四只热狗被EVN吃掉了
Four hot DOGs eaten up with the EVN
摘要：
热尘遮蔽星系（英语：Hot dust obscured galaxies，缩写：HOT DOG）是一种罕见的超亮红外星系，最近被WISE卫星发现。在全天空的1000个成员中，大多数应该是在高红移（z~2-3），在宇宙历史上恒星形成的高峰期。这类星系很可能代表了星系合并和演化过程中的一个短暂阶段，即从恒星暴增到活动星系核主导的阶段。我们首次利用欧洲VLBI网络（EVN）在1.7 GHz观测到了4个具有mJy级射电辐射的热DOG，希望能找到活动星系核活动的致密射电特征。所有四个目标源都在~15-30 mas角分辨率下被探测到，证实了活动核的存在。这些源是空间分辨的，即VLBI探测到的分量的通量密度小于总通量密度，这表明一小部分射电辐射来自大尺度（部分与星暴有关）活动。在这里，我们展示了我们在2014年2月进行的e-EVN观测的初步结果，并更详细地讨论了WISE J1814+3412，一个具有kpc尺度对称射电结构的天体。
英文摘要：
Hot dust-obscured galaxies (hot DOGs) are a rare class of hyperluminous infrared galaxies recently identified with the Wide-field Infrared Survey Explorer (WISE) satellite. The majority of the ~1000-member all-sky population should be at high redshifts (z~2-3), at the peak of star formation in the history of the Universe. This class most likely represents a short phase during galaxy merging and evolution, a transition from starburst- to AGN-dominated phases. For the first time, we observed four hot DOGs with known mJy-level radio emission using the European VLBI Network (EVN) at 1.7 GHz, in a hope to find compact radio features characteristic to AGN activity. All four target sources are detected at ~15-30 mas angular resolution, confirming the presence of an active nucleus. The sources are spatially resolved, i.e. the flux density of the VLBI-detected components is smaller than the total flux density, suggesting that a fraction of the radio emission originates from larger-scale (partly starburst-related) activity. Here we show the preliminary results of our e-EVN observations made in 2014 February, and discuss WISE J1814+3412, an object with kpc-scale symmetric radio structure, in more detail.
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