Distribution of Dust around Galaxies: An Analytic Model
Distribution of Dust around Galaxies: An Analytic Model
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星系周围尘埃的分布：解析模型
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
N. Yoshida
中科院分区：
文献类型：
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作者：
Shogo Masaki;N. Yoshida
我们发展了一个分析星系周围尘埃分布的晕模型。将模型结果与梅纳尔等人报道的Sloan数字巡天（SDSS）中通过背景类星体红化测量的表面尘埃密度剖面进行了比较。我们假设星系周围的尘埃分布与质量分布类似，但在αRvir处有一个尖锐的截止点，其中Rvir是星系的维里半径，α是模型参数。我们的模型在10-104 h−1 kpc的径向距离范围内很好地再现了观测到的尘埃分布轮廓。对于SDSS星系的特征星系晕质量估计为2 × 1012 h−1 M，如果α大于1，则获得最佳拟合模型，这表明尘埃分布在星系的几百千秒差距以上。如果我们假设尘埃的总量等于从宇宙时间内的恒星演化积分估计的尘埃总量，则再现了观测到的大尺度尘埃分布轮廓。
We develop an analytic halo model for the distribution of dust around galaxies. The model results are compared with the observed surface dust density profile measured through reddening of background quasars in the Sloan Digital Sky Survey (SDSS) reported by Menard et al. We assume that the dust distribution around a galaxy is described by a simple power law, similar to the mass distribution, but with a sharp cut-off at αRvir, where Rvir is the galaxy’s virial radius and α is a model parameter. Our model reproduces the observed dust distribution profile very well over a wide range of radial distance of 10–104 h−1 kpc. For the characteristic galaxy halo mass of 2 × 1012 h−1 M⊙ estimated for the SDSS galaxies, the best-fitting model is obtained if α is greater than unity, which suggests that dust is distributed to over a few hundred kiloparsecs from the galaxies. The observed large-scale dust distribution profile is reproduced if we assume the total amount of dust is equal to that estimated from the integrated stellar evolution over the cosmic time.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.