Seyfert和FIR明亮星系中的新H2O脉泽。III。南方样本
New H2O masers in Seyfert and FIR bright galaxies. III. The Southern Sample
摘要：
最近，在一个完整的星系样本（Dec>-30度）中进行了两次22 GHz脉泽巡天，100微米通量密度> 50 Jy和> 30 Jy，结果建立了水脉泽探测率与远红外（FIR）通量密度之间的关系。这项调查已扩大到南星系，以发现新的脉泽源，并调查星系托管的脉泽斑点，特别强调其核区域。为了寻找水脉泽发射，用位于Tidbinbilla（澳大利亚）的堪培拉深空通信中心（CDSCC）的70米望远镜观测了12个Dec<-30度和S（100微米）>50 Jy的星系样本。对于0.42 km/s的通道，调查的平均3 σ噪声水平为15 mJy，对应于25 Mpc距离处各向同性脉泽光度的~0.1太阳光度的检测阈值。本文报道了两个新的探测结果：在NGC 3620中发现了一个具有各向同性光度L_H_2O ~5的千脉泽，在合并系统NGC 3256中发现了一个具有约两倍于此光度的脉泽。通过澳大利亚望远镜紧凑阵列（ATCA）进行的连续谱和谱线干涉观测对探测结果进行了跟踪。在NGC 3256中，一小部分（约三分之一）的脉泽辐射来自于两个与恒星形成活动有关的热点，这两个热点与星系核偏离。剩余的辐射可能来自分布在中心50弧秒的脉泽活动的较弱中心。[删节]
英文摘要：
Recently, a relationship between the water maser detection rate and far infrared (FIR) flux densities has been established as a result of two 22 GHz maser surveys in a complete sample of galaxies (Dec>-30 degree) with 100 micron flux densities of > 50 Jy and > 30 Jy. This survey has been extended to the southern galaxies in order to discover new maser sources and to investigate the galaxies hosting the maser spots with particular emphasis on their nuclear regions. A sample of 12 galaxies with Dec<-30 degree and S(100 micron)>50 Jy was observed with the 70-m telescope of the Canberra Deep Space Communication Complex (CDSCC) at Tidbinbilla (Australia) in a search for water maser emission. The average 3 sigma noise level of the survey is 15 mJy for a 0.42 km/s channel, corresponding to a detection threshold of ~0.1 solar luminosities for the isotropic maser luminosity at a distance of 25 Mpc. Two new detections are reported: a kilomaser with an isotropic luminosity L_H2O ~5 solar luminosities in NGC3620 and a maser with about twice this luminosity in the merger system NGC3256. The detections have been followed-up through continuum and spectral line interferometric observations with the Australia Telescope Compact Array (ATCA). In NGC3256, a fraction (about a third) of the maser emission arises from two hot spots associated with star formation activity, which are offset from the galactic nuclei of the system. The remaining emission may arise from weaker centers of maser activity distributed over the central 50 arcsec. [abridged]
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