论文标题
星系之间的放牧碰撞中的外臂starburst流出
Outflow from Outer-arm Starburst in a Grazing Collision between Galaxies
论文作者
论文摘要
新的Alma CO，HCO+和100 GHz连续观测和Gemini Nifs K频段光谱与先前的无线电与X射线数据结合使用，以研究功能I，这是一个高度发光的星状螺旋杆，在相互作用的Galaxy NGC 2207的外臂上。该团块具有光优化的粉尘锥体，其170 pc corece core core core corece core corece core core corece core corece core core core core core core corece core core core core core core corece core。如果几乎所有的气体和灰尘都位于星形簇的前面，则测量的CO占黑锥灭绝。相关的接近CO流出的V_z〜16 km/s，估计的分子质量8 x 10^6 msun，并上升到高度〜0.9 kpc。 V_z〜28 km/s的远端的后流co流出不那么广泛。在10 MYR上观察到的恒星形成可以通过超新星和恒星风提供深色锥动能。激烈活动的其他迹象是可变的无线电连续体，表明嵌入式超新星或其他爆发，X射线发射和BR-gamma，并具有82 km/s线的宽度。根据先前的模型，NGC 2207遭受的逆行遭遇导致角动量丧失。这压缩了其外盘。我们建议，由于螺旋密度波压缩并触发了观察到的starburst，因此所得内的崩溃气流撞到了巨大的HI云。
New ALMA CO, HCO+, and 100 GHz continuum observations and Gemini NIFS K-band spectra are combined with previous radio to X-ray data to study Feature i, a highly luminous starburst clump on an outer arm of the interacting galaxy NGC 2207. This clump has an optically-opaque dust cone extending out of its 170 pc core. The measured CO accounts for the dark cone extinction if almost all the gas and dust there is in front of the star clusters. An associated approaching CO outflow has v_z ~ 16 km/s, an estimated molecular mass 8 x 10^6 Msun, and rises to heights ~ 0.9 kpc. A receding CO outflow on the far side with v_z ~ 28 km/s is less extensive. The observed star formation in the core over 10 Myr can supply the dark cone kinetic energy via supernovae and stellar winds. Other signs of intense activity are variable radio continuum suggesting an embedded supernova or other outburst, X-ray emission, and Br-gamma and He I lines with 82 km/s line widths. According to previous models, the retrograde encounter suffered by NGC 2207 caused loss of angular momentum. This compressed its outer disk. We suggest that the resulting inward crashing gas stream hit a massive HI cloud as it was being compressed by a spiral density wave and triggered the observed starburst.
