Near-infrared H 2 and continuum survey of Extended Green Objects

Lee, H.-T. and Takami, M. and Duan, H.-Y. and Karr, J. and Su, Y.-N. and Liu, S.-Y. and Froebrich, D. and Yeh, C.C. (2012) Near-infrared H 2 and continuum survey of Extended Green Objects. Astrophysical Journal, Supplement Series, 200 (1). ISSN 0067-0049. (doi: (Full text available)


The Spitzer GLIMPSE survey has revealed a number of "Extended Green Objects" (EGOs) that display extended emission at 4.5 μm. These EGOs are potential candidates for high-mass protostellar outflows. We used high-resolution (<1�) H 2 1-0 S(1) line, K-, and H-band images from the United Kingdom Infrared Telescope to study 34 EGOs to investigate their nature. We found that 12 EGOs exhibit H 2 outflows (two with chains of H 2 knotty structures, five with extended H 2 bipolar structures, three with extended H 2 lobes, and two with pairs of H 2 knots). Of the 12 EGOs with H 2 outflows, three exhibit similar morphologies between the 4.5 μm and H 2 emission. However, the remaining nine EGOs show that the H 2 features are more extended than the continuum features, and the H 2 emission is seldom associated with continuum emission. Furthermore, the morphologies of the near-infrared continuum and 4.5 μm emission are similar to each other for those EGOs with K-band emission, implying that at least part of the IRAC-band continuum emission of EGOs comes from scattered light from the embedded young stellar objects. © 2012. The American Astronomical Society. All rights reserved..

Item Type: Article
Additional information: Unmapped bibliographic data: C7 - 2 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Astrophys. J. Suppl. Ser. [Field not mapped to EPrints] AD - Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan [Field not mapped to EPrints] AD - Department of Earth Sciences, National Taiwan Normal University, Taiwan, Taiwan [Field not mapped to EPrints] AD - Centre for Astrophysics and Planetary Science, University of Kent, Canterbury CT2 7NH, United Kingdom [Field not mapped to EPrints] AD - Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: ISM: jets and outflows, stars: formation
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 21 Jul 2015 09:58 UTC
Last Modified: 22 Jul 2015 14:36 UTC
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