ALMA BAND 8 CONTINUUM EMISSION from ORION SOURCE i

Tomoya Hirota, Masahiro N. Machida, Yuko Matsushita, Kazuhito Motogi, Naoko Matsumoto, Mi Kyoung Kim, Ross A. Burns, Mareki Honma

Research output: Contribution to journalArticle

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Abstract

We have measured continuum flux densities of a high-mass protostar candidate, a radio source I in the Orion KL region (Orion Source I) using the Atacama Large Millimeter/Submillimeter Array (ALMA) at band 8 with an angular resolution of 0.″1. The continuum emission at 430, 460, and 490 GHz associated with Source I shows an elongated structure along the northwest-southeast direction perpendicular to the so-called low-velocity bipolar outflow. The deconvolved size of the continuum source, 90 au ×20 au, is consistent with those reported previously at other millimeter/submillimeter wavelengths. The flux density can be well fitted to the optically thick blackbody spectral energy distribution, and the brightness temperature is evaluated to be 700-800 K. It is much lower than that in the case of proton-electron or H- free-free radiations. Our data are consistent with the latest ALMA results by Plambeck & Wright, in which the continuum emission was proposed to arise from the edge-on circumstellar disk via thermal dust emission, unless the continuum source consists of an unresolved structure with a smaller beam filling factor.

Original languageEnglish
Article number238
JournalAstrophysical Journal
Volume833
Issue number2
DOIs
Publication statusPublished - Dec 20 2016

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continuums
brightness temperature
flux density
outflow
radio
protostars
dust
wavelength
electron
spectral energy distribution
angular resolution
low speed
energy
protons
radiation
wavelengths
electrons
distribution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hirota, T., Machida, M. N., Matsushita, Y., Motogi, K., Matsumoto, N., Kim, M. K., ... Honma, M. (2016). ALMA BAND 8 CONTINUUM EMISSION from ORION SOURCE i. Astrophysical Journal, 833(2), [238]. https://doi.org/10.3847/1538-4357/833/2/238

ALMA BAND 8 CONTINUUM EMISSION from ORION SOURCE i. / Hirota, Tomoya; Machida, Masahiro N.; Matsushita, Yuko; Motogi, Kazuhito; Matsumoto, Naoko; Kim, Mi Kyoung; Burns, Ross A.; Honma, Mareki.

In: Astrophysical Journal, Vol. 833, No. 2, 238, 20.12.2016.

Research output: Contribution to journalArticle

Hirota, T, Machida, MN, Matsushita, Y, Motogi, K, Matsumoto, N, Kim, MK, Burns, RA & Honma, M 2016, 'ALMA BAND 8 CONTINUUM EMISSION from ORION SOURCE i', Astrophysical Journal, vol. 833, no. 2, 238. https://doi.org/10.3847/1538-4357/833/2/238
Hirota T, Machida MN, Matsushita Y, Motogi K, Matsumoto N, Kim MK et al. ALMA BAND 8 CONTINUUM EMISSION from ORION SOURCE i. Astrophysical Journal. 2016 Dec 20;833(2). 238. https://doi.org/10.3847/1538-4357/833/2/238
Hirota, Tomoya ; Machida, Masahiro N. ; Matsushita, Yuko ; Motogi, Kazuhito ; Matsumoto, Naoko ; Kim, Mi Kyoung ; Burns, Ross A. ; Honma, Mareki. / ALMA BAND 8 CONTINUUM EMISSION from ORION SOURCE i. In: Astrophysical Journal. 2016 ; Vol. 833, No. 2.
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