The second Herschel-ATLAS Data Release - III: optical and near-infrared counterparts in the North Galactic Plane field

Abstract

This paper forms part of the second major public data release of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). In this work, we describe the identification of optical and near-infrared counterparts to the submillimetre detected sources in the $177$ deg${}^2$ North Galactic Plane (NGP) field. We used the likelihood ratio method to identify counterparts in the Sloan Digital Sky Survey and in the UKIRT Imaging Deep Sky Survey within a search radius of $10$ arcsec of the H-ATLAS sources with a $4\sigma$ detection at $250\mu$m. We obtained reliable ($R\ge 0.8$) optical counterparts with $r<22.4$ for 42429 H-ATLAS sources ($37.8$ per cent), with an estimated completeness of $71.7$ per cent and a false identification rate of $4.7$ per cent. We also identified counterparts in the near-infrared using deeper $K$-band data which covers a smaller $\sim 25$ deg${}^2$. We found reliable near-infrared counterparts to $61.8$ per cent of the $250$-$\mu$m-selected sources within that area. We assessed the performance of the likelihood ratio method to identify optical and near-infrared counterparts taking into account the depth and area of both input catalogues. Using catalogues with the same surface density of objects in the overlapping $\sim 25$ deg${}^2$ area, we obtained that the reliable fraction in the near-infrared ($54.8$ per cent) is significantly higher than in the optical ($36.4$ per cent). Finally, using deep radio data which covers a small region of the NGP field, we found that $80-90$ per cent of our reliable identifications are correct.

arXiv comment19 pages, 24 figures, submitted to MNRAS

References in corpus (30)

• The Seventh Data Release of the Sloan Digital Sky Survey
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Galaxy and Mass Assembly (GAMA): survey diagnostics and core data release
• The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
• The Herschel ATLAS
• Galaxy And Mass Assembly (GAMA): end of survey report and data release 2
• The SCUBA HAlf Degree Extragalactic Survey (SHADES) - III. Identification of radio and mid-infrared counterparts to submillimetre galaxies
• The far-infrared/radio correlation as probed by Herschel
• The UKIRT Infrared Deep Sky Survey Early Data Release
• The Herschel-ATLAS Data Release 1 Paper I: Maps, Catalogues and Number Counts
• The XMM-Newton wide-field survey in the COSMOS field: III. optical identification and multiwavelength properties of a large sample of X-ray selected sources
• Deep multi-frequency radio imaging in the Lockman Hole using the GMRT and VLA: I. The nature of the sub-mJy radio population
• A deep VLA survey at 6 cm in the Lockman Hole
• Herschel-ATLAS: counterparts from the UV--NIR in the science demonstration phase catalogue
• Herschel-ATLAS: First data release of the Science Demonstration Phase source catalogues
• A joint analysis of BLAST 250--500um and LABOCA 870um observations in the Extended Chandra Deep Field South
• A catalogue of micro-Jy radio sources in northern legacy fields
• The first release of data from the Herschel ATLAS: the SPIRE images
• H-ATLAS: PACS imaging for the Science Demonstration Phase
• The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources
• Deep multi-frequency radio imaging in the Lockman Hole using the GMRT and VLA: II. The spectral index of submillimetre galaxies
• The Properties of Microjansky Radio Sources in the HDF-N, SSA13, and SSA22 Fields
• The Herschel-ATLAS Data Release 2, Paper I. Submillimeter and Far-infrared Images of the South and North Galactic Poles: The Largest Herschel Survey of the Extragalactic Sky
• The MicroJansky Radio Galaxy Population
• Evolution in the Continuum Morphological Properties of Lyman-Alpha-Emitting Galaxies from z=3.1 to z=2.1
• Herschel-ATLAS: VISTA VIKING near-IR counterparts in the Phase 1 GAMA 9h data
• H-ATLAS/GAMA: Magnification Bias Tomography. Astrophysical constraints above $\sim 1$ arcmin
• A complete distribution of redshifts for sub-millimetre galaxies in the SCUBA-2 Cosmology Legacy Survey UDS field
• Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel-ATLAS

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