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Table 7:

Kennicutt-Schmidt law in M 31 for $30\hbox {$^\prime $ }<R<50\hbox {$^\prime $ }$.

$\Sigma$($M_{\odot }$ pc-2)
         $a_{\rm c}$        b n        $r_{\rm c}$ t
$\Sigma _{\rm 2H_2}$ -0.15 $\pm$ 0.01 0.96 $\pm$ 0.03 537 0.45 $\pm$ 0.04 12
$\Sigma _{\rm HI}$ -1.08 $\pm$ 0.03 1.40 $\pm$ 0.05 670 0.55 $\pm$ 0.03 17
$\Sigma _{\rm GAS}$ -1.12 $\pm$ 0.03 1.30 $\pm$ 0.05 668 0.59 $\pm$ 0.03 19

Notes. Ordinary-least squares fits of the bisector log ( $\Sigma _{\rm SFR}$) =  $a_{\rm c}+b$ log ($\Sigma$), where $\Sigma _{\rm SFR}$ is the face-on surface density of the star formation rate in $M_{\odot }$ Gyr-1 pc-2 and $\Sigma$ the face-on value of the gas surface density in $M_{\odot }$ pc-2; n is the number of independent points; $r_{\rm c}$ is the correlation coefficient and t the student-t test.

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