A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)
Abstract
We report the results of a systematic survey for 95 GHz class I methanol masers toward a new sample of 192 massive young stellar object candidates associated with ongoing outflows (known as extended green objects or EGOs) identified from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) survey. The observations were made with the Australia Telescope National Facility (ATNF) Mopra 22 m radio telescope and resulted in the detection of 105 new 95 GHz class I methanol masers. For 92 of the sources our observations provide the first identification of a class I maser transition associated with these objects (i.e., they are new class I methanol maser sources). Our survey proves that there is indeed a high detection rate (55%) of class I methanol masers toward EGOs. Comparison of the GLIMPSE point sources associated with EGOs with and without class I methanol maser detections shows that they have similar mid-IR colors, with the majority meeting the color selection criteria -0.6 < [5.8]-[8.0] < 1.4 and 0.5 < [3.6]-[4.5] < 4.0. Investigations of the Infrared Array Camera and Multiband Imaging Photometer for Spitzer 24 {mu}m colors and the associated millimeter dust clump properties (mass and density) of the EGOs formore »
- Authors:
-
- Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 (China)
- School of Mathematics and Physics, University of Tasmania, Hobart, Tasmania (Australia)
- Publication Date:
- OSTI Identifier:
- 21560332
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal, Supplement Series
- Additional Journal Information:
- Journal Volume: 196; Journal Issue: 1; Other Information: DOI: 10.1088/0067-0049/196/1/9; Journal ID: ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLOR; DETECTION; MASERS; MASS; METHANOL; RADIO TELESCOPES; STARS; ALCOHOLS; AMPLIFIERS; ANTENNAS; ELECTRICAL EQUIPMENT; ELECTRONIC EQUIPMENT; EQUIPMENT; HYDROXY COMPOUNDS; MICROWAVE AMPLIFIERS; MICROWAVE EQUIPMENT; OPTICAL PROPERTIES; ORGANIC COMPOUNDS; ORGANOLEPTIC PROPERTIES; PHYSICAL PROPERTIES; RADIO EQUIPMENT; TELESCOPES
Citation Formats
Xi, Chen, Zhiqiang, Shen, Conggui, Gan, Ellingsen, Simon P, and Titmarsh, Anita. A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs). United States: N. p., 2011.
Web. doi:10.1088/0067-0049/196/1/9.
Xi, Chen, Zhiqiang, Shen, Conggui, Gan, Ellingsen, Simon P, & Titmarsh, Anita. A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs). United States. https://doi.org/10.1088/0067-0049/196/1/9
Xi, Chen, Zhiqiang, Shen, Conggui, Gan, Ellingsen, Simon P, and Titmarsh, Anita. 2011.
"A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)". United States. https://doi.org/10.1088/0067-0049/196/1/9.
@article{osti_21560332,
title = {A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD GLIMPSE EXTENDED GREEN OBJECTS (EGOs)},
author = {Xi, Chen and Zhiqiang, Shen and Conggui, Gan and Ellingsen, Simon P and Titmarsh, Anita},
abstractNote = {We report the results of a systematic survey for 95 GHz class I methanol masers toward a new sample of 192 massive young stellar object candidates associated with ongoing outflows (known as extended green objects or EGOs) identified from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) survey. The observations were made with the Australia Telescope National Facility (ATNF) Mopra 22 m radio telescope and resulted in the detection of 105 new 95 GHz class I methanol masers. For 92 of the sources our observations provide the first identification of a class I maser transition associated with these objects (i.e., they are new class I methanol maser sources). Our survey proves that there is indeed a high detection rate (55%) of class I methanol masers toward EGOs. Comparison of the GLIMPSE point sources associated with EGOs with and without class I methanol maser detections shows that they have similar mid-IR colors, with the majority meeting the color selection criteria -0.6 < [5.8]-[8.0] < 1.4 and 0.5 < [3.6]-[4.5] < 4.0. Investigations of the Infrared Array Camera and Multiband Imaging Photometer for Spitzer 24 {mu}m colors and the associated millimeter dust clump properties (mass and density) of the EGOs for the sub-samples based on the class of methanol masers they are associated with suggest that the stellar mass range associated with class I methanol masers extends to lower masses than for class II methanol masers, or alternatively class I methanol masers may be associated with more than one evolutionary phase during the formation of a high-mass star.},
doi = {10.1088/0067-0049/196/1/9},
url = {https://www.osti.gov/biblio/21560332},
journal = {Astrophysical Journal, Supplement Series},
issn = {0067-0049},
number = 1,
volume = 196,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2011},
month = {Thu Sep 01 00:00:00 EDT 2011}
}