V/165 IGAPS. merged IPHAS and UVEX of northern Galactic plane (Monguio+, 2020)
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 2020A&A...638A..18M
=2020yCat.5165....0M 2020yCat.5165....0M
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 Hα,
g, and URGO. The IGAPS footprint fills the Galactic coordinate range,
|b|<5° and 30°<l<215°. A uniform calibration, referred to
as the Pan-STARRS system, is applied to g, r, and i, while the
Hα 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 Hα. 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, rI and rU. The r 10σ limiting magnitude
is approximately 21, with median seeing of 1.1arcsec. Between
approximately 13th and 19th 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 Hα excess signalling line
emission, and for variation exceeding |rI-rU|=0.2mag. We find and
flag 8292 candidate emission line stars and over 53000 variables (both
at >5σ confidence).
Description:
The INT Galactic Plane Survey (IGAPS) was formed from merging the
IPHAS (Drew et al., 2005MNRAS.362..753D 2005MNRAS.362..753D) and UVEX (Groot et al.,
2009MNRAS.399..323G 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 (10σ). 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 2013ApJS..205...20M). We estimate the reproducibility of the
photometry in these bands (and in Hα) to be in the region of
0.02mag at magnitudes brighter than 19th mag.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
igapsdr1.sam 1085 1000 IGAPS point source catalogue
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See also:
II/321 : IPHAS DR2 Source Catalogue (Barentsen+, 2014)
J/MNRAS/399/323 : Simulated UVEX colors with reddening (Groot+, 2009)
Byte-by-byte Description of file: igapsdr1.sam
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Name Source designation (JHHMMSS.ss+DDMMSS.s)
without IGAPS prefix (name)
21- 35 F15.11 deg RAdeg Right ascension, J2000
(Gaia DR2 reference frame) (RA)
37- 50 F14.11 deg DEdeg Declination, J2000
(Gaia DR2 reference frame) (DEC)
52- 66 F15.11 deg GLON Galactic Longitude (gal_long)
68- 81 F14.11 deg GLAT Galactic Latitude (gal_lat)
83- 97 A15 --- SourceID Unique source identification string
(run-ccd-detectionnumber) (sourceID)
99- 103 F5.3 arcsec ePos ? Astrometric fit error (rms) across the
CCD (posErr)
105- 108 F4.1 --- Class Class (mergedClass) (1)
110- 113 F4.2 --- pStar Probability that the source is stellar
115- 118 F4.2 --- pGalaxy Probability that the source is extended
120- 123 F4.2 --- pNoise Probability that the source is noise
125- 129 F5.2 mag imag ? IPHAS i mag (Vega) using the 2.3 arcsec
aperture (i)
131- 134 F4.2 mag e_imag ? Random uncertainty for i. When r is not
available and no colour term has been
(iErr)
136- 140 F5.2 mag imagAB ? IPHAS i mag (AB) using the 2.3 arcsec
aperture (iAB)
142- 145 F4.2 --- Elli ? Ellipticity in the i-band (iEll)
147- 148 I2 --- Classi [-3/1]? Class for the i band (iClass) (2)
150 I1 --- Deblendi [0/1]? True if the i source is blended
with a nearby neighbour (iDeblend)
152 I1 --- Saturatedi [0/1]? True if the i source is saturated
(iSaturated)
154 I1 --- Vignettedi [0/1]? True if the i source is in a part
of focal plane where there is vignetting
(iVignetted)
156 I1 --- Traili [0/1]? True if the i source is close to a
linear artifact (iTrail)
158 I1 --- Truncatedi [0/1]? True if the i source is close to
the CCD boundary (iTruncated)
160 I1 --- BadPixi [0/1]? True if there are bad pixel(s) in
the i source aperture (iBadPix)
162- 172 F11.5 d MJDi ? Modified Julian Date at the start of
the i-band exposure (iMJD)
174- 177 F4.2 arcsec Seeingi ? Average FWHM in the i-band exposure
(iSeeing)
179- 193 A15 --- DetIDi ? Unique i-band detection identifier
(run-ccd-detectionnumber) (iDetectionID)
195- 199 F5.2 arcsec offRAi ? Position offset of the i-band detection
in RA (iDeltaRA)
201- 205 F5.2 arcsec offDEi ? Position offset of the i-band detection
in DEC (iDeltaDEC)
207- 211 F5.2 mag Hamag ? IPHAS H-alpha mag (Vega) using the
2.3 arcsec aperture (ha)
213- 216 F4.2 mag e_Hamag ? Random uncertainty for ha (haErr)
218- 222 F5.2 mag HamagAB ? IPHAS ha mag (AB) using the 2.3 arcsec
aperture (haAB)
224- 227 F4.2 --- EllHa ? Ellipticity in ha band (haEll)
229- 230 I2 --- ClassHa [-3/1]? Class for the ha band
(haClass) (2)
232 I1 --- DeblendHa [0/1]? True if the ha source is blended
with a nearby neighbour (haDeblend)
234 I1 --- SaturatedHa [0/1]? True if the ha source is saturated
(haSaturated)
236 I1 --- VignettedHa [0/1]? True if the ha source is in a part
of focal plane where there is vignetting
(haVignetted)
238 I1 --- TrailHa [0/1]? True if the ha source is close to
a linear artifact (haTrail)
240 I1 --- TruncatedHa [0/1]? True if the ha source is close to
the CCD boundary (haTruncated)
242 I1 --- BadPixHa [0/1]? True if there are bad pixel(s) in
the ha source aperture (haBadPix)
244- 254 F11.5 d MJDHa ? Modified Julian Date at the start of the
ha exposure (haMJD)
256- 259 F4.2 arcsec SeeingHa ? Average FWHM in the ha exposure
(haSeeing)
261- 275 A15 --- DetIDHa ? Unique ha detection identifier
(run-ccd-detectionnumber) (haDetectionID)
277- 281 F5.2 arcsec offRAHa ? Position offset of the ha-band detection
in RA (haDeltaRA)
283- 287 F5.2 arcsec offDEHa ? Position offset of the ha-band detection
in DEC (haDeltaDEC)
289- 293 F5.2 mag rImag ? IPHAS r mag (Vega) using the 2.3 arcsec
aperture (r_I)
295- 298 F4.2 mag e_rImag ? Random uncertainty for r_I. (rErr_I)
300- 304 F5.2 mag rImagAB ? IPHAS r mag (AB) using the 2.3 arcsec
aperture (rAB_I)
306- 309 F4.2 --- EllrI ? Ellipticity in r_I (rEll_I)
311- 312 I2 --- ClassrI [-3/1]? Class for the r_I band
(rClass_I) (2)
314 I1 --- DeblendrI [0/1]? True if the r_I source is blended
with a nearby neighbour (rDeblend_I)
316 I1 --- SaturatedrI [0/1]? True if the r_I source is
saturated (rSaturated_I)
318 I1 --- VignettedrI [0/1]? True if the r_I source is in a
part of focal plane where there is
vignetting (rVignetted_I)
320 I1 --- TrailrI [0/1]? True if the r_I source is close to
a linear artifact (rTrail_I)
322 I1 --- TruncatedrI [0/1]? True if the r_I source is close to
the CCD boundary (rTruncated_I)
324 I1 --- BadPixrI [0/1]? True if there are bad pixel(s) in
the r_I source aperture (rBadPix_I)
326- 336 F11.5 d MJDrI ? Modified Julian Date at the start of
the r_I exposure (rMJD_I)
338- 341 F4.2 arcsec SeeingrI ? Average FWHM in the r_I exposure
(rSeeing_I)
343- 357 A15 --- DetIDrI ? Unique r_I detection identifier
(run-ccd-detectionnumber)
(rDetectionID_I)
359- 363 F5.2 mag rUmag ? UVEX r mag (Vega) using the 2.3 arcsec
aperture (r_U)
365- 368 F4.2 mag e_rUmag ? Random uncertainty for r_U. (rErr_U)
370- 374 F5.2 mag rUmagAB ? UVEX r mag (AB) using the 2.3 arcsec
aperture (rAB_U)
376- 379 F4.2 --- EllrU ? Ellipticity in r_U (rEll_U)
381- 382 I2 --- ClassrU [-3/1]? Class for the r_U band
(rClass_U) (2)
384 I1 --- DeblendrU [0/1]? True if the r_U source is blended
with a nearby neighbour (rDeblend_U)
386 I1 --- SaturatedrU [0/1]? True if the r_U source is saturated
(rSaturated_U)
388 I1 --- VignettedrU [0/1]? True if the r_U source is in a part
of focal plane where there is vignetting
(rVignetted_U)
390 I1 --- TrailrU [0/1]? True if the r_U source is close to
a linear artifact (rTrail_U)
392 I1 --- TruncatedrU [0/1]? True if the r_U is close to the
CCD boundary (rTruncated_U)
394 I1 --- BadPixrU [0/1]? True if there are bad pixel(s) in
the r_U source aperture (rBadPix_U)
396- 406 F11.5 d MJDrU ? Modified Julian Date at the start of
the r_U exposure (rMJD_U)
408- 411 F4.2 arcsec SeeingrU ? Average FWHM in the r_U exposure
(rSeeing_U)
413- 427 A15 --- DetIDrU ? Unique r_U detection identifier
(run-ccd-detectionnumber)
(rDetectionID_U)
429- 433 F5.2 arcsec offRArU ? Position offset of the r_U detection in
RA (rDeltaRA_U)
435- 439 F5.2 arcsec offDErU ? Position offset of the r_U detection in
DEC (rDeltaDEC_U)
441- 445 F5.2 mag gmag ? UVEX g mag (Vega) using the 2.3 arcsec
aperture (g)
447- 450 F4.2 mag e_gmag ? Random uncertainty for g. When r is not
available and no colour term has been
(gErr)
452- 456 F5.2 mag gmagAB ? UVEX g mag (AB) using the 2.3 arcsec
aperture (gAB)
458- 461 F4.2 --- Ellg ? Ellipticity in the g-band (gEll)
463- 464 I2 --- Classg [-3/1]? Class for the g band (gClass) (2)
466 I1 --- Deblendg [0/1]? True if the g source is blended
with a nearby neighbour (gDeblend)
468 I1 --- Saturatedg [0/1]? True if the g source is saturated
(gSaturated)
470 I1 --- Vignettedg [0/1]? True if the g source is in a part
of focal plane where there is vignetting
(gVignetted)
472 I1 --- Trailg [0/1]? True if the g source is close to a
linear artifact (gTrail)
474 I1 --- Truncatedg [0/1]? True if the g source is close to
the CCD boundary (gTruncated)
476 I1 --- BadPixg [0/1]? True if there are bad pixel(s) in
the g source aperture (gBadPix)
478 I1 --- maskg [0/2]? Source located in the inner (1) or
outer (2) degraded area in the g-band
filter (gmask)
480- 490 F11.5 d MJDg ? Modified Julian Date at the start of the
g-band exposure (gMJD)
492- 495 F4.2 arcsec Seeingg ? Average FWHM in the g-band exposure
(gSeeing)
497- 511 A15 --- DetIDg ? Unique g-band detection identifier
(run-ccd-detectionnumber) (gDetectionID)
513- 517 F5.2 arcsec offRAg ? Position offset of the g-band detection
in RA (gDeltaRA)
519- 523 F5.2 arcsec offDEg ? Position offset of the g-band detection
in DEC (gDeltaDEC)
525- 529 F5.2 mag Umag ? UVEX U_RGO mag (Vega) using the
2.3 arcsec aperture. Default pipeline
calibration (U_RGO)
531- 534 F4.2 mag e_Umag ? Random uncertainty for U_RGO.
Pipeline random error only (UErr)
536- 539 F4.2 mag EllU ? Ellipticity in U_RGO band (UEll)
541- 542 I2 --- ClassU [-3/1]? Class for the U_RGO band
(UClass) (2)
544 I1 --- DeblendU [0/1]? True if the U_RGO source is blended
with a nearby neighbour (UDeblend)
546 I1 --- SaturatedU [0/1]? True if the U_RGO source is
saturated (USaturated)
548 I1 --- VignettedU [0/1]? True if the U_RGO source is in a
part of focal plane where there is
vignetting (UVignetted)
550 I1 --- TrailU [0/1]? True if the U_RGO is close to a
linear artifact (UTrail)
552 I1 --- TruncatedU [0/1]? True if the U_RGO is close to the
CCD boundary (UTruncated)
554 I1 --- BadPixU [0/1]? True if there are bad pixel(s) in
the U_RGO source aperture (UBadPix)
556- 566 F11.5 d MJDU ? Modified Julian Date at the start of
the U_RGO exposure (UMJD)
568- 571 F4.2 arcsec SeeingU ? Average FWHM in the U_RGO exposure
(USeeing)
573- 587 A15 --- DetIDU ? Unique U_RGO detection identifier
(run-ccd-detectionnumber) (UDetectionID)
589- 593 F5.2 arcsec offRAU ? Position offset of the U_RGO-band
detection in RA (UDeltaRA)
595- 599 F5.2 arcsec offDEU ? Position offset of the U_RGO-band
detection in DEC (UDeltaDEC)
601 I1 --- brightN [0/1] True if a very bright star is nearby
(brightNeighb)
603 I1 --- deblend [0/1] True if the source is blended with a
nearby neighbour in one or more bands.
605 I1 --- saturated [0/1] True if saturated in one or more
bands
607 I1 --- nBands [1/6] Number of bands in which the source
is detected.
609- 613 I5 --- errBits Bitmask indicating: bright neighbour (1)
source blending (2) trail (4)
saturation (8) (errBits)
615- 616 I2 --- nObsI Number of repeat IPHAS observations of
this source (nObs_I)
618- 619 I2 --- nObsU Number of repeat UVEX observations of
this source (nObs_U)
621- 634 A14 --- FieldIDI ? Survey field identifier in IPHAS e.g.
0001 0001o 0002 etc (fieldID_I)
636- 649 A14 --- FieldIDU ? Survey field identifier in UVEX e.g.
0001 0001o 0002 etc (fieldID_U)
651- 653 A3 --- FieldGradeI [+ABCD ] Internal quality control score of
the IPHAS field. A to D scale
(fieldGrade_I)
655- 657 A3 --- FieldGradeU [+ABCD ] Internal quality control score of
the UVEX field. A to D scale
(fieldGrade_U)
659 I1 --- emitter [0/2]? 2 if good candidate for Halpha
line emission 1 if marginal 0 if tested
and in main locus
661 I1 --- variable [0/1]? True if difference between the
IPHAS and UVEX r measurements exceeds
0.2 mag (variable)
663- 677 A15 --- SourceID2 ? Unique source identification string
for secondary detection (sourceID2)
679- 683 F5.2 mag imag2 ? IPHAS i mag (Vega) for the secondary
detection (i2)
685- 688 F4.2 mag e_imag2 ? Random uncertainty for i2. When r2 is
not available and no colour term has
been used (i2Err)
690- 693 F4.1 --- Classi2 ? Class for the i2 band (i2Class)
695- 698 F4.2 arcsec Seeingi2 ? Average FWHM in the i2 exposure
(i2Seeing)
700- 710 F11.5 d MJDi2 ? Modified Julian Date at the start of
the i2 exposure (i2MJD)
712- 716 F5.2 arcsec offRAi2 ? Position offset of the i2-band
detection in RA (i2DeltaRA)
718- 722 F5.2 arcsec offDEi2C ? Position offset of the i2-band
detection in DEC (i2DeltaDEC)
724- 738 A15 --- DetIDi2 ? Unique i2 detection identifier
(run-ccd-detectionnumber) (i2DetectionID)
740- 744 I5 --- ErrBitsi2 ? Bitmask indicating bright neighbour (1)
source blending (2) trail (4)
saturation (8) (i2ErrBits)
746- 750 F5.2 mag Hamag2 ? IPHAS H-alpha mag (Vega) for secondary
detection (ha2)
752- 755 F4.2 mag e_Hamag2 ? Random uncertainty for ha2 (ha2Err)
757- 760 F4.1 --- ClassHa2 ? Class for the ha2 band (ha2Class) (2)
762- 765 F4.2 arcsec SeeingHa2 ? Average FWHM in the ha2 exposure
(ha2Seeing)
767- 777 F11.5 d MJDHa2 ? Modified Julian Date at the start of
the ha2 exposure (ha2MJD)
779- 783 F5.2 arcsec offRAHa2 ? Position offset of the ha2-band
detection in RA (ha2DeltaRA)
785- 789 F5.2 arcsec offDEHa2 ? Position offset of the ha2-band
detection in DEC (ha2DeltaDEC)
791- 805 A15 --- DetIDHa2 ? Unique ha2 detection identifier
(run-ccd-detectionnumber)(ha2DetectionID)
807- 811 I5 --- ErrBitsHa2 ? Bitmask indicating bright neighbour (1)
source blending (2) trail (4)
saturation (8) (ha2ErrBits)
813- 817 F5.2 mag rImag2 ? IPHAS r mag (Vega) for the secondary
detection (r2_I)
819- 822 F4.2 mag e_rImag2 ? Random uncertainty for r2_I (r2Err_I)
824- 827 F4.1 --- ClassrI2 ? Class for the r2_I band (r2Class_I) (2)
829- 832 F4.2 arcsec SeeingrI2 ? Average FWHM in the r2_I exposure
(r2Seeing_I)
834- 844 F11.5 d MJDrI2 ? Modified Julian Date at the start of
the r2_I exposure (r2MJD_I)
846- 850 F5.2 arcsec offRArI2 ? Position offset of the r2_I-band
detection in RA (r2DeltaRA_I)
852- 856 F5.2 arcsec offDErI2 ? Position offset of the r2_I-band
detection in DEC (r2DeltaDEC_I)
858- 872 A15 --- DetIDrI2 ? Unique r2_I detection identifier
(run-ccd-detectionnumber)
(r2DetectionID_I)
874- 878 I5 --- ErrBitsrI2 ? Bitmask indicating bright neighbour (1)
source blending (2) trail (4)
saturation (8) (r2ErrBits_I)
880- 884 F5.2 mag rUmag2 ? UVEX r mag (Vega) for the secondary
detection (r2_U)
886- 889 F4.2 mag e_rUmag2 ? Random uncertainty for r2_U (r2Err_U)
891- 894 F4.1 --- ClassrU2 ? Class for the r2_U band (r2Class_U) (2)
896- 899 F4.2 arcsec SeeingrU2 ? Average FWHM in the r2_U exposure
(r2Seeing_U)
901- 911 F11.5 d MJDrU2 ? Modified Julian Date at the start of
the r2_U exposure (r2MJD_U)
913- 917 F5.2 arcsec offRArU2 ? Position offset of the r2_U-band
detection in RA (r2DeltaRA_U)
919- 923 F5.2 arcsec offDErU2 ? Position offset of the r2_U-band
detection in DEC (r2DeltaDEC_U)
925- 939 A15 --- DetIDrU2 ? Unique r2_U detection identifier
(run-ccd-detectionnumber)
(r2DetectionID_U)
941- 945 I5 --- ErrBitsrU2 ? Bitmask indicating bright neighbour (1)
source blending (2) trail (4)
saturation (8) (r2ErrBits_U)
947- 951 F5.2 mag gmag2 ? UVEX g mag (Vega) for the secondary
detection (g2)
953- 956 F4.2 mag e_gmag2 ? Random uncertainty for g2. When r2 is
not available and no colour term has
been used (g2Err)
958- 961 F4.1 --- Classg2 ? Class for the g2 band (g2Class) (2)
963- 966 F4.2 arcsec Seeingg2 ? Average FWHM in the is exposure
(g2Seeing)
968- 978 F11.5 d MJDg2 ? Modified Julian Date at the start of
the g2 exposure (g2MJD)
980- 984 F5.2 arcsec offRAg2 ? Position offset of the g2-band
detection in RA (g2DeltaRA)
986- 990 F5.2 arcsec offDEg2 ? Position offset of the g2-band
detection in DEC (g2DeltaDEC)
992-1006 A15 --- DetIDg2 ? Unique g2 detection identifier
(run-ccd-detectionnumber) (g2DetectionID)
1008-1012 I5 --- ErrBitsg2 ? Bitmask indicating bright neighbour (1)
source blending (2) trail (4)
saturation (8) (g2ErrBits)
1014-1018 F5.2 mag Umag2 ? UVEX U_RGO mag (Vega) for the secondary
detection. Default pipeline calibration
(U_RGO2)
1020-1023 F4.2 mag e_Umag2 ? Random uncertainty for U_RGO2 (U2Err)
1025-1028 F4.1 --- ClassU2 ? Class for the U_RGO2 band (U2Class) (2)
1030-1033 F4.2 arcsec SeeingU2 ? Average FWHM in the U_RGO2 exposure
(U2Seeing)
1035-1045 F11.5 d MJDU2 ? Modified Julian Date at the start of
the U_RGO2 exposure (U2MJD)
1047-1051 F5.2 arcsec offRAU2 ? Position offset of the U_RGO2-band
detection in RA (U2DeltaRA)
1053-1057 F5.2 arcsec offDEU2 ? Position offset of the U_RGO2-band
detection in DEC (U2DeltaDEC)
1059-1073 A15 --- DetIDU2 ? Unique U_RGO2 detection identifier
(run-ccd-detectionnumber) (U2DetectionID)
1075-1079 I5 --- ErrBitsU2 ? Bitmask indicating bright neighbour (1)
source blending (2) trail (4)
saturation (8) (U2ErrBits)
1081-1085 I5 --- ErrBits2 ? Global bitmask for the second detection
indicating: bright neighbour (1)
source blending (2) (errBits2)
--------------------------------------------------------------------------------
Note (1): Class as follows:
1 = galaxy
0 = noise
-1 = star
99 = if different filters don't agree
Note (2): Class as follows:
1 = galaxy
0 = noise
-1 = star
-2 = probableStar
-3 = probableGalaxy
--------------------------------------------------------------------------------
Acknowledgements:
Janet Drew, j.drew(at)ucl.ac.uk
(End) Patricia Vannier [CDS] 10-Mar-2020