The XXL Survey

XXVII. The 3XLSS point source catalogue^★,★★

¹ INAF, IASF Milano, via Bassini 15, 20133 Milano, Italy
e-mail: lucio@lambrate.inaf.it
² Department of Astronomy, University of Geneva, ch. d’Écogia 16, 1290 Versoix, Switzerland
³ Australian Astronomical Observatory, North Ryde, NSW 2113, Australia
⁴ AIM, CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité, 91191 Gif-sur-Yvette, France
⁵ Argelander Institut für Astronomie, Universität Bonn, 53121 Bonn, Germany
⁶ Dipartimento di Fisica e Astronomia, Università di Bologna, via Gobetti 93/2, 40129 Bologna, Italy
⁷ Main Astronomical Observatory, Academy of Sciences of Ukraine, 27 Akademika Zabolotnoho St., 03680 Kyiv, Ukraine
⁸ National Observatory of Athens, Lofos Nymfon, 11810 Athens, Greece
⁹ Aristotle University of Thessaloniki, Physics Department, Thessaloniki 54124, Greece
¹⁰ Aix Marseille Univ., CNRS, CNES, LAM, Marseille, France
¹¹ Department of Astronomy and Space Sciences, Faculty of Science, Istanbul University, 34119 Istanbul, Turkey
¹² European Space Astronomy Centre (ESA/ESAC), Villanueva de la Cañada, 28692 Madrid, Spain
¹³ INAF, Osservatorio Astronomico di Roma, via Frascati 33, 00078 Monte Porzio Catone, Italy
¹⁴ School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
¹⁵ INAF, Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, 35122 Padova, Italy
¹⁶ INAF, Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, Italy
¹⁷ Laboratoire Lagrange, UMR 7293, Université de Nice Sophia Antipolis, CNRS, Observatoire de la Côte dAzur, 06304 Nice, France
¹⁸ Department of Physics, University of Zagreb, Bijenička cesta 32, 10000 Zagreb, Croatia
¹⁹ Macquarie University, Sydney, NSW 2109, Australia
²⁰ European Southern Observatory, Alonso de Cordova 3107, Vitacura, 19001 Casilla, Santiago 19, Chile
²¹ INAF, Osservatorio Astronomico di Bologna, Via Gobetti 93/3, 40129 Bologna, Italy
²² Department of Physics, University of Oxford, Oxford OX1 3PU, UK
²³ Merton College, Oxford OX1 4JD, UK
²⁴ Astrophysics Research Institute, Liverpool John Moores University, Liverpool L3 5RF, UK
²⁵ Monash University, Victoria 3800, Australia
²⁶ ICRAR, 1 Turner Avenue, Technology Park, Bentley, Western Australia, Australia
²⁷ University of St Andrews, St Andrews KY16 9AJ, UK
²⁸ Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
²⁹ Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
³⁰ IRAP, Université de Toulouse, CNRS, UPS, 31400 Toulouse, France
³¹ School of Physics and Astronomy, University of Birmingham, Birmingham B152TT, UK

Received: 1 September 2017
Accepted: 4 January 2018

Abstract

We present the version of the point source catalogue of the XXL Survey that was used, in part, in the first series of XXL papers. In this paper we release, in our database in Milan and at CDS: (i) the X-ray source catalogue with 26 056 objects in two areas of 25 deg² with a flux limit (at 3σ) of ~10⁻¹⁵ erg s⁻¹ cm⁻² in [0.5–2] keV, and ~ 3 × 10⁻¹⁵ erg s⁻¹ cm⁻² in [2–10] keV, yielding a 90% completeness limit of 5.8 × 10⁻¹⁵ and 3.8 × 10⁻¹⁴ respectively;(ii) the associated multiwavelength catalogues with candidate counterparts of the X-ray sources in the infrared, near-infrared, optical, and ultraviolet (plus spectroscopic redshift when available); and (iii) a catalogue of spectroscopic redshifts recently obtained in the southern XXL area. We also present the basic properties of the X-ray point sources and their counterparts. Other catalogues described in the second series of XXL papers will be released contextually, and will constitute the second XXLdata release.