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Investigating formation of isolated intermediate/massive YSOs in the LMC

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Ryohei Harada ,
Toshikazu Onishi ,
Annie Hughes ,
Margaret Meixner ,
Marta Sewilo ,
Remy Indebetouw ,
Omnarayani Nayak ,
Kazuki Tokuda ,
Yuuki Morioka  and
Yasuo Fukui
...Show all authors
Ryohei Harada
Affiliation:
Department of Physical Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan email: s_r.harada@p.s.osakafu-u.ac.jp
Toshikazu Onishi
Affiliation:
Department of Physical Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan email: s_r.harada@p.s.osakafu-u.ac.jp
Annie Hughes
Affiliation:
Max Planck Institute for Radio Astronomy, Auf dem Huegel 69, Bonn 53121, Germany
Margaret Meixner
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Marta Sewilo
Affiliation:
Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA
Remy Indebetouw
Affiliation:
Department of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903-0818, USA
Omnarayani Nayak
Affiliation:
The Johns Hopkins University, Department of Physics and Astronomy, 366 Bloomberg Center, 3400 N. Charles Street, Baltimore, MD 21218, USA
Kazuki Tokuda
Affiliation:
Department of Physical Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan email: s_r.harada@p.s.osakafu-u.ac.jp
Yuuki Morioka
Affiliation:
Department of Physical Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan email: s_r.harada@p.s.osakafu-u.ac.jp
Yasuo Fukui
Affiliation:
Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Akiko Kawamura
Affiliation:
National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
Tony Wong
Affiliation:
Astronomy Department, University of Illinois, Urbana, IL 61801, USA
Jean-Philippe Bernard
Affiliation:
Université de Toulouse, UPS, CESR, 9 avenue du colonel Roche, 31028 Toulouse Cedex 4, France
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Abstract

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High-mass stars usually form in giant molecular clouds (GMCs) as part of a young stellar cluster, but some isolated O/B stars are observed. What are the initial conditions that lead to the formation of these objects? The aim of this study is to measure the distribution and basic physical properties of the neutral gas associated with isolated intermediate- and high-mass young stellar objects (YSOs) in the Large Magellanic Cloud.

As part of the SAGE Spitzer Legacy program for the LMC, we have identified and confirmed YSOs using Spitzer IRAC photometry and IRS spectroscopy. By examining the spatial coincidence between the YSOs and 12CO(1–0) emission detected by the NANTEN mapping survey, we identified more than one hundred intermediate/massive YSOs in the LMC that appear to be isolated, i.e. not associated with CO emission. Deeper follow-up CO observations by our team with the higher resolution by Mopra Telescope (beam=30”) detected CO emission at the YSO positions for ~80% of the isolated LMC YSOs. We obtained ALMA data of some of the targets during Cycle 2. We targeted a small but representative (in terms of their association with neutral gas tracers) sample of the isolated high-mass YSOs that we have been studying in the LMC. All of our 12 targets are separated by more than 200 pc from known CO clouds. Our analysis of the ALMA data shows that a compact molecular cloud whose mass is a few thousand solar masses or smaller is associated with most of the YSOs.

Keywords

ISM: cloudsstars: formationradio lines: ISM
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E32
Copyright
Copyright © International Astronomical Union 2016 

References

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