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V/165 IGAPS. merged IPHAS and UVEX of northern Galactic plane (Monguio+, 2020)
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IGAPS: the merged IPHAS and UVEX optical surveys of the northern Galactic plane
Monguio M., Greimel R., Drew J.E., Barentsen G., Groot P.J., Irwin M.J.,
Casares J., Gaensicke B.T., Carter P.J., Corral-Santana J.M.,
Gentile-Fusillo N.P., Greiss S., van Haaften L.M., Hollands M., Jones D.,
Kupfer T., Manser C.J., Murphy D.N.A., McLeod A.F., Oosting T., Parker Q.A.,
Pyrzas S., Rodriguez-Gil P., van Roestel J., Scaringi S., Schellart P.,
Toloza O., Vaduvescu O., van Spaandonk L., Verbeek K., Wright N.J.,
Eisloeel J., Fabregat J., Harris A., Morris R.A.H., Phillipps S., Raddi R.,
Sabin L., Unruh Y., S Vink J., Wesson R., Cardwell A., de Burgos A.,
Cochrane R.K., Doostmohammadi S., Mocnik T., Stoev H., Suarez-Andres L.,
Tudor V., Wilson T.G., Zegmott T.J.
<Astron. Astrophys., 638, A18 (2020)>
=2020A&A...638A..18M
=2020yCat.5165....0M
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ADC_Keywords: Surveys ; Galactic plane ; Photometry, H-alpha ; Stars, emission;
Photometry, ultraviolet
Keywords: stars: general - stars: evolution - Galaxy: disc - surveys -
catalogues
Abstract:
The INT Galactic Plane Survey (IGAPS) is the merger of the optical
photometric surveys, IPHAS and UVEX, based on data from the Isaac
Newton Telescope (INT) obtained between 2003 and 2018. Here, we
present the IGAPS point source catalogue. It contains 295.4 million
rows providing photometry in the filters, i, r, narrow-band Halpha,
g, and URGO. The IGAPS footprint fills the Galactic coordinate range,
|b|<5deg and 30deg<l<215deg. A uniform calibration, referred to
as the Pan-STARRS system, is applied to g, r, and i, while the
Halpha calibration is linked to r and then is reconciled via field
overlaps. The astrometry in all five bands has been recalculated in
the reference frame of Gaia Data Release 2. Down to i 20mag (Vega
system), most stars are also detected in g, r, and Halpha. As
exposures in the r band were obtained in both the IPHAS and UVEX
surveys, typically a few years apart, the catalogue includes two
distinct r measures, r_I_ and r_U_. The r 10sigma limiting magnitude
is approximately 21, with median seeing of 1.1arcsec. Between
approximately 13^th^ and 19^th^ mag in all bands, the photometry is
internally reproducible to within 0.02 magnitudes. Stars brighter than
r=19.5mag are tested for narrow-band Halpha excess signalling line
emission, and for variation exceeding |r_I_-r_U_|=0.2mag. We find and
flag 8292 candidate emission line stars and over 53000 variables (both
at >5sigma confidence).
Description:
The INT Galactic Plane Survey (IGAPS) was formed from merging the
IPHAS (Drew et al., 2005MNRAS.362..753D) and UVEX (Groot et al.,
2009MNRAS.399..323G, Cat. J/MNRAS/399/323) surveys of the northern
Galactic plane, based on data from the Isaac Newton Telescope (INT)
obtained between 2003 and 2018. It is a catalogue of 174 columns and
almost 300 million rows, spanning the r magnitude range from 12-13th
mag down to 21st mag (10sigma). The astrometry in all five
photometric bands has been placed in the Gaia DR2 reference frame.
Broadband g, r, and i have been uniformly calibrated using PanSTARRS
data resting on that project's 'Ubercal' (Magnier et al.
2013ApJS..205...20M). We estimate the reproducibility of the
photometry in these bands (and in Halpha) to be in the region of
0.02mag at magnitudes brighter than 19th mag.