:7c5fc2c9-c7f4-4e93-ad19-745cab561e4c
  • https://research.chalmers.se/publication/245632URI
  • https://doi.org/10.1051/0004-6361/201527402DOI
  • https://lup.lub.lu.se/record/a158e5f5-1416-42c0-b822-abb379ffbc13URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:for swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • Context. X-ray extragalactic surveys are ideal laboratories for the study of the evolution and clustering of active galactic nuclei (AGN). Usually, a combination of deep and wide surveys is necessary to create a complete picture of the population. Deep X-ray surveys provide the faint population at high redshift, while wide surveys provide the rare bright sources. Nevertheless, very wide area surveys often lack the ancillary information available for modern deep surveys. The XXL survey spans two fields of a combined 50 deg(2) observed for more than 6Ms with XMM-Newton, occupying the parameter space that lies between deep surveys and very wide area surveys; at the same time it benefits from a wealth of ancillary data. Aims. This paper marks the first release of the XXL point source catalogue including four optical photometry bands and redshift estimates. Our sample is selected in the 2-10 keV energy band with the goal of providing a sizable sample useful for AGN studies. The limiting flux is F2-10 keV = 4.8 x 10(14) erg s(-1) cm(-2). Methods. We use both public and proprietary data sets to identify the counterparts of the X-ray point-like sources by means of a likelihood ratio test. We improve upon the photometric redshift determination for AGN by applying a Random Forest classification trained to identify for each object the optimal photometric redshift category (passive, star forming, starburst, AGN, quasi-stellar objects (QSO)). Additionally, we assign a probability to each source that indicates whether it might be a star or an outlier. We apply Bayesian analysis to model the X-ray spectra assuming a power-law model with the presence of an absorbing medium. Results. We find that the average unabsorbed photon index is = 1.85 +/- 0.40 while the average hydrogen column density is log i = 21.07 +/- 1.2 cm(-2). We find no trend of Gamma or N-H with redshift and a fraction of 26% absorbed sources (log N-H > 22) consistent with the literature on bright sources (log L-x > 44). The counterpart identification rate reaches 96.7% for sources in the northern field, 97.7% for the southern field, and 97.2% in total. The photometric redshift accuracy is 0.095 for the full XMM-XXL with 28% catastrophic outliers estimated on a sample of 339 sources. Conclusions. We show that the XXL-1000-AGN sample number counts extended the number counts of the COSMOS survey to higher fluxes and are fully consistent with the Euclidean expectation. We constrain the intrinsic luminosity function of AGN in the 2-10 keV energy band where the unabsorbed X-ray flux is estimated from the X-ray spectral fit up to z = 3. Finally, we demonstrate the presence of a supercluster size structure at redshift 0.14, identified by means of percolation analysis of the XXL-1000-AGN sample. The XXL survey, reaching a medium flux limit and covering a wide area, is a stepping stone between current deep fields and planned wide area surveys.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Pacaud, F.Universität Bonn,University of Bonn (författare)
  • Paltani, S.Université de Genève,University of Geneva (författare)
  • Ranalli, P.Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,National Observatory of Athens(Swepub:lu)astr-pri (författare)
  • Ramos-Ceja, M. E.Universität Bonn,University of Bonn (författare)
  • Faccioli, L.Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA),Saclay Nuclear Research Centre (CEA Saclay) (författare)
  • Plionis, M.National Observatory of Athens,Aristotelio Panepistimio Thessalonikis,Aristotle University of Thessaloniki,Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE) (författare)
  • Adami, C.Laboratoire d'Astrophysique de Marseille,Aix-Marseille University (författare)
  • Bongiorno, A.Osservatorio Astronomico di Roma,INAF-Osservatorio Astronomico di Roma (författare)
  • Brusa, M.Osservatorio Astronomico Di Bologna,Universita di Bologna,University of Bologna,INAF Osservatorio Astronomico di Bologna (författare)
  • Chiappetti, L.Istituto nazionale di astrofisica (INAF),INAF Institute of Space Astrophysics and Cosmic Physics of Milano (författare)
  • Desai, S.Ludwig-Maximilians-Universität München,Ludwig Maximilian University of Munich,Ludwig-Maximilian University of Munich (författare)
  • Elyiv, A.Universita di Bologna,University of Bologna,Main Astronomical Observatory Nasu,National Academy of Sciences of Ukraine (författare)
  • Lidman, C.Australian Astronomical Observatory (författare)
  • Melnyk, O.Taras Shevchenko National University of Kyiv,Sveučilište u Zagrebu,University of Zagreb,Macquarie University, Sydney (författare)
  • Pierre, M.Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA),Saclay Nuclear Research Centre (CEA Saclay) (författare)
  • Piconcelli, E.Osservatorio Astronomico di Roma,INAF-Osservatorio Astronomico di Roma (författare)
  • Vignali, C.Universita di Bologna,University of Bologna,Osservatorio Astronomico Di Bologna,INAF Osservatorio Astronomico di Bologna (författare)
  • Alis, S.Istanbul Universitesi,Istanbul University,University of California, Davis (författare)
  • Ardila, F.University of Florida (författare)
  • Arnouts, S.Laboratoire d'Astrophysique de Marseille,Laboratoire d'Astrophysique de Marseille (LAM) (författare)
  • Baldry, I.Liverpool John Moores University (författare)
  • Bremer, M.University of Bristol (författare)
  • Eckert, D.Université de Genève,University of Geneva (författare)
  • Guennou, L.University of KwaZulu-Natal (författare)
  • Horellou, Cathy,1967Chalmers University of Technology(Swepub:cth)horellou (författare)
  • Iovino, A.Istituto nazionale di astrofisica (INAF),INAF Osservatorio Astronomico di Brera (författare)
  • Koulouridis, E.Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA),National Observatory of Athens,Saclay Nuclear Research Centre (CEA Saclay) (författare)
  • Liske, J.Universität Hamburg,University of Hamburg (författare)
  • Maurogordato, S.Université Nice Sophia Antipolis (UNS),Université Nice Sophia Antipolis (författare)
  • Menanteau, F.University of Illinois,University of Illinois at Urbana-Champaign (författare)
  • Mohr, J. J.Ludwig-Maximilians-Universität München,Ludwig Maximilian University of Munich,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Max Planck Institute for Extraterrestrial Physics,Ludwig-Maximilian University of Munich (författare)
  • Owers, M.Australian Astronomical Observatory,Macquarie University (författare)
  • Poggianti, B.Istituto nazionale di astrofisica (INAF),INAF - Osservatorio Astronomico di Padova (författare)
  • Pompei, E.European Southern Observatory Santiago (författare)
  • Sadibekova, T.Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA),The French Alternative Energies and Atomic Energy Commission (CEA),Saclay Nuclear Research Centre (CEA Saclay) (författare)
  • Stanford, A.University of California (författare)
  • Tuffs, R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Max Planck Institute for Nuclear Physics (författare)
  • Willis, J.University of Victoria (författare)
  • Université de GenèveUniversity of Geneva (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP Sciences592:A50004-63611432-0746

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