Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-23T19:55:01.389Z Has data issue: false hasContentIssue false
  • English
  • Français

A Face-on Accretion System in High Mass Star-Formation: Possible Dusty Infall Streams within 100 Astronomical Unit

Published online by Cambridge University Press:  16 July 2018

Kazuhito Motogi ,
Tomoya Hirota ,
Kazuo Sorai ,
Yoshinori Yonekura ,
Koichiro Sugiyama ,
Mareki Honma ,
Kotaro Niinuma ,
Kazuya Hachisuka ,
Kenta Fujisawa  and
Andrew J. Walsh
Kazuhito Motogi
Affiliation:
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8512, Japan email: [email protected]
Tomoya Hirota
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan Department of Astronomical Sciences, SOKENDAI (The Graduate University for Advanced Studies), Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan
Kazuo Sorai
Affiliation:
Department of Physics, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan Department of Cosmosciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
Yoshinori Yonekura
Affiliation:
Center for Astronomy, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan
Koichiro Sugiyama
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan
Mareki Honma
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Hoshigaoka 2-12, Mizusawa, Oshu, Iwate 023-0861, Japan
Kotaro Niinuma
Affiliation:
Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8512, Japan email: [email protected]
Kazuya Hachisuka
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Hoshigaoka 2-12, Mizusawa, Oshu, Iwate 023-0861, Japan
Kenta Fujisawa
Affiliation:
The Research Institute for Time Studies, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8511, Japan
Andrew J. Walsh
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We report on interferometric observations of a face-on accretion system around the high mass young stellar object, G353.273+0.641. The innermost accretion system of 100-au radius was resolved in a 45-GHz continuum image taken with the Jansky Very Large Array. Our SED analysis indicated that the continuum could be explained by optically-thick dust emission. 6.7 GHz CH3OH masers associated with the same system were also observed with the Australia Telescope Compact Array. The masers showed a spiral-like, non-axisymmetric distribution with a systematic velocity gradient. The line-of-sight velocity field is explained by an infall motion along a parabolic streamline that falls onto the equatorial plane of the face-on system. The streamline is quasi-radial and reaches the equatorial plane at a radius of 16 au. The physical origin of such a streamline is still an open question and will be constrained by the higher-resolution thermal continuum and line observations with ALMA long baselines.

Keywords

ISM: individual objects (G353.273+0.641)–molecules–masers–radio continuum: ISM–stars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 267 - 270
Copyright
Copyright © International Astronomical Union 2017 

References

Beltrán, M. T. & de Wit, W. J., 2016, A&A Rv, 24, 6Google Scholar
Caswell, J. L. & Phillips, C. J., 2008, MNRAS, 386, 1521Google Scholar
Cragg, D. M., Sobolev, A. M., & Godfrey, P. D., 2005, MNRAS, 360, 533Google Scholar
Goddi, C., Moscadelli, L., & Sanna, A., 2011, A&A, 535, L8Google Scholar
Motogi, K., Sorai, K., Niinuma, K., et al., 2013, MNRAS, 428, 349Google Scholar
Motogi, K., Sorai, K., Honma, M., et al., 2016, PASJ, 68, 69Google Scholar
Motogi, K., Hirota, T., Sorai, K., et al., 2017, ApJ, 849, 23Google Scholar
Yen, H.-W., Takakuwa, S., Ohashi, N., et al., 2014, ApJ, 793, 1Google Scholar