Illuminating a tadpole's metamorphosis III: quantifying past and present environmental impact
Author
dc.contributor.author
Reiter, Megan
Author
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Haworth, Thomas J.
Author
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Guzmán, Andrés E.
Author
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Klaassen, Pamela D.
Author
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McLeod, Anna F.
Author
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Garay Brignardello, Guido
Admission date
dc.date.accessioned
2021-03-08T22:02:07Z
Available date
dc.date.available
2021-03-08T22:02:07Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Monthly Notices of the Royal Astronomical Society (2020) 497:3
es_ES
Identifier
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10.1093/mnras/staa2156
Identifier
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https://repositorio.uchile.cl/handle/2250/178595
Abstract
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We combine Multi-Unit Spectroscopic Explorer and Atacama Large Millimeter/sub-millimeter Array observations with theoretical models to evaluate how a tadpole-shaped globule located in the Carina Nebula has been influenced by its environment. This globule is nowrelatively small (radius similar to 2500 au), hosts a protostellar jet+outflow (HH900), and, with a blueshifted velocity of similar to 10 km s(-1), is travelling faster than it should be if its kinematics were set by the turbulent velocity dispersion of the precursor cloud. Its outer layers are currently still subject to heating, but comparing the internal and external pressures implies that the globule is in a post-collapse phase. Intriguingly the outflow is bent, implying that the Young Stellar Object (YSO) responsible for launching it is comoving with the globule, which requires that the star formed after the globule was up to speed since otherwise it would have been left behind. We conclude that the most likely scenario is one in which the cloud was much larger before being subject to radiatively driven implosion, which accelerated the globule to the high observed speeds under the photoevaporative rocket effect and triggered the formation of the star responsible for the outflow. The globule may now be in a quasi-steady state following collapse. Finally, the HH 900 YSO is likely greater than or similar to 1 M-circle dot and may be the only star forming in the globule. It may be that this process of triggered star formation has prevented the globule from fragmenting to form multiple stars (e.g. due to heating) and has produced a single higher mass star.
es_ES
Patrocinador
dc.description.sponsorship
European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant
665593
Royal Society of London
National Aeronautics & Space Administration (NASA)
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
AFB-170002
ESO telescopes at the Paranal Observatory
0101.C-0391(A)