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3D shape of Orion A with Gaia DR2 An informed view on Star Formation Rates and Efficiencies

Published online by Cambridge University Press:  13 January 2020

Josefa E. Großschedl Open the ORCID record for Josefa E. Großschedl [Opens in a new window] ,
João Alves ,
Stefan Meingast  and
Birgit Hasenberger Open the ORCID record for Birgit Hasenberger [Opens in a new window]
Josefa E. Großschedl
Affiliation:
Universität Wien, Institut für Astrophysik, Türkenschanzstraße 17, A-1180 Wien email: [email protected]
João Alves
Affiliation:
Universität Wien, Institut für Astrophysik, Türkenschanzstraße 17, A-1180 Wien email: [email protected] University of Vienna, Faculty of Earth Sciences, Geography and Astronomy, Data Science @ Uni Vienna
Stefan Meingast
Affiliation:
Universität Wien, Institut für Astrophysik, Türkenschanzstraße 17, A-1180 Wien email: [email protected]
Birgit Hasenberger
Affiliation:
Universität Wien, Institut für Astrophysik, Türkenschanzstraße 17, A-1180 Wien email: [email protected]
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Abstract

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The giant molecular cloud Orion A is the closest massive star-forming region to earth (d ∼ 400 pc). It contains the rich Orion Nebula Cluster (ONC) in the North, and low-mass star-forming regions (L1641, L1647) to the South. To get a better understanding of the differences in star formation activity, we perform an analysis of the gas mass distribution and star formation rate across the cloud. We find that the gas is roughly uniformly distributed, while, oddly, the ONC region produced about a factor of ten more stars compared to the rest of the cloud. For a better interpretation of this phenomenon, we use Gaia DR2 parallaxes, to analyse distances of young stellar objects, using them as proxy for cloud distances. We find that the ONC region indeed lies at about 400 pc while the low-mass star-forming parts are inclined about 70∘ from the plane of the sky reaching until ∼470 pc. With this we estimate that Orion A is an about 90 pc long filamentary cloud (about twice as long as previously assumed), with its “Head” (the ONC region) being “bent” and oriented towards the galactic mid-plane. This striking new view allows us to perform a more robust analysis of this important star-forming region in the future.

Keywords

methods: statisticalastrometrystars: distancesstars: pre–main-sequenceISM: clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S345: Origins: From the Protosun to the First Steps of Life , August 2018 , pp. 27 - 33
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© International Astronomical Union 2020

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