银河系消光

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The Galactic extinction in the u band A_u based on the maps of Schlegel et al. (1998, ApJ, 500, 525). For an R_V = 3.1 absorbing medium, the extinctions in the SDSS bands can be expressed as A_x = C_x E(B-V), where x is the filter (ugriz).

values of C_x are 5.155, 3.793, 2.751, 2.086, and 1.479 for ugriz, respectively
A_g, A_r, A_i, and A_z are 0.736, 0.534, 0.405, and 0.287 times A_u.
  • IDL中的计算程序

idlutils中的dust_sdssfilter

aval = dust_sdssfilter(dust_getval(l, b, map='IX', /interp), source='Galaxy')

文献

  • arXiv1607.08623
利用造父变星,RR Lyre变星的红外的颜色-颜色图来测量消光系数(变星的光变主要是由于恒星的半径变化引起的,因此内禀的颜色应该不变尤其在近红外波段)
在近红外波段,并未发现消光系数随着银精和银心距有明显的变化(而利用O型星得到的在光学波段的效光系数有这种位置依赖性)