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Multi-epoch water maser survey towards low-mass YSOs

Published online by Cambridge University Press:  03 August 2017

Ray S. Furuya
Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125, Firenze, Italy
Yoshimi Kitamura
Institute of Space and Astronautical Science, Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
Alwyn Wootten
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
Mark J. Claussen
National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA
Ryohei Kawabe
Nobeyama Radio Observatory, Nobeyama 411, Minamimaki, Minamisaku, Nagano 384-1305, Japan


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We present the results from a series of multi-epoch 22 GHz H2O maser surveys with the Nobeyama 45 m telescope and the VLA towards low-mass young stellar objects, including all the class 0 sources in the northern sky. Our Nobeyama 45 m survey is the deepest survey - down to an isotopic H2O luminosity of ∼ 10−13L - performed so far. From this survey, we obtained the following results. (1) Class 0 sources show high H2O maser activity: our derived detection rates are ∼ 38% for class 0, but only ∼ 4% for class I sources. (2) Activity of the H2O masers is more likely related to 100 AU scale ionized jets than to large scale molecular outflows.

Part 1. Star Formation
Copyright © Astronomical Society of the Pacific 2002 


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