Herschel-ATLAS: Planck sources in the phase 1 fields^⋆

¹ Instituto de Física de Cantabria (CSIC-UC), Avda. los Castros s/n, 39005 Santander, Spain
e-mail: herranz@ifca.unican.es
² Astrophysics Group, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK
³ Astrophysics Sector, SISSA, via Bonomea 265, 34136 Trieste, Italy
⁴ Astrophysics Group, Imperial College, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, UK
⁵ INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
⁶ Dipartimento di Fisica, Università di Roma Tor Vergata, via Ricerca Scientifica 1, 00133 Roma, Italy
⁷ Dip. Astronomia, Univ. di Padova, Vicolo dell’Osservatorio 3, 35122 Padova, Italy
⁸ Department of Physics and Astronomy, Frederick Reines Hall, University of California, Irvine, CA 92697–4575, USA
⁹ Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, 9000 Gent, Belgium
¹⁰ UK ALMA Regional Centre Node, Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
¹¹ Institut d’Astrophysique Spatiale (IAS), Bât. 121, Université Paris-Sud 11 and CNRS (UMR 8617), 91405 Orsay, France
¹² Cardiff School of Physics and Astronomy, Cardiff University, Queens Building, The Parade, Cardiff, CF24 3AA, UK
¹³ UK Astronomy Technology Centre, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
¹⁴ SUPA, Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh, EH9 3HJ, UK ^⋆⋆
15 Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, Hatfield, Herts, AL10 9AB, UK
¹⁶ Physics Department, University of the Western Cape, Cape Town, 7535, South Africa
¹⁷ INAF-Istituto di Radioastronomia, via Gobetti 101, 40129 Bologna, Italy
¹⁸ Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
¹⁹ Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, Canada
²⁰ Herschel Science Centre, ESAC, ESA, PO Box 78, Villanueva de la Cañada, 28691 Madrid, Spain
²¹ School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK

Received: 17 April 2012
Accepted: 4 October 2012

Abstract

We present the results of a cross-correlation of the Planck Early Release Compact Source catalogue (ERCSC) with the catalogue of Herschel-ATLAS sources detected in the phase 1 fields, covering 134.55   deg². There are 28 ERCSC sources detected by Planck at 857 GHz in this area. As many as 16 of them are probably high Galactic latitude cirrus; 10 additional sources can be clearly identified as bright, low-z galaxies; one further source is resolved by Herschel as two relatively bright sources; and the last is resolved into an unusual condensation of low-flux, probably high-redshift point sources, around a strongly lensed Herschel-ATLAS source at z = 3.26. Our results demonstrate that the higher sensitivity and higher angular resolution H-ATLAS maps provide essential information for the interpretation of candidate sources extracted from Planck sub-mm maps.