A 3D extinction map of the northern Galactic plane based on IPHAS photometry

S. E. Sale, J.E. Drew, G. Barentsen, H. J. Farnhill, R. Raddi, M. J. Barlow, J. Eisl̈offel, J. S. Vink, P. Rodŕiguez-Gil, N. J. Wright

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We present a 3D map of extinction in the northern Galactic plane derived using photometry from the INT/WFC Photometric Hα Survey of the northern Galactic plane. The map has fine angular (~10 arcmin) and distance (100 pc) sampling allied to a significant depth (≳5 kpc). We construct the map using a method based on a hierarchical Bayesian model described in a previous article by Sale. In addition to mean extinction, we also measure differential extinction, which arises from the fractal nature of the interstellar medium, and show that it will be the dominant source of uncertainty in estimates of extinction to some arbitrary position. The method applied also furnishes us with photometric estimates of the distance, extinction, effective temperature, surface gravity, and mass for ~38 million stars. Both the extinction map and the catalogue of stellar parameters are made publicly available via http://www.iphas.org/extinction.

Original languageEnglish
Pages (from-to)2907-2922
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date6 Aug 2014
Publication statusPublished - 1 Oct 2014


  • Dust, extinction
  • ISM: structure
  • Stars: fundamental parameters
  • Surveys


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