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The Gaia/IPHAS and Gaia/KIS value-added catalogues

The Gaia/IPHAS and Gaia/KIS value-added catalogues
The Gaia/IPHAS and Gaia/KIS value-added catalogues
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.
astro-ph.SR, astro-ph.GA, astro-ph.IM
0035-8711
Scaringi, S.
88701970-a1b9-41fe-bf55-886716ee3374
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Drew, J. E.
40d903d7-edb5-479c-beef-462dced47ce7
Monguio, M.
e2e4310a-4ed4-41a4-97a6-a48cb5702eda
Breedt, E.
8a142b4e-67c2-4d4e-a7d5-9d179a63b2ec
Fratta, M.
5dcc23b2-0d86-44df-9cbc-059a578f235d
Gaensicke, B.
9e3833c5-638c-40ef-847b-db28f316b77c
Maccarone, T. J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Pala, A. F.
309d2ed8-d17b-4504-9ef9-f33a9cdef6fe
Schill, C.
23329488-8eec-48d2-abe7-3056830a5fd1
Scaringi, S.
88701970-a1b9-41fe-bf55-886716ee3374
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Drew, J. E.
40d903d7-edb5-479c-beef-462dced47ce7
Monguio, M.
e2e4310a-4ed4-41a4-97a6-a48cb5702eda
Breedt, E.
8a142b4e-67c2-4d4e-a7d5-9d179a63b2ec
Fratta, M.
5dcc23b2-0d86-44df-9cbc-059a578f235d
Gaensicke, B.
9e3833c5-638c-40ef-847b-db28f316b77c
Maccarone, T. J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Pala, A. F.
309d2ed8-d17b-4504-9ef9-f33a9cdef6fe
Schill, C.
23329488-8eec-48d2-abe7-3056830a5fd1

Scaringi, S., Knigge, C., Drew, J. E., Monguio, M., Breedt, E., Fratta, M., Gaensicke, B., Maccarone, T. J., Pala, A. F. and Schill, C. (2018) The Gaia/IPHAS and Gaia/KIS value-added catalogues. Monthly Notices of the Royal Astronomical Society. (doi:10.1093/mnras/sty2498).

Record type: Article

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.

Text
1809.04086v1 - Accepted Manuscript
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More information

Accepted/In Press date: 11 September 2018
e-pub ahead of print date: 13 September 2018
Additional Information: Accepted for publication in MNRAS. Full catalogs are being submitted to VizieR, and are also available at http://www.phys.ttu.edu/~simo/GaiaVACs
Keywords: astro-ph.SR, astro-ph.GA, astro-ph.IM

Identifiers

Local EPrints ID: 423530
URI: http://eprints.soton.ac.uk/id/eprint/423530
ISSN: 0035-8711
PURE UUID: b90b06ea-24b8-460a-ad00-ef4615630b2f

Catalogue record

Date deposited: 25 Sep 2018 16:30
Last modified: 19 Jul 2019 16:58

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