论文标题
NGC 1316（Fornax a）的灰尘和气体 - 其起源和自然
Dust and gas in the central region of NGC 1316 (Fornax A) -- Its origin and nature
论文作者
论文摘要
早期型Galaxy NGC 1316在5 kpc的中央半径内占据了约10^7个太阳质量。这些突出的灰尘结构被认为具有外部起源，这也是对其他尘土飞扬的早期型星系的流行解释。我们使用档案馆哈勃太空望远镜/ACS数据来构建详细描述灰尘模式的颜色图，并将这些数据与欧洲南部天文台VLT的数据构建的地图进行比较。十二个以宽场模式的缪斯指点形成了中央3.3'x2.4'的马赛克。我们使用工具pyparadise适合恒星人口。我们使用剩余发射线和残留的星际吸收NAI D线，并测量线强度，速度场和速度分散场。发射线类似于衬里线，[NII]到处都是最强的线。电离源可能是老年或中年恒星种群的临时巨型分支星星。尘埃结构，离子气体和原子气体分布之间存在惊人的匹配，其中最后一个是由恒星Nai D线的星际吸收残差表现出来的。在无尘区域中，星际NAI D线出现在发射中，这表明银河风。离子气体的速度场（以及灰尘）的特征是小规模的湍流运动，表明寿命很短。在中心，观察到离子气体的双极速度场，我们将其解释为流出。我们沿NGC1316的主要轴确定了强烈的气态尘土飞扬的圆盘。从中心散发出约4 kpc的电离气体的直光束。我们的发现强烈暗示了尘土飞扬的流出。核外流可能是星系中重要的灰尘生产机器。 （简略）
The early-type galaxy NGC 1316 hosts about 10^7 solar masses of dust within a central radius of 5 kpc. These prominent dust structures are believed to have an external origin, which is also a popular interpretation for other dusty early-type galaxies. We use archival Hubble Space Telescope/ACS data to construct colour maps that delineate the dust pattern in detail, and we compare these data with maps constructed with data from MUSE of the VLT at the European Southern Observatory. Twelve MUSE pointings in wide field mode form a mosaic of the central 3.3'x2.4'. We use the tool PyParadise to fit the stellar population. We use the residual emission lines and the residual interstellar absorption NaI D-lines, and we measure line strengths, the velocity field, and the velocity dispersion field. The emission lines resemble LINER lines, with [NII] being the strongest line everywhere. Ionising sources are plausibly the post-asymptotic giant branch stars of the old or intermediate-age stellar population. There is a striking match between the dust structures, ionised gas, and atomic gas distributions, the last of which is manifested by interstellar absorption residuals of the stellar NaI D-lines. In the dust-free regions, the interstellar NaI D-lines appear in emission, which is indicative of a galactic wind. The velocity field of the ionised gas (and thus of the dust) is characterised by small-scale turbulent movements that indicate short lifetimes. At the very centre, a bipolar velocity field of the ionised gas is observed, which we interpret as an outflow. We identify a strongly inclined gaseous dusty disc along the major axis of NGC1316. A straight beam of ionised gas with a length of about 4 kpc emanates from the centre. Our findings are strongly suggestive of a dusty outflow. Nuclear outflows may be important dust-producing machines in galaxies. (Abridged)
