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

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 FusilloS. 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

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Abstract

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.
Original languageEnglish
Pages (from-to)3230-3257
Number of pages28
JournalMonthly Notices of the Royal Astronomical Society
Volume444
Issue number4
Early online date15 Sep 2014
DOIs
Publication statusPublished - 11 Nov 2014

Keywords

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

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    Barentsen, G., Farnhill, H. J., González-Solares, E. A., Greimel, R., Irwin, M. J., Miszalski, B., Ruhland, C., Groot, P., Mampaso, A., Sale, S. E., Henden, A. A., Aungwerojwit, A., Barlow, M. J., Carter, P. J., Corradi, R. L. M., Drake, J. J., Eislöffel, J., Fabregat, J., Gänsicke, B. T., ... Zijlstra, A. A. (2014). The second data release of the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS DR2). Monthly Notices of the Royal Astronomical Society, 444(4), 3230-3257. https://doi.org/10.1093/mnras/stu1651