Searches for H${}_2$O Masers toward Narrow-Line Seyfert 1 galaxies

Abstract

We present searches for 22 GHz H${}_2$O masers toward 36 narrow-line Seyfert 1 galaxies (NLS1s), selected from known NLS1s with $v_{sys}$ $\lesssim$ 41000 km/s. Out of the 36 NLS1s in our sample, 11 NLS1s have been first surveyed in our observations, while the observations of other NLS1s were previously reported in literature. In our survey, no new water maser source from NLS1s was detected at 3 $\sigma$ rms level of 8.4 mJy to 144 mJy, which depends on different observing conditions or inhomogeneous sensitivities of each observation using three different telescopes. It is likely that non-detection of new masers in our NLS1 sample is primarily due to insufficient sensitivities of our observations. Including the five known NLS1 masers, the total detection rate of the H${}_2$O maser in NLS1s is not remarkably different from that of type 2 Seyfert galaxies or LINERs. However, more extensive and systematic searches of NLS1 would be required for statistical discussion of the detection rate of the NLS1 maser, compared with that of type 2 Seyferts or LINERs.

9 pages, 2 figures, accepted for publication in PASJ on 28/03/2018

References in corpus (11)

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• Obscured Narrow-Line Seyfert 1 Galaxy Candidate Mrk 1388 with Nonthermal Jets

Cited by in corpus (3)

• Scale dependence of galaxy biasing investigated by weak gravitational lensing: An assessment using semi-analytic galaxies and simulated lensing data
• Second Epoch ALMA Observations of 321 GHz Water Maser Emission in NGC 4945 and the Circinus Galaxy
• Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA