Radiative transfer in disc galaxies - IV. The effects of dust attenuation on bulge and disc structural parameters

Radiative transfer in disc galaxies - IV. The effects of dust attenuation on bulge and disc structural parameters
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盘状星系中的辐射传输 - IV 尘埃衰减对核球和盘状结构参数的影响

DOI:
10.1111/j.1365-2966.2010.16243.x
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发表时间:
2010
影响因子:
4.8
通讯作者:
Falony
Falony
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gadotti;Falony

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结合Monte Carlo辐射传输模拟和精确的2D球/盘分解,我们提出了一个新的研究,调查尘埃衰减对螺旋星系盘和球的表观结构特性的影响。我们发现,灰尘影响的结果,从这种分解的方式,无法确定当一个单独研究灰尘的影响鼓包和光盘组件。特别是,尘埃在伪膨胀星系中的影响可能不同于那些在经典膨胀星系中的影响,即使它们的尘埃含量是相同的。重复以前的结果,我们发现,光盘scaleleplastics高估时,尘埃效应是重要的。此外,我们还发现,凸起的有效半径和Sérsic指数被低估。此外,集成光盘光的表观衰减被低估,而相应的凸起光的衰减被高估。尘埃的影响是更显着的隆起参数,并结合起来,他们导致了一个强烈的低估的隆起盘比,这可以达到一个因素2在theV波段,即使在相对较低的星系倾角和尘埃不透明度。然而,它从未达到大于约3的因子,这对应于膨胀与总比率的因子2。这种效应可能会对黑洞/核球标度关系的研究产生影响。
Combining Monte Carlo radiative transfer simulations and accurate 2D bulge/disc decompositions, we present a new study to investigate the effects of dust attenuation on the apparent structural properties of the disc and bulge of spiral galaxies. We find that dust affects the results from such decompositions in ways which cannot be identified when one studies dust effects on bulge and disc components separately. In particular, the effects of dust in galaxies hosting pseudo-bulges might be different from those in galaxies hosting classical bulges, even if their dust content is identical. Confirming previous results, we find that disc scalelengths are overestimated when dust effects are important. In addition, we also find that bulge effective radii and Sérsic indices are underestimated. Furthermore, the apparent attenuation of the integrated disc light is underestimated, whereas the corresponding attenuation of bulge light is overestimated. Dust effects are more significant for the bulge parameters, and, combined, they lead to a strong underestimation of the bulge-to-disc ratio, which can reach a factor of 2 in theVband, even at relatively low galaxy inclinations and dust opacities. Nevertheless, it never reaches factors larger than about 3, which corresponds to a factor of 2 in bulge-to-total ratio. Such effect can have an impact on studies of the black hole/bulge scaling relations.
空间 de Vaucoulurs 和 Sérsic 定律及相关量的精确解
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