Searches for H2O masers toward narrow-line Seyfert 1 galaxies
Searches for H2O masers toward narrow-line Seyfert 1 galaxies
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DOI：
10.1093/pasj/psy046
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发表时间：
2018-05
影响因子：
2.3
通讯作者：
Y. Hagiwara;A. Doi;K. Hachisuka;S. Horiuchi
中科院分区：
文献类型：
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作者：
Y. Hagiwara;A. Doi;K. Hachisuka;S. Horiuchi
我们提出了对36个窄带塞弗特1星系（nls1）的22 GHz H $_2$ O脉泽的搜索，这些星系是从已知的nls1中选择出来的，速度为$v_{sys}$$\lesssim$ 41000 km/s。在我们样本中的36个nls1中，有11个nls1是在我们的观察中首次调查的，而其他nls1的观察在文献中已经报道过。在我们的调查中，在8.4 mJy至144 mJy的3 $\sigma$ rms水平上，没有发现来自nls1的新的水激源，这取决于不同的观测条件或使用三种不同望远镜的每次观测灵敏度的不均匀性。在我们的NLS1样本中未检测到新的脉泽可能主要是由于我们观察的灵敏度不足。包括已知的5个NLS1脉泽在内，NLS1中H $_2$ O脉泽的总检出率与2型塞弗特星系或liner的检出率没有显著差异。然而，与2型Seyferts或liner相比，NLS1脉泽的检出率的统计讨论需要对NLS1进行更广泛和系统的搜索。
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.