Table 5: Mass and H2 column- and volume-density estimates from lines. Molecular abundances relative to $\rm H_2$ have been assumed equal to 1.2 $\times $ 10-7, 3.4 $\times $10-8 and $2 \times 10^{-9}$ for C18O, C17O and CH3C2H, respectively. $N_{\rm H_2}$ and $\Delta v_{1/2}$ are the $\rm H_2$ column density and the FWHM of the lines, respectively.
Tracer $\theta _{\rm s}$ D $N_{\rm H_2}$ $\Delta v_{1/2}$ $M_{\rm VIR}$ $M_{\rm line}$ $n_{\rm H_{2}}$
  ( $^{\prime \prime }$ ) (pc) (cm-2 ) (km s-1 ) ($M_\odot$) ($M_\odot$) (cm-3 )
C17O (2-1) (PdBI) 1.3 0.03 5.4 $\times $ 1024 2.9 30 42 6.0 $\times $ 107
CH3C2H (13-12) (PdBI) 1.4 0.033 3.3 $\times $ 1024 3.0 32 15 1.7 $\times $ 107
C18O (1-0) (PdBI) 1.9 0.045 4.3 $\times $ 1024 3.4 55 69 3.2 $\times $ 107
HCO+(1-0)( $^{\dagger}$) 7 0.16 1.66 $\times $ 1024 3.3 200 370 3.4 $\times $ 106
C17O (2-1) (30 m) 15 0.35 1.1 $\times $ 1023 2.9 314 110 1.0 $\times $ 105
C18O (1-0) (30 m) 18 0.43 1.0 $\times $ 1023 2.4 259 200 1.1 $\times $ 105

( $^{\dagger}$) From Molinari et al. (2002).


Source LaTeX | All tables | In the text