The Opacity of Spiral Galaxy Disks. VIII. Structure of the Cold ISM
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چکیده
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15 صفحه اولStructure and Evolution of the Opacity of Spiral Disks
The opacity of a spiral disk due to dust absorption influences every measurement we make of it in the UV and optical. Two separate techniques directly measure the total absorption by dust in the disk: calibrated distant galaxy counts and overlapping galaxy pairs. The main results from both so far are a semi-transparent disk with more opaque arms, and a relation between surface brightness and di...
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The “Synthetic Field Method” (SFM) was introduced by González et al. (1998) to calibrate numbers of distant galaxies as a probe of extinction in a foreground spiral disk. González et al. (2003) studied the effect of the foreground disk on these numbers using simulations of current and future instruments for fields in the LMC, M31 and NGC 4536, a galaxy in Virgo. They concluded that: (1) the bri...
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The opacity of spiral galaxy disks, from counts of distant galaxies, is compared to HI column densities. The opacity measurements are calibrated using the “Synthetic Field Method” from González et al. (1998); Holwerda et al. (2005a). When compared for individual disks, the HI column density and dust opacity do not seem to be correlated as HI and opacity follow different radial profiles. To impr...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2007
ISSN: 0004-6256,1538-3881
DOI: 10.1086/522230