具有大尺度类转动Hα辐射的中等质量黑洞的环形矮星系LINER 1
A Ringed Dwarf LINER 1 Galaxy Hosting an Intermediate-mass Black Hole with Large-scale Rotation-like Hα Emission
摘要：
我们报道了在SDSS J 083803.68 +540642.0中发现的20 kpc大小的Hα辐射。SDSS J 083803.68 +540642.0是一个环形矮星系（M $_V$ = -17.89等），其中有一个吸积的中等质量黑洞，z=0.02957。对HST图像的分析表明，它是一个早期类型的星系，具有无特征的低表面亮度盘（V波段μ0 = 20.39 mag arcsec $^{-2}$）和突出的相对红色的隆起（V-I = 2.03，Re = 0.28 kpc或0.28 kpc）。”48），占I波段总光的约81%。还探测到一个直径为16千秒差距的环星系环，其南侧呈分散状。光发射谱线表明原子核是一条宽线LINER。我们的MMT长缝观测表明，扩展Hα发射的运动学与旋转气体盘一致，平均蓝移速度为162 km s $^{-1}$，平均红移速度为86 km s $^{-1}$ .根据我们的光致电离计算，大尺度Hα辐射不太可能是由中心核或散布在古老恒星星族中的热演化（后AGB）恒星提供动力，而是由原位恒星形成提供动力;扩展辐射的线比诊断证明了这一点。我们认为，无论是环和大规模的Hα发射气体的碰撞，然后合并与一个丰富的气体星系的质量相当的潮汐吸积创建。
英文摘要：
We report the discovery of a 20-kpc-sized Hα emission in SDSS J083803.68+540642.0, a ringed dwarf galaxy (M$_V$ = -17.89 mag) hosting an accreting intermediate-mass black hole at z=0.02957. Analysis of the HST images indicates that it is an early-type galaxy with a featureless low-surface brightness disk (μ0 = 20.39 mag arcsec$^{-2}$ in the V band) and a prominent, relatively red bulge (V - I = 2.03, Re = 0.28 kpc or 0."48) that accounts for ~81% of the total light in the I band. A circumgalactic ring of a diameter 16 kpc is also detected, with a disperse shape on its south side. The optical emission lines reveal the nucleus to be a broad-line LINER. Our MMT longslit observation indicates that the kinematics of the extended Hα emission is consistent with a rotational gaseous disk, with a mean blueshifted velocity of 162 km s$^{-1}$ and mean redshifted velocity of 86 km s$^{-1}$ . According to our photoionization calculations, the large-scale Hα emission is unlikely to be powered by the central nucleus or by hot evolved (post-AGB) stars interspersed in the old stellar populations, but by in situ star formation; this is vindicated by the line-ratio diagnostic of the extended emission. We propose that both the ring and large-scale Hα-emitting gas are created by the tidal accretion in a collision-and then merger-with a gas-rich galaxy of a comparable mass.
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