碰撞碎片作为研究恒星形成的实验室
Collisional debris as laboratories to study star formation
摘要：
在本文中，我们讨论了恒星形成是由局部过程还是大规模环境驱动的问题。要做到这一点，我们调查恒星形成碰撞碎片的引力势阱和速度梯度较浅，并比较我们的结果与以前的工作在非相互作用的螺旋星系和矮星系的恒星形成。我们已经进行了多波长光谱和成像观测（从远紫外到中红外）的6个相互作用的系统，确定了共60个恒星形成区域的碰撞碎片。我们的分析表明：（1）在这些区域，尘埃的辐射强度与其光度和金属丰度相当，（2）通常的恒星形成率示踪物显示出典型的经典恒星形成区的趋势和散射，（3）消光和金属丰度不是决定星系际恒星形成区性质散射的主要参数;年龄效应和恒星星族数量的变化似乎起着重要作用。我们的工作表明，局部性质，如柱密度和尘埃含量，而不是大尺度环境似乎驱动恒星形成。这意味着星系际恒星形成区可以作为研究恒星形成的可靠工具。
英文摘要：
In this paper we address the question whether star formation is driven by local processes or the large scale environment. To do so, we investigate star formation in collisional debris where the gravitational potential well and velocity gradients are shallower and compare our results with previous work on star formation in non-interacting spiral and dwarf galaxies. We have performed multiwavelength spectroscopic and imaging observations (from the far-ultraviolet to the mid-infrared) of 6 interacting systems, identifying a total of 60 star-forming regions in their collision debris. Our analysis indicates that in these regions a) the emission of the dust is at the expected level for their luminosity and metallicity, b) the usual tracers of star formation rate display the typical trend and scatter found in classical star forming regions, and c) the extinction and metallicity are not the main parameters governing the scatter in the properties of intergalactic star forming regions; age effects and variations in the number of stellar populations, seem to play an important role. Our work suggests that local properties such as column density and dust content, rather than the large scale environment seem to drive star formation. This means that intergalactic star forming regions can be used as a reliable tool to study star formation.
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