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arXiv 1402.0345astro-ph.GAastro-ph.CO
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Seyfert星系观测光谱能量分布对星团性质的敏感性研究

Investigating the sensitivity of observed spectral energy distributions to clumpy torus properties in Seyfert galaxies

C. Ramos Almeida, A. Alonso-Herrero, N. A. Levenson, A. Asensio Ramos, J. M. Rodriguez Espinosa, O. Gonzalez-Martin, C. Packham, M. Martinez

摘要:

我们目前的核光谱能量分布(SED)从1到18微米的一个小样本附近,几乎面对和未受干扰的塞弗特星系没有突出的核尘埃带。这些核SED探测星系的平均中心约35 pc,包括光度和光谱红外(IR)数据。我们使用这些SED,cluaptorus模型Nenkova等人。和贝叶斯方法来研究不同的红外波长的环面参数的敏感性。我们发现,高角分辨率8-13微米的光谱学单独可靠地约束的团块的数量和它们的光学深度(N 0和τ_V)。另一方面,我们需要结合中红外和近红外亚弧秒分辨率测光来约束环面宽度和倾斜度,以及云的径向分布(sigma,i和q)。对于平坦的径向轮廓(q= 0,1),除了近红外测光外,当N波段光谱可用时,可以将中红外辐射尘埃的范围限制在环面(Y)内。最后,通过拟合不同的组合的平均和个人的Seyfert 1和Seyfert 2的数据,我们发现,在一般情况下,未受干扰的,几乎面对没有突出的核尘埃带的Seyfert,可靠地约束所有的环面参数所需的最小数据组合是J+K+ M-波段测光+N-波段光谱。

英文摘要:

We present nuclear spectral energy distributions (SEDs) from 1 to 18 micron of a small sample of nearby, nearly face-on and undisturbed Seyfert galaxies without prominent nuclear dust lanes. These nuclear SEDs probe the central ~35 pc of the galaxies, on average, and include photometric and spectroscopic infrared (IR) data. We use these SEDs, the clumpy torus models of Nenkova et al. and a Bayesian approach to study the sensitivity of different IR wavelengths to the torus parameters. We find that high angular resolution 8-13 micron spectroscopy alone reliably constrains the number of clumps and their optical depth (N0 and tau_V). On the other hand, we need a combination of mid- and near-IR subarcsecond resolution photometry to constrain torus width and inclination, as well as the radial distribution of the clouds (sigma, i and q). For flat radial profiles (q=0,1), it is possible to constrain the extent of the mid-IR-emitting dust within the torus (Y) when N-band spectroscopy is available, in addition to near-IR photometry. Finally, by fitting different combinations of average and individual Seyfert 1 and Seyfert 2 data, we find that, in general, for undisturbed, nearly face-on Seyferts without prominent nuclear dust lanes, the minimum combination of data necessary to reliably constrain all the torus parameters is J+K+M-band photometry + N-band spectroscopy.

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