Seyfert和FIR明亮星系中的新水脉泽。IV。干涉测量随访
New water masers in Seyfert and FIR bright galaxies. IV. Interferometric follow-ups
摘要：
非常明亮的河外水脉泽（megamaser）与星系中的活动星系核（AGN）有关，其特征是吸积盘、射电喷流和核流出。较弱的脉泽，即千脉泽，似乎主要与恒星形成活动有关，尽管其中一些来源可能属于活动星系核脉泽分布的弱尾。这是特别重要的，以准确地定位水脉泽发射，以揭示其来源和阐明河外恒星形成活动或阐明高度模糊的星系中心区域。我们对NGC3556、Arp 299和NGC4151这三个发现有水辐射的星系进行了干涉观测，并利用统计方法研究了星系中OH与水脉泽辐射之间的关系。NGC3556中的脉泽与一个紧凑的射电连续源有关，它很可能是超新星遗迹或射电超新星。在Arp 299中，发光水脉泽被分解为三个主要的发射区，它们与系统的两个主要星系NGC 3690和IC 694的核区以及重叠区有关。在NGC4151中，只有一个先前观察到的脉泽成分已被暂时检测到。这个特征，如果是真的，与星系的中心区域有关。到目前为止，唯一一个可以确信地探测到OH和H2O两种脉泽物质的发光脉泽发射的星系是Arp 299。来自这两个物种的较弱脉泽确实共存于一些物体中。然而，为了更好地评估后两个结果，需要搜索更多的两种脉泽物质。
英文摘要：
Very luminous extragalactic water masers, the megamasers, are associated with active galactic nuclei (AGN) in galaxies characterized by accretion disks, radio jets, and nuclear outflows. Weaker masers, the kilomasers, seem to be mostly related to star formation activity, although the possibility exists that some of these sources may belong to the weak tail of the AGN maser distribution. It is of particular importance to accurately locate the water maser emission to reveal its origin and shed light onto extragalactic star forming activity or to elucidate the highly obscured central regions of galaxies. We performed interferometric observations of three galaxies, NGC3556, Arp299, and NGC4151, where water emission was found. Statistical tools have been used to study the relation between OH and water maser emission in galaxies. The maser in NGC3556 is associated with a compact radio continuum source that is most likely a supernova remnant or radio supernova. In Arp299, the luminous water maser has been decomposed in three main emitting regions associated with the nuclear regions of the two main galaxies of the system, NGC3690 and IC694, and the region of overlap. In NGC4151, only one of the two previously observed maser components has been tentatively detected. This feature, if real, is associated with the galaxy's central region. The only galaxy, so far, where luminous maser emission from two maser species, OH and H2O has been confidently detected is Arp299. Weaker masers from these two species do instead coexist in a number of objects. A larger number of objects searched for both maser species are, however, necessary to better assess these last two results.
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