TWO-DIMENSIONAL MAPPING OF YOUNG STARS IN THE INNER 180 pc OF NGC 1068: CORRELATION WITH MOLECULAR GAS RING AND STELLAR KINEMATICS
TWO-DIMENSIONAL MAPPING OF YOUNG STARS IN THE INNER 180 pc OF NGC 1068: CORRELATION WITH MOLECULAR GAS RING AND STELLAR KINEMATICS
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NGC 1068 内部 180 片年轻恒星的二维测绘：与分子气环和恒星运动学的相关性
DOI：
10.1088/0004-637x/755/2/87
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
P. Mcgregor
中科院分区：
文献类型：
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作者：
T. Storchi;R. Riffel;R. Riffel;M. R. Diniz;T. B. Vale;P. Mcgregor
我们首次利用近红外积分场光谱技术，以8pc的空间分辨率绘制了NGC 1068内部180 pc（半径）内的恒星种群和非恒星连续体的二维地图。我们将光谱合成技术应用于双子座北望远镜的NIFS仪器和ALTAIR自适应光学模块获得的数据。最近恒星形成的两个阶段被发现主导了恒星群的贡献：第一次发生在300万年前，覆盖了大部分核心区域；第二次发生在30迈前，在距离原子核约100个单位的环状结构中，与H2发射的膨胀环一致。在环内，观测到恒星速度色散的减少，恒星群主要由300迈年龄组成。在内部35pc中，最老的年龄成分（年龄大于或等于2 Gyr）主导质量，而通量由黑体成分主导，其温度在700 K≤T≤800 K范围内，我们将其归因于尘埃环面。我们还发现原子核以外的黑体和幂律分量有一些贡献，我们将其归因于尘埃发射和散射光。
We report the first two-dimensional mapping of the stellar population and non-stellar continua within the inner 180 pc (radius) of NGC 1068 at a spatial resolution of 8 pc, using integral field spectroscopy in the near-infrared. We have applied the technique of spectral synthesis to data obtained with the instrument NIFS and the adaptive optics module ALTAIR at the Gemini North Telescope. Two episodes of recent star formation are found to dominate the stellar population contribution: the first occurred 300 Myr ago, extending over most of the nuclear region; the second occurred just 30 Myr ago, in a ring-like structure at ≈100 pc from the nucleus, where it is coincident with an expanding ring of H2 emission. Inside the ring, where a decrease in the stellar velocity dispersion is observed, the stellar population is dominated by the 300 Myr age component. In the inner 35 pc, the oldest age component (age ⩾ 2 Gyr) dominates the mass, while the flux is dominated by blackbody components with temperatures in the range 700 K ⩽ T ⩽ 800 K which we attribute to the dusty torus. We also find some contribution from blackbody and power-law components beyond the nucleus which we attribute to dust emission and scattered light.