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Table 3:

Exponential scale lengths of dust and gas emissions from M 31.
  $l_{\rm N}$ (kpc) $l_{\rm S}$ (kpc) l (kpc)
IR 160 $\mu $m 1.86 $\pm$ 0.06 3.87 $\pm$ 0.18 2.29 $\pm$ 0.11
IR 70 $\mu $m 1.38 $\pm$ 0.08 3.07 $\pm$ 0.17 1.66 $\pm$ 0.09
IR 24 $\mu $m 1.38 $\pm$ 0.07 3.44 $\pm$ 0.21 1.57 $\pm$ 0.06
H2 1.14 $\pm$ 0.07 2.40 $\pm$ 0.22 1.27 $\pm$ 0.11
HI 4.54 $\pm$ 0.24 15.90 $\pm$ 1.70 5.90 $\pm$ 0.20
HI+2H2 3.80 $\pm$ 0.12 9.00 $\pm$ 0.69 4.73 $\pm$ 0.21
H$\alpha $ 1.08 $\pm$ 0.03 2.92 $\pm$ 0.10 1.39 $\pm$ 0.04
$\tau _{{\rm H}\alpha }$ 2.48 $\pm$ 0.07 5.06 $\pm$ 0.22 3.17 $\pm$ 0.15

Notes. The scale lengths were calculated from R = 10.9 kpc to R = 14.9 kpc for the whole galaxy (l) and the northern half ($l_{\rm N}$) and from R = 8.9 kpc to R = 14.9 kpc for the southern half ($l_{\rm S}$). The scale length of $\tau _{{\rm H}\alpha }$ is also shown for comparison.


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