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1 results

  • KVN Single-dish Water and Methanol Maser Line Surveys of Galactic YSOs

  • Kee-Tae Kim, Do-Young Byun, Jae-Han Bae, Won-Ju Kim, Hyun-Woo Kang, Chung Sik Oh, So-Young Youn
  • Journal:
    Proceedings of the International Astronomical Union / Volume 8 / Issue S287 / January 2012
    Published online by Cambridge University Press:
    24 July 2012, pp. 488-491
    Print publication:
    January 2012
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  • We have carried out simultaneous 22 GHz H2O and 44 GHz Class I CH3OH maser line surveys of more than 1500 intermediate- and high-mass YSOs in the Galaxy using newly-constructed KVN 21-m telescopes. As the central (proto)stars evolve, the detection rates of the two masers rapidly decrease for intermediate-mass YSOs while the rates increase for high-mass YSOs. These results suggest that the occurrence of the two masers is closely related both to the evolutionary stage of the central objects and to the circumstellar environments. CH3OH masers always have very similar velocities (<10 km s−1) to the natal dense cores, whereas H2O masers often have significantly different velocities. The isotropic luminosities of both masers are well correlated with the bolometric luminosities of the central (proto)stars.