千年星系目录：尘埃螺旋盘对核球通量的严重衰减
The Millennium Galaxy Catalogue: The severe attenuation of bulge flux by dusty spiral discs
摘要：
使用千年星系目录，我们量化的光盘和星系倾角的隆起光度函数的依赖性。使用当代尘埃模型，我们表明，我们的结果是一致的星系盘在其中心区域的光学厚度（tau_B^f=3.8+/-0.7）。因此，所测量的B波段流量的凸起可以严重衰减50%至95%，这取决于光盘倾斜。我们认为，一个星系的光学外观可以从根本上改变，通过简单地去除尘埃，例如在集群的下降，与中型星系变得更早，更红，更明亮。最后，我们从0.1微米到2.1微米的范围内的综合星系人口得出的平均光子逃逸分数，并使用此来表明，在我们的模型中，尘埃吸收的星光的能量与总的远红外辐射是密切一致的。
英文摘要：
Using the Millennium Galaxy Catalogue we quantify the dependency of the disc and bulge luminosity functions on galaxy inclination. Using a contemporary dust model we show that our results are consistent with galaxy discs being optically thick in their central regions (tau_B^f=3.8+/-0.7). As a consequence the measured B-band fluxes of bulges can be severely attenuated by 50% to 95% depending on disc inclination. We argue that a galaxy's optical appearance can be radically transformed by simply removing the dust, e.g. during cluster infall, with mid-type galaxies becoming earlier, redder, and more luminous. Finally we derive the mean photon escape fraction from the integrated galaxy population over the 0.1micron to 2.1 micron range, and use this to show that the energy of starlight absorbed by dust (in our model) is in close agreement with the total far-IR emission.
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