论文标题
了解小星系中的恒星形成和反馈。蓝色紧凑型矮人MRK 900的情况
Understanding star formation and feedback in small galaxies. The case of the blue compact dwarf Mrk 900
论文作者
论文摘要
（删节的）低亮度，活跃的星形蓝色紧凑星系（BCG）是研究恒星在银河尺度上的恒星形成过程的极好实验室，并探测了大型恒星与周围星际星际（或galactacic）培养基之间的相互作用。我们研究了蓝色紧凑星系MRK 900的形态，结构和恒星含量，结合了在VLT处使用VIMOS获得的光学积分场观测值，并在2.5 m非望远镜下进行的2.5 m进行了深宽波段光度法。从积分字段数据中，我们构建了连续性，排放和诊断线比图，并产生了速度和速度分散图。我们还生成了主要HII区域和核区域的综合光谱，以确定可靠的物理参数和氧气丰度。宽带数据将银河系追溯到半径为4 kpc的数据，使我们能够研究恒星宿主下面的低表面亮度的性质。我们在MRK 900中解开了两个不同的恒星成分：一个年轻的人群，它们分解为单个恒星群，年龄〜5.5-6.6 MYR，沿着银河系后轴延伸约1 kpc，被放置在一个相当红色的红色和规则形状的下面的恒星恒星宿主的顶部。我们发现证据表明大量的灰尘和不均匀的灭绝模式，尘埃巷越过中央的星爆。 MRK 900显示了整体旋转，尽管在中央的Starburst地区扭曲；色散速度图高度不均匀，在SF区域的外围，值高达60 kms $^{ - 1} $，我们还发现了冲击的存在暗示。我们的观察结果表明，与低质量物体或无数气体作为合理的触发机制的相互作用或合并。
(Abridged) Low-luminosity, active star-forming blue compact galaxies (BCGs) are excellent laboratories for investigating the process of star formation on galactic scales and probing the interplay between massive stars and the surrounding interstellar (or intergalactic) medium. We investigated the morphology, structure, and stellar content of the Blue Compact Galaxy Mrk 900, combining optical integral field observations obtained with VIMOS at the VLT and deep broad-band photometry taken at the 2.5 m NOT telescope. From the integral field data, we built continuum, emission, and diagnostic line ratio maps and produced velocity and velocity dispersion maps. We also generated the integrated spectrum of the major HII regions and the nuclear area to determine reliable physical parameters and oxygen abundances. The broad-band data, tracing the galaxy up to radius 4 kpc, allowed us to investigate the properties of the low surface brightness underlying stellar host. We disentangle two different stellar components in Mrk 900: a young population, which resolves into individual stellar clusters with ages ~5.5-6.6 Myr and extends about 1 kpc along the galaxy minor axis, is placed on top of a rather red and regular shaped underlying stellar host, several Gyr old. We find evidence of a substantial amount of dust and an inhomogeneous extinction pattern, with a dust lane crossing the central starburst. Mrk 900 displays overall rotation, although distorted in the central, starburst regions; the dispersion velocity map is highly inhomogeneous, with values increasing up to 60 kms$^{-1}$ at the periphery of the SF regions, where we also find hints of the presence of shocks. Our observational results point to an interaction or merger with a low-mass object or infalling gas as plausible trigger mechanisms for the present starburst event.
