Herschel-ATLAS: first data release of the Science Demonstration Phase source catalogues

Rigby, E. E.; Maddox, S. J.; Dunne, L.; Negrello, M.; Smith, D. J. B.; González-Nuevo, J.; Herranz, D.; López-Caniego, M.; Auld, R.; Buttiglione, S.; Baes, M.; Cava, A.; Cooray, A.; Clements, D. L.; Dariush, A.; De Zotti, G.; Dye, S.; Eales, S.; Frayer, D.; Fritz, J.; Hopwood, R.; Ibar, E.; Ivison, R. J.; Jarvis, M.; Panuzzo, P.; Pascale, E.; Pohlen, M.; Rodighiero, G.; Serjeant, S.; Temi, P. and Thompson, M. A. (2011). Herschel-ATLAS: first data release of the Science Demonstration Phase source catalogues. Monthly Notices of the Royal Astronomical Society, 415(3) pp. 2336–2348.

DOI: https://doi.org/10.1111/j.1365-2966.2011.18864.x

Abstract

The Herschel Astrophysical Terahertz Large Area Survey (Herschel-ATLAS) is a survey of 550 deg² with the Herschel Space Observatory in five far-infrared and submillimetre bands. The first data for the survey, observations of a field 4 × 4 deg² in size, were taken during the Science Demonstration Phase (SDP), and reach a 5σ noise level of 33.5 mJy beam⁻¹ at 250 μm. This paper describes the source extraction methods used to create the corresponding SDP catalogue, which contains 6876 sources, selected at 250 μm, within ∼14 deg². Spectral and Photometric Imaging REciever (SPIRE) sources are extracted using a new method specifically developed for Herschel data and Photodetector Array Camera and Spectrometer (PACS) counterparts of these sources are identified using circular apertures placed at the SPIRE positions. Aperture flux densities are measured for sources identified as extended after matching to optical wavelengths. The reliability of this catalogue is also discussed, using full simulated maps at the three SPIRE bands. These show that a significant number of sources at 350 and 500 μm have undergone flux density enhancements of up to a factor of ∼2, due mainly to source confusion. Correction factors are determined for these effects. The SDP data set and corresponding catalogue will be available from http://www.h-atlas.org.

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About

• Item ORO ID
• 31717
• Item Type
• Journal Item
• ISSN
• 1365-2966
• Keywords
• methods; data analysis; catalogues; surveys; galaxies; general; submillimetre; galaxies
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Space
• Copyright Holders
• © 2011 RAS, © 2011 The Authors
• Depositing User
• Stephen Serjeant