OH超脉泽星系IRAS11506-3851：多波长观测揭示的一个AGN和恒星形成
The OH Megamaser galaxy IRAS11506-3851: an AGN and starformation revealed by multiwavelength observations
摘要：
介绍了双子座多目标摄谱仪（GMOS）积分场单元（IFU）、哈勃空间望远镜（HST）和甚大阵（VLA）对OH超脉泽（OHM）星系IRAS 11506-3851的观测结果。HST图像揭示了一个孤立的螺旋星系，结合GMOS-IFU通量分布和VLA数据，我们可以识别出围绕核的恒星形成区域的部分环，半径约为500 pc。虽然这个环显示出星暴激发和低速色散，但环内部的区域显示出更高的激发和速度色散值，其值在距离核约240 pc处向其边界增加，类似于投射的气泡。这个气泡的增强激发和速度色散围绕着8.5 GHz的无线电发射结构，支持其起源于一个微弱的活动星系核，该活动星系核主要通过现阶段无线电中看到的等离子体喷射来冲击周围的气体。这是我们迄今为止研究的5 OHM星系中的第四个（从我们的15 OHM样本中），GMOS-IFU数据表明在核心存在一个以前未知的微弱AGN，这与OHM星系最近触发AGN的假设一致。
英文摘要：
We present Gemini Multi-Object Spectrograph (GMOS) Integral Field Unit (IFU), Hubble Space Telescope (HST) and Very Large Array (VLA) observations of the OH Megamaser (OHM) galaxy IRAS 11506-3851. The HST images reveal an isolated spiral galaxy and the combination with the GMOS-IFU flux distributions and VLA data allow us to identify a partial ring of star-forming regions surrounding the nucleus with a radius of ~ 500 pc. While this ring shows starburst excitation and low velocity dispersion, the region internal to the ring shows higher excitation and velocity dispersion values, with values increasing towards its borders at ~ 240 pc from the nucleus, resembling a projected bubble. The enhanced excitation and velocity dispersion of this bubble surrounds a 8.5 GHz radio emission structure, supporting its origin in a faint AGN that is mostly shocking the surrounding gas via a plasma ejection seen in radio at the present stage. This is the fourth of the 5 OHM galaxies we have studied so far (from our sample of 15 OHM) for which GMOS-IFU data indicate the presence of a previously unknown faint AGN at the nucleus, consistent with the hypothesis that OHM galaxies harbor recently triggered AGN.
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