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Yamaguchi interferometer survey of protostellar outflows embedded in 70-μm dark infrared dark cloud

Published online by Cambridge University Press:  07 February 2024

Keita Kitaguchi ,
Kazuhito Motogi Open the ORCID record for Kazuhito Motogi [Opens in a new window] ,
Kenta Fujisawa ,
Kotaro Niinuma  and
Ryotaro Fujiwara
Keita Kitaguchi
Affiliation:
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan.
Kazuhito Motogi*
Affiliation:
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan. The Research Institute of Time Studies, Yamaguchi University, Yamaguchi, Yamaguchi 753-8511, Japan
Kenta Fujisawa
Affiliation:
The Research Institute of Time Studies, Yamaguchi University, Yamaguchi, Yamaguchi 753-8511, Japan
Kotaro Niinuma
Affiliation:
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan. The Research Institute of Time Studies, Yamaguchi University, Yamaguchi, Yamaguchi 753-8511, Japan
Ryotaro Fujiwara
Affiliation:
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi, Yamaguchi 753-8512, Japan.
*
email: [email protected]
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Abstract

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Recent ALMA observations detected protostellar outflows in 70-μm dark infrared dark clouds (IRDCs). These sources are candidates for the initial stages of high-mass star formation. We launched a new survey for free-free emission from outflow shocks using the Yamaguchi Interferometer (YI) at 8 GHz. We aim to catalog “proto-high-mass protostar” candidates that are still in the low to intermediate-mass phase. We selected starless-like clumps without any 70-μm point source from Traficante et al. (2015). We currently detected 82 sources from 167 clumps. 37 of them are fainter than 20 mJy (down to a few mJy). They tend to associate with colder and denser clumps that are suitable for star formation. This fact suggests that, at least, some of them trace star-formation activities. The highest-density clumps are, in fact, associated with several masers and molecular outflows. Furthermore, some of them have already shown a signature of ongoing cluster formation.

Keywords

ISM:jets and outflowsaccretion disksstars: massivestars: protostars
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 227 - 229
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

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