The VST Photometric Hα Survey of the Southern Galactic Plane and Bulge (VPHAS+)

Drew, J. E.; Gonzalez-Solares, E.; Greimel, R.; Irwin, M. J.; Küpcü Yoldas, A.; Lewis, J.; Barentsen, G.; Eislöffel, J.; Farnhill, H. J.; Martin, W. E.; Walsh, J. R.; Walton, N. A.; Mohr-Smith, M.; Raddi, R.; Sale, S. E.; Wright, N. J.; Groot, P.; Barlow, M. J.; Corradi, R. L. M.; Drake, J. J.; Fabregat, J.; Frew, D. J.; Gänsicke, B. T.; Knigge, C.; Mampaso, A.; Morris, R. A. H.; Naylor, T.; Parker, Q. A.; Phillipps, S.; Ruhland, C.; Steeghs, D.; Unruh, Y. C.; Vink, J. S.; Wesson, R.; Zijlstra, A. A.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 440, Issue 3, p.2036-3058

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4
2014
Number of authors
35
IAC number of authors
2
Citations
243
Refereed citations
215
Description
The VST Photometric Hα Survey of the Southern Galactic Plane and Bulge (VPHAS+) is surveying the southern Milky Way in u, g, r, i and Hα at ˜1 arcsec angular resolution. Its footprint spans the Galactic latitude range -5o < b < +5° at all longitudes south of the celestial equator. Extensions around the Galactic Centre to Galactic latitudes ±10° bring in much of the Galactic bulge. This European Southern Observatory public survey, begun on 2011 December 28, reaches down to ˜20th magnitude (10σ) and will provide single-epoch digital optical photometry for ˜300 million stars. The observing strategy and data pipelining are described, and an appraisal of the segmented narrow-band Hα filter in use is presented. Using model atmospheres and library spectra, we compute main-sequence (u - g), (g - r), (r - i) and (r - Hα) stellar colours in the Vega system. We report on a preliminary validation of the photometry using test data obtained from two pointings overlapping the Sloan Digital Sky Survey. An example of the (u - g, g - r) and (r - Hα, r - i) diagrams for a full VPHAS+ survey field is given. Attention is drawn to the opportunities for studies of compact nebulae and nebular morphologies that arise from the image quality being achieved. The value of the u band as the means to identify planetary-nebula central stars is demonstrated by the discovery of the central star of NGC 2899 in survey data. Thanks to its excellent imaging performance, the VLT Survey Telescope (VST)/OmegaCam combination used by this survey is a perfect vehicle for automated searches for reddened early-type stars, and will allow the discovery and analysis of compact binaries, white dwarfs and transient sources.
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