Discovery of H2O megamasers in obscured active galactic nuclei

Aya Yamauchi,Yusuke Miyamoto,Naomasa Nakai,Yuichi Terashima,Taishi Okumura, Bin Zhou,Kotomi Taniguchi,Hiroyuki Kaneko,Naoko Matsumoto,Dragan Salak,Atsushi Nishimura,Saeko Ueno

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN（2017）

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摘要

A new method to discover obscured active galactic nuclei (AGNs) by utilizing X-ray and infrared data has recently been developed. We carried out a survey of H2O maser emission toward 10 obscured AGNs with the Nobeyama 45 m telescope. We newly detected the maser emission with a signal-noise-ratio (SNR) of above 4 from two AGNs; NGC 1402 and NGC 7738. We also found a tentative detection with SNR > 3 in NGC 5037. The detection rate of 20% is higher than those of previous surveys (usually several percent).

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关键词

galaxies: active,galaxies:individual (NGC 1402, NGC 5037, NGC 7738),galaxies: nuclei,masers

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