Variability of Water Megamasers in AGN

Publications of the Astronomical Society of Australia

Philip Maloney¹ 

关键词: galaxies: Seyfert;    masers;    molecular processes;   

DOI  :  10.1071/AS01106

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

Powerful water masers have been detected in 23 active galactic nuclei (AGN) to date. Most of the sources that have been monitored show evidence for variability, which may be either intrinsic (response of the masers to a time-varying pump or background source) or extrinsic (the effects of scintillation in the interstellar medium of the Galaxy). I briefly review the examples in which these mechanisms may be operating (interstellar scintillation in the Circinus galaxy, a time-varying background source in Mrk 348, and a time-varying AGN luminosity in NGC 1068).

【 授权许可】

Unknown