Extremely High Excitation SiO Lines in Disk-outflow Systems in Orion Source i

Mi Kyoung Kim, Tomoya Hirota, Masahiro Machida, Yuko Matsushita, Kazuhito Motogi, Naoko Matsumoto, Mareki Honma

Research output: Contribution to journalArticle

Abstract

We present high-resolution images of the submillimeter SiO line emissions of a massive young stellar object Orion Source I using the Atacama Large Millimeter/submillimeter Array at band 8. We detected the 464 GHz SiO v = 4 J = 11-10 line in Source I, which is the first detection of the SiO v = 4 line in star-forming regions, together with the 465 GHz 29 SiO v = 2 J = 11-10 and the 428 GHz SiO v = 2 J = 10-9 lines with a resolution of 50 au. The 29 SiO v = 2 J = 11-10 and SiO v = 4 J = 11-10 lines have compact structures with a diameter of <80 au. The spatial and velocity distributions suggest that the line emissions are associated with the base of the outflow and the surface of the edge-on disk. In contrast, SiO v = 2 J = 10-9 emission shows a bipolar structure in the direction of northeast-southwest low-velocity outflow with a ∼200 au scale. The emission line exhibits a velocity gradient along the direction of the disk elongation. With the assumption of the ring structure with Keplerian rotation, we estimated the lower limit of the central mass to be 7 M o and the radius to be 12 au < r < 26 au.

Original languageEnglish
Article number64
JournalAstrophysical Journal
Volume872
Issue number1
DOIs
Publication statusPublished - Feb 10 2019

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outflow
excitation
ring structures
image resolution
elongation
low speed
spatial distribution
velocity distribution
stars
gradients
radii
high resolution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, M. K., Hirota, T., Machida, M., Matsushita, Y., Motogi, K., Matsumoto, N., & Honma, M. (2019). Extremely High Excitation SiO Lines in Disk-outflow Systems in Orion Source i. Astrophysical Journal, 872(1), [64]. https://doi.org/10.3847/1538-4357/aafb6b

Extremely High Excitation SiO Lines in Disk-outflow Systems in Orion Source i. / Kim, Mi Kyoung; Hirota, Tomoya; Machida, Masahiro; Matsushita, Yuko; Motogi, Kazuhito; Matsumoto, Naoko; Honma, Mareki.

In: Astrophysical Journal, Vol. 872, No. 1, 64, 10.02.2019.

Research output: Contribution to journalArticle

Kim, MK, Hirota, T, Machida, M, Matsushita, Y, Motogi, K, Matsumoto, N & Honma, M 2019, 'Extremely High Excitation SiO Lines in Disk-outflow Systems in Orion Source i', Astrophysical Journal, vol. 872, no. 1, 64. https://doi.org/10.3847/1538-4357/aafb6b
Kim, Mi Kyoung ; Hirota, Tomoya ; Machida, Masahiro ; Matsushita, Yuko ; Motogi, Kazuhito ; Matsumoto, Naoko ; Honma, Mareki. / Extremely High Excitation SiO Lines in Disk-outflow Systems in Orion Source i. In: Astrophysical Journal. 2019 ; Vol. 872, No. 1.
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