J/MNRAS/518/3137 XGAPS. Galactic Plane Surveys cross-match (Scaringi+, 2023)
XGAPS: a sub-arcsec cross-match of galactic plane surveys.
Scaringi S., Monguio M., Knigge C., Fratta M., Gansicke B., Groot P.J.,
Rebassa-mansergas A., Toloza O.
<Mon. Not. R. Astron. Soc., 518, 3137-3146 (2023)>
=2023MNRAS.518.3137S 2023MNRAS.518.3137S (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galactic plane ; Parallaxes, trigonometric ;
Proper motions ; Photometry, SDSS ; Optical ;
Photometry, infrared ; Magnitudes, absolute
Keywords: catalogues - surveys - parallaxes - proper motions -
stars: emission-line - Galaxy: stellar content
Abstract:
We present a sub-arcsec cross-match of Gaia Data Release 3 (DR3)
against the INT Galactic Plane Surveys (IGAPS) and the United Kingdom
Infrared Deep Sky Survey (UKIDSS). The resulting cross-match of
Galactic Plane Surveys (XGAPS) provides additional precise photometry
(URGO, g, r, i, Hα, J, H, and K) to the Gaia photometry. In
building the catalogue, proper motions given in Gaia DR3 are wound
back to match the epochs of the IGAPS constituent surveys (INT
Photometric HαSurvey of the Northern Galactic Plane, IPHAS, and
the UV-Excess Survey of the Northern Galactic Plane, UVEX) and UKIDSS,
ensuring high-proper motion objects are appropriately cross-matched.
The catalogue contains 33987180 sources. The requirement of
>3σ parallax detection for every included source means that
distances out to 1-1.5kpc are well covered. In producing XGAPS, we
have also trained a Random Forest classifier to discern targets with
problematic astrometric solutions. Selection cuts based on the
classifier results can be used to clean colour-magnitude and
colour-colour diagrams in a controlled and justified manner, as well
as producing subsets of astrometrically reliable targets. We provide
XGAPS as a 111 column table. Uses of the catalogue include the
selection of Galactic targets for multi-object spectroscopic surveys
as well as identification of specific Galactic populations.
Description:
The aim of XGAPS is to cross-match all sources detected in IGAPS
(either IPHAS or UVEX) to Gaia DR3, and as a second step cross-match
those sources to UKIDSS. The cross-match is restricted to sources with
a significant Gaia DR3 parallax detection and IGAPS sources identified
as being stellar-like.
The XGAPS catalogue provides a sub-arcsec cross-match between Gaia
DR3, IPHAS, UVEX, and UKIDSS. It contains photometric and astrometric
measurements for ∼34 million sources within the northern Galactic
plane. In total, XGAPS contains two epoch photometry in the r-band, as
well as single-epoch (not simultaneous) photometry in up to nine
broad-band filters (URGO, g, r, i, J, H, K, G, GBP, and GRP) and one
narrow-band Hα-filter. XGAPS additionally provides a confidence
metric inferred using Random Forests aimed at assessing the
reliability of the Gaia-astrometric parameters for any given source in
the catalogue.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
xgaps.dat 1204 33987180 XGAPS catalogue
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
II/321 : IPHAS DR2 Source Catalogue (Barentsen+, 2014)
II/316 : UKIDSS-DR6 Galactic Plane Survey (Lucas+ 2012)
V/165 : IGAPS, merged IPHAS and UVEX of northern Galactic plane
(Monguio+, 2020)
Byte-by-byte Description of file: xgaps.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR3 Unique Gaia DR3 source designation
(GaiaDR3)
21- 35 F15.11 deg RAdeg Gaia DR3 barycentric right ascension (ICRS)
at Epoch 2016.0 (RAJ2016_Gaia)
37- 51 F15.11 deg DEdeg Gaia DR3 barycentric declination (ICRS)
at Epoch 2016.0 (DEJ2016_Gaia)
53- 60 F8.6 mas e_RAdeg Standard error of right ascension
(e_RA*cosDE) (errRAJ2016Gaia)
62- 69 F8.6 mas e_DEdeg Standard error of declination
(errDEJ2016Gaia)
71- 80 F10.5 mas Plx Absolute stellar parallax (parallax)
82- 89 F8.6 mas e_Plx Standard error of parallax (parallax_error)
91- 100 F10.4 --- RPlx Parallax divided by its standard error
(parallaxovererror)
102- 112 F11.5 mas/yr PM Total proper motion (pmRAxcosDE) (pm)
114- 124 F11.5 mas/yr pmRA Proper motion in right ascension direction
(pmraxcosDE) (pmra)
126- 136 F11.5 mas/yr pmDE Proper motion in declination direction
(pmdec)
138- 145 F8.6 mas/yr e_pmRA Standard error of proper motion in
right ascension direction (pmra_error)
147- 154 F8.6 mas/yr e_pmDE Standard error of proper motion
in declination direction (pmdec_error)
156- 164 F9.6 --- epsi Excess noise of the source from the Gaia
astrometric solution
(astrometricexcessnoise)
166- 177 E12.6 --- sepsi Significance of excess noise of the source
from the Gaia astrometric solution
(astrometricexcessnoise_sig)
179- 187 F9.6 --- RUWE Renormalised unit weight error (ruwe)
189 I1 --- DUP Source with multiple source identifiers
in GaiaDR3 (duplicated_source)
191- 202 E12.6 e-/s FG Gaia DR3 G-band mean flux
(photgmean_flux)
204- 215 E12.6 e-/s e_FG Error on the G-band mean flux
(photgmeanfluxerror)
217- 228 E12.6 e-/s RFG Integrated mean G flux divided by its error
(photgmeanfluxover_error)
230- 241 E12.6 e-/s FBP ?=- Gaia DR3 integrated BP mean flux
(photbpmean_flux)
243- 254 E12.6 e-/s e_FBP ?=- Error on the integrated BP mean flux
(photbpmeanfluxerror)
256- 267 E12.6 e-/s RFBP ?=- Integrated mean BP flux divided by its
error (photbpmeanfluxover_error)
269- 280 E12.6 e-/s FRP ?=- Gaia DR3 integrated RP mean flux
(photrpmean_flux)
282- 293 E12.6 e-/s e_FRP ?=- Error on the integrated RP mean flux
(photrpmeanfluxerror)
295- 306 E12.6 e-/s RFRP ?=- Integrated mean RP flux divided by its
error (photrpmeanfluxover_error)
308- 326 A19 --- IPHAS Source designation (JHHMMSS.ss+DDMMSS.s)
without IGAPS prefix for IPHAS detection
(nameIPHAS)
328- 342 F15.11 deg RAIdeg ?=- Right ascension (J2000) (Gaia DR2
reference frame) for IPHAS detection
(RAJbMJD_IPHAS)
344- 358 F15.11 deg DEIdeg ?=- Declination 9J2000) (Gaia DR2
reference frame) for IPHAS detection
(DECJbMJD_IPHAS)
360- 374 A15 --- ID-IPHAS IPHAS ?=- Unique source identification
string (run-ccd-detection number)
(sourceID_IPHAS)
376- 383 F8.6 arcsec eposIPHAS ?=- Astrometric fit error (RMS) across the
CCD for IPHAS detection(posErr_IPHAS)
385- 394 F10.4 d MJDrI ?=- Modified Julian Date at the start of
the r_I exposure (rMJD_I)
396- 405 F10.4 d MJDIPHAS ?=- Modified Julian Date used for
cross-matching Gaia to IPHAS (bMJD_IPHAS)
407- 418 E12.6 arcsec sepIPHAS ?=- Angular separation between the rewound
Gaia position at Epoch bMJD_IPHAS to the
nominal IPHAS position
(bMJDseparationIPHAS)
420- 438 A19 --- UVEX Source designation (JHHMMSS.ss + DDMMSS.s)
without IGAPS prefix for UVEX detection
(nameUVEX)
440- 454 F15.11 deg RAUdeg ?=- Right ascension (J2000) (Gaia DR2
reference frame) for UVEX detection
(RAJbMJD_UVEX)
456- 470 F15.11 deg DEUdeg ?=- Declination 9J2000) (Gaia DR2
reference frame) for UVEX detection
(DECJbMJD_UVEX)
472- 486 A15 --- ID-UVEX Unique source identification string
(run-ccd-detection number) for UVEX
detection (sourceID_UVEX)
488- 495 F8.6 arcsec eposUVEX ?=- Astrometric fit error (RMS) across the
CCD for UVEX detection (posErr_UVEX)
497- 506 F10.4 d MJDrU ?=- Modified Julian Date at the start of
the r_U exposure (rMJD_U)
508- 517 F10.4 d MJDUVEX ?=- Modified Julian Date used for
cross-matching Gaia to UVEX (bMJD_UVEX)
519- 530 E12.6 arcsec sepUVEX ?=- Angular separation between the rewound
Gaia position at Epoch bMJD_UVEX to the
nominal UVEX position
(bMJDseparationUVEX)
532- 543 I12 --- ID-UKIDSS ?=- Unique UKIDSS identifier
(sourceID_UKIDSS)
545- 559 F15.11 deg RAKdeg ?=- UKIDSS detection RA (RAJbMJD_UKIDSS)
561- 575 F15.11 deg DEKdeg ?=- UKIDSS detection DEC (DECJbMJD_UKIDSS)
577- 586 F10.4 yr epUKIDSS ?=- Epoch at the start of the UKIDSS
observation (epoch_UKIDSS)
588- 597 F10.4 d MJDUKIDSS ?=- Modified Julian Date used for
cross-matching Gaia to UKIDSS
(bMJD_UKIDSS)
599- 610 E12.6 arcsec sepUKIDSS ?=- Angular separation between the rewound
Gaia position at Epoch bMJD_UKIDSS to the
nominal UKIDSS position
(bMJDseparationUKIDSS)
612- 619 F8.5 mag Gmag Integrated G-band mean magnitude
(photgmean_mag)
621- 628 F8.5 mag BPmag ?=- Integrated BP mean magnitude
(photbpmean_mag)
630- 637 F8.5 mag RPmag ?=- Integrated RP mean magnitude
(photrpmean_mag)
639- 646 F8.5 mag iImag ?=- IPHAS i magnitude (Vega) using the
2.3 arcsec aperture (i)
648- 655 F8.6 mag e_iImag ?=- IPHAS i magnitude (Vega) error using
the 2.3 arcsec aperture (iErr)
657- 664 F8.5 mag Hamag ?=- IPHAS Hα magnitude (Vega) using
the 2.3 arcsec aperture (ha)
666- 673 F8.6 mag e_Hamag ?=- IPHAS Hα magnitude (Vega) error
using the 2.3 arcsec aperture (haErr)
675- 682 F8.5 mag rImag ?=- IPHAS r magnitude (Vega) using the
2.3 arcsec aperture (r_I)
684- 691 F8.6 mag e_rImag ?=- IPHAS r magnitude (Vega) error using
the 2.3 arcsec aperture (rErr_I)
693- 700 F8.5 mag i2Imag ?=- IPHAS i magnitude (Vega) for the
secondary detection (i2)
702- 709 F8.6 mag e_i2Imag ?=- IPHAS i magnitude (Vega) error for the
secondary detection (i2Err)
711- 718 F8.5 mag Ha2mag ?=- IPHAS Hα magnitude (Vega) for the
secondary detection (ha2)
720- 727 F8.6 mag e_Ha2mag ?=- IPHAS Hα magnitude (Vega) error
for the secondary detection (ha2Err)
729- 736 F8.5 mag r2Imag ?=- IPHAS r magnitude (Vega) for the
secondary detection (r2_I)
738- 745 F8.6 mag e_r2Imag ?=- IPHAS r magnitude (Vega) error for the
secondary detection (r2Err_I)
747- 756 F10.4 --- MJDr2I ?=- Modified Julian Date at the start of
the r2_I exposure (r2MJD_I)
758- 765 F8.5 mag rUmag ?=- UVEX r magnitude (Vega) using the
2.3 arcsec aperture (r_U)
767- 774 F8.6 mag e_rUmag ?=- UVEX r magnitude (Vega) error using
the 2.3 arcsec aperture (rErr_U)
776- 783 F8.5 mag gUmag ?=- UVEX g magnitude (Vega) using the
2.3 arcsec aperture (g)
785- 792 F8.6 mag e_gUmag ?=- UVEX g magnitude (Vega) error using the
2.3 arcsec aperture (gErr)
794- 801 F8.5 mag URGOmag ?=- UVEX URGO magnitude (Vega) using the
2.3 arcsec aperture (U_RGO)
803- 810 F8.6 mag e_URGOmag ?=- Random uncertainty for U_RGO.
Pipeline random error only (UErr)
812- 819 F8.5 mag r2Umag ?=- UVEX r magnitude (Vega) for the
secondary detection (r2_U)
821- 828 F8.6 mag e_r2Umag ?=- UVEX r magnitude (Vega) error for the
secondary detection (r2Err_U)
830- 837 F8.5 mag g2Umag ?=- UVEX g magnitude (Vega) for the
secondary detection (g2)
839- 846 F8.6 mag e_g2Umag ?=- UVEX g magnitude (Vega) error for the
secondary detection (g2Err)
848- 855 F8.5 mag URGO2mag ?=- UVEX URGO magnitude (Vega) for the
secondary detection (U_RGO2)
857- 864 F8.6 mag e_URGO2mag ?=- UVEX Random uncertainty for U_RGO2.
Pipeline random error only (U2Err)
866- 875 F10.4 --- MJDr2U ?=- Modified Julian Date at the start of
the r2_U exposure (r2MJD_U)
877- 884 F8.5 mag Jmag ?=- UKIDSS J magnitude (Vega) using
2.0 arcsec aperture (j)
886- 893 F8.6 mag e_Jmag ?=- UKIDSS J magnitude (Vega) error using
2.0 arcsec aperture (jErr)
895- 902 F8.5 mag Hmag ?=- UKIDSS H magnitude (Vega) using
2.0 arcsec aperture (h)
904- 911 F8.6 mag e_Hmag ?=- UKIDSS H magnitude (Vega) error using
2.0 arcsec aperture (hErr)
913- 921 F9.5 mag Kmag ?=- UKIDSS K magnitude (Vega) using
2.0 arcsec aperture (null=-99.99999)
(k)
923- 932 F10.6 mag e_Kmag []?=- UKIDSS K magnitude (Vega) error using
2.0 arcsec aperture (null=-99.99999)
(kErr)
934- 942 F9.6 mag BP-RP ?=- BP-RP colour (bp_rp)
944- 952 F9.6 mag BP-G ?=- BP-G colour (bp_g)
954- 962 F9.6 mag G-RP ?=- G-RP colour (g_rp)
964- 972 F9.6 mag rI-i ?=- rI-i colour (rmi)
974- 982 F9.6 mag rI_Ha ?=- rI-Hα colour (rmha)
984- 992 F9.6 mag URGO-g ?=- uRGO-g colour (Umg)
994-1002 F9.6 mag g-rU ?=- g-rU colour (gmr)
1004-1012 F9.6 mag J-H ?=- J-H colour (jmh)
1014-1023 F10.6 mag J-K ?=- J-K colour (null=999.999999) (jmk)
1025-1033 F9.6 mag G-J ?=- G-J colour (Gmj)
1035-1044 F10.6 mag URGO-K ?=- URGO-K colour (null=999.999999) (Umk)
1046 I1 --- pSolved Number of parameters solved for in the
Gaia DR3 model (paramsSolved)
1048-1059 E12.6 --- redChi2 Reduced chi2 for the Gaia DR3
astrometric fit (redChi2) (1)
1061-1072 E12.6 --- rmsG Root mean square for the G band Gaia
observations (rmsG) (2)
1074-1085 E12.6 --- fracrmsG Fractional root mean square for the G band
Gaia observations (frac_rmsG) (3)
1087-1098 F12.6 pc Dist Inverse parallax distance to the source
(no reddening) (dist) (4)
1100-1110 F11.6 mas/yr vT Transverse velocity computed as
4.74*dist*(pm/1000) (vT)
1112-1119 F8.5 mag GMAG Absolute Gaia G magnitude inferred using
the inverse parallax distance dist (M_G)
1121-1128 F8.5 mag rIMAG ?=- Absolute IPHAS r magnitude inferred
using the inverse parallax distance dist
(R_IPHAS)
1130-1137 F8.5 mag iIMAG ?=- Absolute IPHAS i magnitude inferred
using the inverse parallax distance dist
(I_IPHAS)
1139-1146 F8.5 mag rUMAG ?=- Absolute UVEX r magnitude inferred
using the inverse parallax distance dist
(R_UVEX)
1148-1155 F8.5 mag gUMAG ?=- Absolute UVEX g magnitude inferred
using the inverse parallax distance dist
(G_UVEX)
1157-1164 F8.5 mag URGOMAG ?=- Absolute UVEX U_RGO magnitude inferred
using the inverse parallax distance dist
(U_UVEX)
1166-1173 F8.5 mag JMAG ?=- Absolute UKIDSS J magnitude inferred
using the inverse parallax distance dist
(M_j)
1175-1182 F8.5 mag HMAG ?=- Absolute UKIDSS H magnitude inferred
using the inverse parallax distance dist
(M_h)
1184-1193 F10.5 mag KMAG ?=- Absolute UKIDSS K magnitude inferred
using the inverse parallax distance dist
(M_k) (null=-999.99999)
1195-1202 F8.6 --- voteRF Random Forest classification probability
for the source being classed as a good
astrometric source (voteRF)
1204 I1 --- flagRF [0/1] Random Forest classification.
1 if voteRF>0.5, else 0 (flagRF)
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Note (1): Reduced chi2 for the Gaia DR3 astrometric fit computed as
astrometricchi2al/(astrometricngoodobsal-paramsSolved)
Note (2): Root mean square for the G band Gaia observations computed as
photgmeanfluxerror*(sqrt(photgn_obs))
Note (3): Fractional root mean square for the G band Gaia observations computed
as photgmeanfluxerror*(sqrt(photgnobs)/photgmeanflux)
Note (4): Inverse parallax distance to the source (no reddening) computed
as 1/(abs(parallax)/1000)
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Acknowledgements:
Simone Scaringi, simone.scaringi(at)durham.ac.uk
(End) Patricia Vannier [CDS] 19-Apr-2023