J/MNRAS/518/3301ivo://CDS.VizieR/J/MNRAS/518/3301doi:10.26093/cds/vizier.75183301CDSFratta M.Scaringi S.Monguio M.Pala A.F.Drew J.E.Knigge C.,Ilkiewicz K.A.Gandhi P.2024-08-22T20:16:38Z2022-12-12T13:29:24ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fremission-line-starsvisible-astronomyh-alpha-photometryspectroscopyState-of-the-art techniques to identify Ha emission line sources in narrow- band photometric surveys consist of searching for Ha excess with reference to nearby objects in the sky (position-based selection). However, while this approach usually yields very few spurious detections, it may fail to select intrinsically faint and/or rare Ha-excess sources. In order to obtain a more complete representation of the heterogeneous emission line populations, we recently developed a technique to find outliers relative to nearby objects in the colour-magnitude diagram (CMD-based selection). By combining position -based and CMD-based selections, we built an updated catalogue of Ha-excess candidates in the northern Galactic Plane. Here we present spectroscopic follow-up observations and classification of 114 objects from this catalogue, that enable us to test our novel selection method. Out of the 70 spectroscopically confirmed Ha emitters in our sample, 15 were identified only by the CMD-based selection, and would have been thus missed by the classic position-based technique. In addition, we explore the distribution of our spectroscopically confirmed emitters in the Gaia CMD. This information can support the classification of emission line sources in large surveys, such as the upcoming WEAVE and 4MOST, especially if augmented with the introduction of other colours.2023MNRAS.518.3301Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/518/3301CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)IV/36 : Gaia-IPHAS/KIS Value-Added Catalogues (Scaringi+, 2018)J/MNRAS/505/1135 : Gaia/IPHAS catalogue of Ha-excess sources (Fratta+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/518/3301https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/518/3301http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/518/3301https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/518/3301https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/518/3301http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/518/3301GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/518/3301/sources (List of sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/518/3301/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/518/3301/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/518/3301/sources?GETtext/xml+votable180.050000true79.547324814923635.13355540633880.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/MNRAS/518/33016/1306 1309 1320 1338 1439 1470 1782 1788 1833 1840 1966 3003 3015 3020 3026 3036-3037 3042 3290 3303 3309 3629 3638 3658 3712 3715 3724-3725 3738 3744 12955 13026 13998 14006 14010 14056 14069 14190 14264 14318 14335 14341 14363 14372 14384 14426 14446 14457 14544 14599 14647 14680 14716 15364 15367-15368 15377 15387 15392 15409 15425 15429 15640 15686 15700 15704 22067 22124 22164 22209 22212-22214 22233 22245 22260 23625 23637 23639 23802 23808 23840 23846 23943 23961 23994 24330 24473 24502 24521 24552 30268-30269 30281 30306 30366 30401 30421 30431 30439 30594 30602 30622 30638 30667 32073https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/518/3301?format=asciiOpticaldefaultJ/MNRAS/518/3301/sourcesList of sources_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspShow the spectrummeta.ref.urlcharGaiaDR2Unique Gaia DR2 source identifiermeta.id;meta.mainGaiaEDR3Unique Gaia EDR3 source identifiermeta.idRA_ICRSGaia DR2 barycentric right ascension (ICRS) at Epoch 2015.5degpos.eq.ra;meta.mainDE_ICRSGaia DR2 barycentric declination (ICRS) at Epoch 2015.5degpos.eq.dec;meta.mainDistDR2Parallax-inversion defined distance (Gaia DR2)kpcpos.distancedoubleDistEDR3Parallax-inversion defined distance (Gaia EDR3)kpcpos.distancedoubleGMAGDR2G-band absolute magnitude (Gaia DR2)magphys.magAbsdoubleGMAGEDR3G-band absolute magnitude (Gaia EDR3)magphys.magAbsdoubleBP-RPDR2G_(BP)_ - G_(RP)_ colour (Gaia DR2)magphot.color;em.opt.B;em.opt.RdoubleBP-RPEDR3G_(BP)_ - G_(RP)_ colour (Gaia EDR3)magphot.color;em.opt.B;em.opt.Rdoublermagr-band magnitude (IPHAS DR2)magphot.mag;em.opt.Rdoubler-ir-i colour (IPHAS DR2)magphot.color;em.opt.R;em.opt.Idoubler-Har-Ha colour (IPHAS DR2)magphot.color;em.opt.V;em.line.HalphadoubleCMDsigniSignificance of Ha-excess, obtained from the CMD-based selection (Fratta et al., 2021, Cat. J/MNRAS/505/1135)stat.fit.goodnessdoublePOSsigniSignificance of Ha-excess, obtained from the position-based selection (Fratta et al., 2021, Cat. J/MNRAS/505/1135)stat.fit.goodnessdoubleClassSpectroscopic classificationsrc.classcharFWHMFull width at half maximum of the Ha line0.1nmspect.line.widthdoubleFileNameName of the spectrum file in subdirectory fitsmeta.id;meta.filechar