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The second data release of the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS DR2)

Research output: Contribution to journalArticle

  • Geert Barentsen
  • H. J. Farnhill
  • E. A. González-Solares
  • R. Greimel
  • M. J. Irwin
  • B. Miszalski
  • C. Ruhland
  • P. Groot
  • A. Mampaso
  • S. E. Sale
  • A. A. Henden
  • A. Aungwerojwit
  • M. J. Barlow
  • P. J. Carter
  • R. L. M. Corradi
  • J. J. Drake
  • J. Eislöffel
  • J. Fabregat
  • B. T. Gänsicke
  • N. P. Gentile Fusillo
  • S. Greiss
  • A. S. Hales
  • S. Hodgkin
  • L. Huckvale
  • J. Irwin
  • R. King
  • C. Knigge
  • T. Kupfer
  • E. Lagadec
  • D. J. Lennon
  • J. R. Lewis
  • M. Mohr-Smith
  • R. A. H. Morris
  • T. Naylor
  • Q. A. Parker
  • S. Phillipps
  • S. Pyrzas
  • R. Raddi
  • G. H. A. Roelofs
  • P. Rodríguez-Gil
  • L. Sabin
  • S. Scaringi
  • D. Steeghs
  • J. Suso
  • R. Tata
  • Y. C. Unruh
  • J. van Roestel
  • K. Viironen
  • J. S. Vink
  • N. A. Walton
  • N. J. Wright
  • A. A. Zijlstra
Original languageEnglish
Pages (from-to)3230-3257
Number of pages28
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date15 Sep 2014
DateAccepted/In press - 11 Aug 2014
DateE-pub ahead of print - 15 Sep 2014
DatePublished (current) - 11 Nov 2014


The INT/WFC Photometric Hα Survey of the Northern Galactic Plane (IPHAS) is a 1800 deg2 imaging survey covering Galactic latitudes |b| <5° and longitudes ℓ = 30°-215° in the r, i, and Hα filters using the Wide Field Camera (WFC) on the 2.5-m Isaac Newton Telescope (INT) in La Palma. We present the first quality-controlled and globally calibrated source catalogue derived from the survey, providing single-epoch photometry for 219 million unique sources across 92 per cent of the footprint. The observations were carried out between 2003 and 2012 at a median seeing of 1.1 arcsec (sampled at 0.33 arcsec pixel-1) and to a mean 5σ depth of 21.2 (r), 20.0 (i), and 20.3 (Hα) in the Vega magnitude system.We explain the data reduction and quality control procedures, describe and test the global re-calibration, and detail the construction of the new catalogue. We show that the new calibration is accurate to 0.03 mag(root mean square) and recommend a series of quality criteria to select accurate data from the catalogue. Finally, we demonstrate the ability of the catalogue's unique (r - Hα, r - i) diagram to (i) characterize stellar populations and extinction regimes towards different Galactic sightlines and (ii) select and quantify Hα emission-line objects. IPHAS is the first survey to offer comprehensive CCD photometry of point sources across the Galactic plane at visible wavelengths, providing the much-needed counterpart to recent infrared surveys.

    Research areas

  • catalogues, surveys, stars: emission-line, Be, Galaxy: stellar content

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