The Gaia/IPHAS and Gaia/KIS Value-Added Catalogues

Abstract

We present a sub-arcsecond cross-match of Gaia DR2 against the INT Photometric H-alpha Survey of the Northern Galactic Plane Data Release 2 (IPHAS DR2) and the Kepler-INT Survey (KIS). The resulting value-added catalogues (VACs) provide additional precise photometry to the Gaia photometry (r, i and H-alpha for IPHAS, with additional U and g for KIS). In building the catalogue, proper motions given in \gaia\ DR2 are wound back to match the epochs of IPHAS DR2, thus ensuring high proper motion objects are appropriately cross-matched. The catalogues contain 7,927,224 and 791,071 sources for IPHAS and KIS, respectively. The requirement of >5-sigma parallax detection for every included source means that distances out to 1--1.5 kpc are well covered. We define two additional parameters for each catalogued object: (i) $f_c$, a magnitude-dependent tracer of the quality of the Gaia astrometric fit; (ii) $f_{FP}$, the false-positive rate for parallax measurements determined from astrometric fits of a given quality at a given magnitude. Selection cuts based on these parameters can be used to clean colour-magnitude and colour-colour diagrams in a controlled and justified manner. We provide both full and light versions of the VAC, with VAC-light containing only objects that represent our recommended trade-off between purity and completeness. Uses of the catalogues include the identification of new variable stars in the matched data sets, and more complete identification of H-alpha-excess emission objects thanks to separation of high-luminosity stars from the main sequence.

arXiv commentAccepted for publication in MNRAS. Full catalogs are being submitted to VizieR, and are also available at http://www.phys.ttu.edu/~simo/GaiaVACs

References in corpus (22)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Gaia Data Release 2: The astrometric solution
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The VizieR database of Astronomical Catalogues
• Astrophysics Source Code Library
• Gaia Data Release 2: using Gaia parallaxes
• Gaia Data Release 2: Catalogue validation
• Gaia Data Release 1: Catalogue validation
• The Second Data Release of the INT Photometric H-Alpha Survey of the Northern Galactic Plane (IPHAS DR2)
• Gaia Data Release 2: processing of the photometric data
• The IPHAS Catalogue of Halpha Emission Line Sources in the Northern Galactic Plane
• Initial Data Release from the INT Photometric H-alpha Survey of the Northern Galactic Plane (IPHAS)
• Initial data release of the Kepler-INT Survey
• High Spatial Resolution Galactic 3D Extinction Mapping with IPHAS
• The UV-Excess Survey of the Northern Galactic Plane (UVEX)
• Newly Discovered Cataclysmic Variables from the INT/WFC Photometric H alpha Survey of the Northern Galactic Plane
• The Properties of Cataclysmic Variables In Photometric Halpha Surveys
• Physical parameters of IPHAS-selected classical Be stars. (I. Determination procedure and evaluation of the results.)
• Spectroscopic identifications of blue H-alpha excess sources in the Kepler field-of-view
• First results of an H-alpha based search of classical Be stars in the Perseus Arm and beyond
• Calibrated and completeness-corrected optical stellar density maps of the Northern Galactic Plane

Cited by in corpus (6)

• Gaia Data Release 3: The Galaxy in your preferred colours. Synthetic photometry from Gaia low-resolution spectra
• Catalogue of new Herbig Ae/Be and classical Be stars. A machine learning approach to Gaia DR2
• IGAPS: the merged IPHAS and UVEX optical surveys of theNorthern Galactic Plane
• Overview of the LAMOST-$Kepler$ project
• Population-based identification of Hα-excess sources in the Gaia DR2 and IPHAS catalogues
• XGAPS: a sub-arcsecond cross-match of Galactic Plane Surveys