作为Mrk1066低速弥散核环起源的中龄星
Intermediate age stars as origin of the low velocity dispersion nuclear ring in Mrk1066
摘要：
报道了一个活动星系Mrk 1066核区近红外波段的首次二维恒星星族合成。我们已经使用积分场光谱与自适应光学在双子座北望远镜映射的年龄分布的恒星星族在内部300 pc的空间分辨率为35 pc。一个古老的恒星星族组成部分（年龄> 5 Gyr）是占主导地位的内部~ 160 pc，我们归因于星系的隆起。在这个区域之外，直到观测场的边界（约300 pc），中间年龄成分（0.3- 0.7 Gyr）占主导地位。我们发现这个中间年龄的组成部分和低恒星速度色散（西格玛）的部分环之间的空间相关性。在其他活动星系中也观察到了低σ核环，我们对Mrk 1066的研究结果表明，它们是由中等年龄的恒星形成的。这个年龄与低σ环的起源是一致的，在过去的事件中，触发了气体的流入，并形成了恒星，这些恒星仍然保持着形成它们的气体的较冷运动学（与凸起相比）。此外，我们还探测到了两个未解决的核心部分：一个是紧凑的红外源，与质量约为1.9 × 10 ^{-2} M_Sun的热尘埃的起源相一致;另一个是蓝色的无特征的幂律连续体，它在2.12微米处的通量中只占15%。
英文摘要：
We report the first two-dimensional stellar population synthesis in the near-infrared of the nuclear region of an active galaxy, namely Mrk1066. We have used integral field spectroscopy with adaptive optics at the Gemini North Telescope to map the to map the age distribution of the stellar population in the inner 300 pc at a spatial resolution of 35 pc. An old stellar population component (age >5Gyr) is dominant within the inner ~160pc, which we attribute to the galaxy bulge. Beyond this region, up to the borders of the observation field (~300 pc), intermediate age components (0.3-0.7Gyr) dominate. We find a spatial correlation between this intermediate age component and a partial ring of low stellar velocity dispersions (sigma). Low-sigma nuclear rings have been observed in other active galaxies and our result for Mrk1066 suggests that they are formed by intermediate age stars. This age is consistent with an origin for the low-sigma rings in a past event which triggered an inflow of gas and formed stars which still keep the colder kinematics (as compared to that of the bulge) of the gas from which they have formed. At the nucleus proper we detect, in addition, two unresolved components: a compact infrared source, consistent with an origin in hot dust with mass ~1.9x10^{-2} M_Sun, and a blue featureless power-law continuum, which contributes with only ~15% of the flux at 2.12 microns.
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