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A survey for OH masers in H2O maser galaxies with the Effelsberg and Green Bank radio telescopes

Published online by Cambridge University Press:  16 July 2018

Elisabetta Ladu ,
Andrea Tarchi ,
Paola Castangia ,
Gabriele Surcis  and
Christian Henkel
Elisabetta Ladu
Affiliation:
Dipartimento di Fisica, Università degli Studi di Cagliari, S.P.Monserrato- Sestu km 0,700, I-09042 Monserrato (CA), Italy email: ladueli91@gmail.com
Andrea Tarchi
Affiliation:
INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy
Paola Castangia
Affiliation:
INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy
Gabriele Surcis
Affiliation:
INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, 09047, Selargius (CA), Italy
Christian Henkel
Affiliation:
Astronomy Departement, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
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Abstract

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We present a search for OH maser emission in galaxies hosting H2O masers with the 100-m Effelsberg radio telescope and the Green Bank Telescope (GBT). This survey is aimed at investigating the apparent rarity and/or possible mutual exclusion of megamaser emission from OH and H2O in the same galaxy. Our study establishes new and better upper limits on the OH maser luminosity. Our work duplicates the number of H2O masers searched for OH emission. No new maser detections have been found. OH absorption, both in the 1667 and 1665 MHz transitions, is instead detected in two galaxies of the sample, IC342 and NGG5793.

Keywords

maserstechniques:spectroscopicsurveysISM:moleculesgalaxies:active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 137 - 138
Copyright
Copyright © International Astronomical Union 2018 

References

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Wagner, J., 2013, A&A, 560A, 12Google Scholar
Wiggins, Brandon K. & Migenes, Victor, & Smidt, Joseph M., 2016, ApJ, 816, 55CrossRefGoogle Scholar