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Warm dust and gas of massive young stellar objects revealed by Herschel PACS spectroscopy

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

Published online by Cambridge University Press:  12 September 2016

Woojin Kwon ,
Floris F. S. van der Tak ,
Agata Karska ,
Gregory J. Herczeg ,
Luis Chavarría ,
Fabrice Herpin ,
Friedrich Wyrowski ,
Jonathan Braine  and
Ewine F. van Dishoeck
Woojin Kwon
Affiliation:
Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea, email: [email protected] SRON Netherlands Institute for Space Research, Groningen, The Netherlands
Floris F. S. van der Tak
Affiliation:
SRON Netherlands Institute for Space Research, Groningen, The Netherlands Kapteyn Astronomical Institute, University of Groningen, Groningen, The Netherlands
Agata Karska
Affiliation:
Astronomical Observatory, Adam Mickiewicz University, Poznan, Poland Max-Planck Institut für Extraterrestrische Physik (MPE), Garching, Germany Leiden Observatory, Leiden University, Leiden, The Netherlands
Gregory J. Herczeg
Affiliation:
Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing, PR China
Luis Chavarría
Affiliation:
Universidad de Chile - CONICYT, Santiago, Chile
Fabrice Herpin
Affiliation:
Université de Bordeaux, Floirac Cedex, France CNRS, LAB, Floirac Cedex, France
Friedrich Wyrowski
Affiliation:
Max-Planck Institut für Radioastronomie, Bonn, Germany
Jonathan Braine
Affiliation:
Université de Bordeaux, Floirac Cedex, France CNRS, LAB, Floirac Cedex, France
Ewine F. van Dishoeck
Affiliation:
Max-Planck Institut für Extraterrestrische Physik (MPE), Garching, Germany Leiden Observatory, Leiden University, Leiden, The Netherlands
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Abstract

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We present results of Herschel PACS imaging spectroscopy data toward ten massive young stellar objects taken as part of the WISH project. Our sample consists of four high mass protostellar objects (HMPOs), two hot molecular cores (HMCs), and four ultracompact HII regions (UCHIIs), and the spectra cover a broad range of wavelengths (55 to 210 μm) imaged over an ~50” field with 5×5 spaxels. By fitting the continua utilizing a modified black-body formula we estimate mass-weighted dust temperature and column density distributions of warm dust and find that UCHII regions are hottest and HMCs are most deeply embedded. We also estimate rotational temperature and column density distributions of warm CO gas using the rotational diagram analysis, which are comparable over targets in contrast to continuum results. By comparing high J CO line fluxes to the RATRAN estimates of centrally heated envelope models, we find that majority of warm CO originates from bipolar outflow shocks.

Keywords

astrochemistrystars: formationstars: pre–main-sequenceHII regions
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 , E45
Copyright
Copyright © International Astronomical Union 2016 

References

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