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A Multiwavelengh study towards Galactic HII region G10.32-0.26

Published online by Cambridge University Press:  07 February 2024

Mi Kyoung Kim Open the ORCID record for Mi Kyoung Kim [Opens in a new window] ,
Tomoya Hirota Open the ORCID record for Tomoya Hirota [Opens in a new window] ,
Kee-Tae Kim  and
KaVA SFR sub Working Group
Mi Kyoung Kim*
Affiliation:
Otsuma Women’s University, 12 Sanban-cho, Chiyoda-ku, Tokyo, 102-8357, Japan.
Tomoya Hirota
Affiliation:
Otsuma Women’s University, 12 Sanban-cho, Chiyoda-ku, Tokyo, 102-8357, Japan.
Kee-Tae Kim
Affiliation:
National Astronomical Observatory of Japan, Oshu-shi, Iwate 023-0861, Japan The Graduated University for Advanced Studies
KaVA SFR sub Working Group
Affiliation:
4Korea Astronomy & Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea
*
email: [email protected]
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Abstract

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We present the results of high-resolution continuum and molecular line observations towards the Galactic HII region, G10.32-0.26. The continuum map with ALMA reveals the five cores with masses ranging from 2.5–9.2 Me. The results show that the brightest peak, Peak 1, is an HCHII region with an excitation temperature of : 12000 K, an electron density of 3.4×107 cm3, and a radius of 14 au. The central object is estimated to be a B0.5 star. The class II 6.7 GHz CH3OH maser coincides with Peak 1, implying class II CH3OH maser is associated with a later evolutionary stage of star formation. Using KaVA and KVN observation, we detect the class I 44 and 95 GHz CH3OH masers near the weakest peak, Peak 5. We successfully imaged class I 95 GHz CH3OH masers with VLBI for the first time. In Peak 5, the high-velocity SiO emission also exists. The continuum emission can be modelled with grey-body dust emission with Td∼30 K, and the molecular species are poor near Peak 5, suggesting Peak 5 is in an early stage of star formation.

Keywords

Star formationHII regionMasers
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. 224 - 226
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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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