Dust Attenuation in Late-Type Galaxies. I. Effects on Bulge and Disk Components
Dust Attenuation in Late-Type Galaxies. I. Effects on Bulge and Disk Components
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DOI：
10.1086/425651
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
D. Pierini;K. Gordon;A. Witt;G. J. M. Mpe;Garching;Germany;S. Observatory;Tucson;Az;
中科院分区：
文献类型：
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作者：
D. Pierini;K. Gordon;A. Witt;G. J. M. Mpe;Garching;Germany;S. Observatory;Tucson;Az;
我们提出了新的Monte Carlo计算的结果与DIRTY代码的恒星和散射辐射的辐射传输的尘埃巨大的晚型星系，如银河系，这说明了由内部尘埃的恒星光的衰减的效果上的综合测光的个别凸起和磁盘组件。在这里，我们专注于衰减函数的行为，颜色过剩，散射或直接向外部观察者传输的光的分数作为尘埃总量和星系倾角的函数，以及尘埃星际介质（ISM）的磁盘的结构。我们确认，尘埃衰减产生定性和定量不同的影响，无论波长的整体光度的凸起和磁盘。此外，我们发现尘埃ISM的结构比观测到的球和盘的颜色更敏感地影响观测到的星等。最后，我们表明，由外部观察者接收到的总单色光的散射辐射的贡献是显着的，特别是在UV波长，即使是两相，cloudly，尘土飞扬的ISM。因此，了解尘埃散射特性是解释河外观测的基础。
We present results of new Monte Carlo calculations made with the DIRTY code of radiative transfer of stellar and scattered radiation for a dusty giant late-type galaxy like the Milky Way, which illustrate the effect of the attenuation of stellar light by internal dust on the integrated photometry of the individual bulge and disk components. Here we focus on the behavior of the attenuation function, the color excess, and the fraction of light scattered or directly transmitted toward the outside observer as a function of the total amount of dust and the inclination of the galaxy, and the structure of the dusty interstellar medium (ISM) of the disk. We confirm that dust attenuation produces qualitatively and quantitatively different effects on the integrated photometry of bulge and disk, whatever the wavelength. In addition, we find that the structure of the dusty ISM affects more sensitively the observed magnitudes than the observed colors of both bulge and disk. Finally, we show that the contribution of the scattered radiation to the total monochromatic light received by the outside observer is significant, particularly at UV wavelengths, even for a two-phase, clumpy, dusty ISM. Thus, understanding dust scattering properties is fundamental for the interpretation of extragalactic observations in the rest-frame UV.