Star formation history and dust content of galaxies drawn from ultraviolet surveys
Star formation history and dust content of galaxies drawn from ultraviolet surveys
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DOI：
10.1111/j.1365-2966.2004.07556.x
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发表时间：
2003-12
影响因子：
4.8
通讯作者：
Xu Kong;S. Charlot;J. Brinchmann;S. M. Fall
中科院分区：
文献类型：
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作者：
Xu Kong;S. Charlot;J. Brinchmann;S. M. Fall
我们编译了一个新的样本115附近，非塞弗特星系跨越了广泛的星星形成活动，从星爆到几乎休眠，根据紫外线观测与各种卫星。我们联合收割机红外观测，研究了远红外与紫外总光度比与紫外光谱斜率的关系（IRX-UV关系）。我们发现，在固定的紫外光谱斜率，在我们的样本中，静止的恒星形成星系有系统的总远红外线比紫外线光度比星暴星系。对星星形成历史敏感的光谱指数（如4000 A光谱不连续和Ha发射等效宽度）的强度与距IRX-UV图中星爆星系平均关系的距离有很好的相关性，而对尘埃敏感的Hα/Hβ比值与该距离几乎没有相关性。这是强有力的观测证据，表明星星的形成历史与影响IRX-UV关系的第二个参数有关。我们表明，这些结果可以理解的框架内的简单模型的Charlot和秋天的星光传输通过星际介质中的星系。我们确认，对于星暴星系，紧密的IRX-UV关系可以理解为最简单的整体尘埃含量的序列。此外，我们发现，扩大的关系，静止的恒星形成星系可以理解为最简单的序列中的比率，现在过去的平均星星形成率。我们使用一个图书馆的Monte Carlo实现不同的星星形成的历史和尘埃含量的星系量化的准确性，紫外线衰减A FUV的一个星系可以估计从远红外线到紫外线光度或紫外线光谱斜率的比率。我们提供了简单的公式来估计一个FUV作为这些观测量的函数，并表明，这些估计的准确性可以显着提高，如果有一些约束条件的比例，现在过去的平均星星形成率。
We compile a new sample of 115 nearby, non-Seyfert galaxies spanning a wide range of star formation activities, from starburst to nearly dormant, based on ultraviolet observations with various satellites. We combine these observations with infrared observations to study the relation between ratio of total far-infrared to ultraviolet luminosity and ultraviolet spectral slope (the IRX-UV relation). We show that, at fixed ultraviolet spectral slope, quiescent star-forming galaxies in our sample have systematically lower ratio of total far-infrared to ultraviolet luminosity than starburst galaxies. The strengths of spectral indices sensitive to star formation history, such as the 4000-A spectral discontinuity and the Ha emission equivalent width, correlate well with distance from the mean relation for starburst galaxies in the IRX-UV diagram, while there is little or no correlation between the dust-sensitive Hα/Hβ ratio and this distance. This is strong observational evidence that the star formation history is relevant to the second parameter affecting the IRX-UV relation. We show that these results can be understood in the framework of the simple model of Charlot & Fall for the transfer of starlight through the interstellar medium in galaxies. We confirm that, for starburst galaxies, the tight IRX-UV relation can be understood most simply as a sequence in overall dust content. In addition, we find that the broadening of the relation for quiescent star-forming galaxies can be understood most simply as a sequence in the ratio of present to past-averaged star formation rate. We use a library of Monte Carlo realizations of galaxies with different star formation histories and dust contents to quantify the accuracy to which the ultraviolet attenuation A FUV of a galaxy can be estimated from either the ratio of far-infrared to ultraviolet luminosity or the ultraviolet spectral slope. We provide simple formulae for estimating A FUV as a function of either of these observational quantities and show that the accuracy of these estimates can be significantly improved if some constraints are available on the ratio of present to past-averaged star formation rate.