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
TL;DR
This study reports the discovery of water megamasers in obscured active galactic nuclei using radio observations, revealing a higher detection rate than previous surveys and providing new insights into these hidden cosmic objects.
Contribution
It introduces a novel survey method combining X-ray and infrared data to efficiently find obscured AGNs with water megamasers.
Findings
Detected water megamasers in 2 new obscured AGNs
Achieved a 20% detection rate, higher than previous surveys
Tentative detection in a third galaxy
Abstract
Recently a new method to discover obscured active galactic nuclei (AGNs) by utilizing X-ray and Infrared data has been developed. We carried out a survey of H2O maser emission toward ten obscured AGNs with the Nobeyama 45-m telescope. We newly detected the maser emission with the signal-noise-ratio (SNR) of above 4 from two AGNs, NGC 1402 and NGC 7738. We also found a tentative detection with its SNR > 3 in NGC 5037. The detection rate of 20% is higher than those of previous surveys (usually several percents).
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