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dc.contributor.authorGroßschedl, Josefa E.
dc.contributor.authorAlves, João
dc.contributor.authorTeixeira, Paula S.
dc.contributor.authorBouy, Hervé
dc.contributor.authorForbrich, Jan
dc.contributor.authorLada, Charles J.
dc.contributor.authorMeingast, Stefan
dc.contributor.authorHacar, Álvaro
dc.contributor.authorAscenso, Joana
dc.contributor.authorAckerl, Christine
dc.contributor.authorHasenberger, Birgit
dc.contributor.authorKöhler, Rainer
dc.contributor.authorKubiak, Karolina
dc.contributor.authorLarreina, Irati
dc.contributor.authorLinhardt, Lorenz
dc.contributor.authorLombardi, Marco
dc.contributor.authorMöller, Torsten
dc.date.accessioned2019-01-18T00:10:02Z
dc.date.available2019-01-18T00:10:02Z
dc.date.issued2018-09-30
dc.identifier.citationGroßschedl , J E , Alves , J , Teixeira , P S , Bouy , H , Forbrich , J , Lada , C J , Meingast , S , Hacar , Á , Ascenso , J , Ackerl , C , Hasenberger , B , Köhler , R , Kubiak , K , Larreina , I , Linhardt , L , Lombardi , M & Möller , T 2018 , ' VISION - Vienna survey in Orion. III. Young stellar objects in Orion A ' , Astronomy & Astrophysics . https://doi.org/10.1051/0004-6361/201832577
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 15441323
dc.identifier.otherPURE UUID: fce30931-846d-45d9-b9bf-b08fe60fb881
dc.identifier.otherArXiv: http://arxiv.org/abs/1810.00878v1
dc.identifier.otherScopus: 85061694966
dc.identifier.otherORCID: /0000-0001-8694-4966/work/62751222
dc.identifier.urihttp://hdl.handle.net/2299/20992
dc.description38 pages, 25 figures, Accepted for publication by A&A. Reproduced with permission from Astronomy & Astrophysics. © 2018 ESO
dc.description.abstractWe extend and refine the existing young stellar object (YSO) catalogs for the Orion A molecular cloud, the closest massive star-forming region to Earth. This updated catalog is driven by the large spatial coverage (18.3 deg^2, ~950 pc^2), seeing limited resolution (~0.7''), and sensitivity (Ks<19 mag) of the ESO-VISTA near-infrared survey of the Orion A cloud (VISION). Combined with archival mid- to far-infrared data, the VISTA data allow for a refined and more robust source selection. We estimate that among previously known protostars and pre-main-sequence stars with disks, source contamination levels (false positives) are at least ∼7% and ∼2.5%, respectively, mostly due to background galaxies and nebulosities. We identify 274 new YSO candidates using VISTA/Spitzer based selections within previously analyzed regions, and VISTA/WISE based selections to add sources in the surroundings, beyond previously analyzed regions. The WISE selection method recovers about 59% of the known YSOs in Orion A's low-mass star-forming part L1641, which shows what can be achieved by the all-sky WISE survey in combination with deep near-infrared data in regions without the influence of massive stars. The new catalog contains 2978 YSOs, which were classified based on the de-reddened mid-infrared spectral index into 188 protostars, 184 flat-spectrum sources, and 2606 pre-main-sequence stars with circumstellar disks. We find a statistically significant difference in the spatial distribution of the three evolutionary classes with respect to regions of high dust column-density, confirming that flat-spectrum sources are at a younger evolutionary phase compared to Class IIs, and are not a sub-sample seen at particular viewing angles.en
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.subjectastro-ph.SR
dc.subjectastro-ph.GA
dc.titleVISION - Vienna survey in Orion. III. Young stellar objects in Orion Aen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201832577
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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