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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2019

VISION - Vienna survey in Orion. III. Young stellar objects in Orion A

Josefa E. Grossschedl
  • Fonction : Auteur
Paula S. Teixeira
  • Fonction : Auteur
H. Bouy
Jan Forbrich
  • Fonction : Auteur
Charles J. Lada
  • Fonction : Auteur
Stefan Meingast
  • Fonction : Auteur
Álvaro Hacar
  • Fonction : Auteur
Joana Ascenso
  • Fonction : Auteur
Christine Ackerl
  • Fonction : Auteur
Birgit Hasenberger
  • Fonction : Auteur
Rainer Köhler
  • Fonction : Auteur
Karolina Kubiak
  • Fonction : Auteur
Irati Larreina
  • Fonction : Auteur
Lorenz Linhardt
  • Fonction : Auteur

Résumé

We have extended and refined 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$^2$, $\sim$950 pc$^2$), seeing limited resolution ($\sim$0.7$"$), and sensitivity ($K_s<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 $\sim$6.4% and $\sim$2.3%, 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 2980 YSOs, which were classified based on the de-reddened mid-infrared spectral index into 188 protostars, 185 flat-spectrum sources, and 2607 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.
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Dates et versions

hal-01982239 , version 1 (25-08-2023)

Identifiants

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Josefa E. Grossschedl, João Alves, Paula S. Teixeira, H. Bouy, Jan Forbrich, et al.. VISION - Vienna survey in Orion. III. Young stellar objects in Orion A. Astronomy and Astrophysics - A&A, 2019, 622, pp.id.A149. ⟨10.1051/0004-6361/201832577⟩. ⟨hal-01982239⟩
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