Spectral Energy Distributions of Dusty Galaxies
Spectral Energy Distributions of Dusty Galaxies
复制标题
尘埃星系的光谱能量分布
DOI：
10.1093/pasj/55.2.385
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发表时间：
2000
影响因子：
2.3
通讯作者：
N. Arimoto
中科院分区：
文献类型：
--
作者：
T. Takagi;V. Vansevičius;N. Arimoto
本文提出了一个尘埃星系的SED模型，其中辐射传输方程是在球对称假设下求解的。极小尘埃粒子的温度起伏与辐射传输的计算结果一致。所采用的灰尘模型由石墨和硅酸盐颗粒和多环芳烃，其相对分数确定为每个MW，LMC和SMC型消光曲线。这个模型使我们能够得到嵌入在尘埃ISM，这是非常重要的指标，恒星人口的年龄恒星人口的内在SED。因此，星暴星系的演化阶段，经常有非常多的灰尘ISM可以研究与此SED模型。我们发现Arp 220和M82的SED都可以用同一个恒星群体来解释，尽管SED和红外光度有显着差异。它们的SED之间的明显差异主要是由光学深度的差异引起的。相比之下，原型恒星形成ERO HR 10的SED表明，与Arp 220和M82相比，这个星系相对较老。结果发现，在光学薄极限的情况下，像椭圆星系，光学深度不能推断出只从SED，由于光学深度，星系的大小，和尘埃的空间分布之间的简并性;后两者是重要的估计尘埃颗粒的平均温度在椭圆星系。当椭圆星系的观测尺寸被用于模型几何时，SED可以用来约束椭圆星系中尘埃的空间分布。
We present a SED model of dusty galaxies, in which the equation of radiative transfer is solved by assuming spherical symmetry. The temperature fluctuation of very small dust particles is calculated consistently with the radiative transfer. The adopted dust model consists of graphite and silicate grains and PAHs, whose relative fractions are determined for each MW, LMC and SMC type extinction curve. This model allows us to derive the intrinsic SEDs of stellar populations embedded in dusty ISM, which are very important indicators for the age of stellar populations. Therefore, the evolutionary phase of starburst galaxies which have frequently very dusty ISM can be investigated with this SED model. We show that the SEDs of Arp220 and M82 can both be explained by the same single stellar population, despite the significant differences in the SEDs and the infrared luminosities. The apparent difference between their SEDs is mainly caused by the difference in the optical depth. In contrast, the SED of prototypical star-forming ERO, HR10, indicates that this galaxy is relatively old comparing to Arp220 and M82. It is found that, in the case of optically thin limit like elliptical galaxies, the optical depth cannot be inferred only from the SED, due to a degeneracy between the optical depth, galactic size, and the spatial distribution of dust; the latter two are important for estimating the average temperature of dust grains in elliptical galaxies. When the observed size of elliptical galaxies is adopted for the model geometry, SEDs can be used to constrain the spatial distribution of dust in elliptical galaxies.
DOI：
--
发表时间：
2004
期刊：
Astronomical Society of the Pacific Conference Series 309
影响因子：
--
作者：
Aikawa;Y.;Herbst;E.;Roberts;H.;Caselli P;T.Miyata;M.Mizutani;M.Honda;T.Onaka
通讯作者：
T.Onaka