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SIMULTANEOUS OBSERVATIONS OF H2O AND SIO MASERS TOWARD KNOWN EXTRAGALACTIC WATER MASER SOURCES

  • CHO, SE-HYUNG ;
  • YOON, DONG-HWAN ;
  • KIM, JAEHEON ;
  • BYUN, DO-YOUNG ;
  • WAGNER, JAN
  • Received : 2015.11.16
  • Accepted : 2015.12.06
  • Published : 2015.12.31

Abstract

We observe ten known 22GHz H2O maser galaxies during February 19-22, 2011 using the 21 m Tamna telescope of the Korean VLBI Network and a new wide-band digital spectrometer. Simultaneously we searched for 43GHz SiO v = 1, 2, J = 1-0 maser emission. We detect H2O maser emission towards five sources (M 33, NGC 1052, NGC 1068, NGC 4258, M 82), with non-detections towards the remaining sources (UGC 3193, UGC 3789, Antennae H2O-West, M 51, NGC 6323) likely due to sensitivity. Our 22GHz spectra are consistent with earlier findings. Our simultaneous 43GHz SiO maser search produced non-detections, yielding - for the first time - upper limits on the 43GHz SiO maser emission in these sources at a 3 σ sensitivity level of 0.018K-0.033K (0.24 Jy-0.44 Jy) in a 1.75 km s−1 velocity resolution. Our findings suggest that any 43GHz SiO masers in these sources (some having starburst-associated H2O kilomasers) must be faint compared to the 22GHz H2O maser emission.

Keywords

galaxies;active — galaxies;nuclei — ISM;molecules — masers — radio lines;galaxies

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Acknowledgement

Grant : 우주탄생과 진화연구