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首页> 外文期刊>The Astrophysical journal >FIRST DETECTION OF MILLIMETER/SUBMILLIMETER EXTRAGALACTIC H_2O MASER EMISSION
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FIRST DETECTION OF MILLIMETER/SUBMILLIMETER EXTRAGALACTIC H_2O MASER EMISSION

机译：毫米/次毫米超银河系H_2O物质排放的首次检测

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摘要

We report the first detection of an extragalactic millimeter wavelength H_2O maser at 183 GHz toward NGC 3079 using the Submillimeter Array (SMA) and a tentative submillimeter wave detection of the 439 GHz maser toward the same source using the James Clerk Maxwell Telescope (JCMT). These H_2O transitions are known to exhibit maser emission in star-forming regions and evolved stars. NGC 3079 is a well-studied nuclear H_2O maser source at 22 GHz with a time-variable peak flux density in the range 3-12 Jy. The 183 GHz H_2O maser emission, with a peak flux density of ～0.5 Jy (7 σ detection), also originates from the nuclear region of NGC 3079 and is spatially coincident with the dust continuum peak at 193 GHz (53 mJy integrated). Peak emission at both 183 and 439 GHz occurs in the same range of velocity as that covered by the 22 GHz spectrum. We estimate the gas-to-dust ratio of the nucleus of NGC 3079 to be ≈150, comparable to the Galactic value of 160. Discovery of maser emission in an active galactic nucleus beyond the long-known 22 GHz transition opens the possibility of future position-resolved radiative transfer modeling of accretion disks and outflows < 1 pc from massive black holes.
机译：我们报告了首次使用亚毫米波阵列（SMA）在183 GHz朝NGC 3079探测到银河外毫米波H_2O maser，并使用James Clerk Maxwell望远镜（JCMT）对同一源对439 GHz maser进行了暂定亚毫米波探测。已知这些H_2O跃迁在恒星形成区和已演化恒星中显示出maser发射。 NGC 3079是一个经过充分研究的22 GHz核H_2O微波激射源，其时变峰值磁通密度在3-12 Jy范围内。 183 GHz H_2O maser发射的峰值通量密度约为0.5 Jy（检测到7σ），也源自NGC 3079的核区域，在空间上与193 GHz的尘埃连续峰（53 mJy积分）重合。 183 GHz和439 GHz处的峰值发射与22 GHz频谱所覆盖的发射速度范围相同。我们估计NGC 3079核的气尘比约为≈150，与160的银河值相当。在已知的22 GHz跃迁之外的活跃银河核中发现maser发射，为未来发展提供了可能性吸积盘的位置解析辐射传递建模和从大量黑洞流出的流量<1 pc。

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