Table 3: SiO emission in external galaxies. Column 2: SiO abundance averaged within $28\hbox {$^{\prime \prime }$ }$ (from observations with the IRAM 30 m telescope); the averaging scale is ${\sim }0.5$ kpc, for NGC 253, IC 342 and M 82, and ${\sim }2$ kpc for NGC 1068; Col. 3: components resolved with the PdBI contributing to the global SiO emission; Col. 4: SiO abundance in the resolved components; Col. 5: mechanism proposed to be enhancing the SiO abundance; underlying physical process, in brackets (DW stands for "density waves''); Col. 6: references: a: García-Burillo et al. (2000); b: this work; c: García-Burillo et al. (2001b); d: Usero et al. (2004); e: Martín-Pintado et al. (2005, in prep.).
(1) (2) (3) (4) (5) (6)
Galaxy $\langle X\mathrm{(SiO)}\rangle_\mathrm{30\,m}$ Resolved components X(SiO) SiO Chemistry Ref.
  (10-10)   (10-10)    
NGC 253 1-3       a, e
    $r\sim60$ pc inner ring 1-2 shocks [YSOs / DW]  
    $r\sim300$ pc outer ring 5-15 shocks [DW]  
IC 342 3-7       b, e
    $r\sim50$ pc ring 2-7 shocks [DW]  
    150 pc length arm 10-40 shocks [DW]  
M 82 0.5       c, e
    $r\sim75$ pc shell 0.4-1 shocks [galactic outflow]  
    500 pc length chimney 2-3.5 shocks [galactic outflow]  
NGC 1068 7       d, e
    $r\sim1{-}1.5$ kpc ring $\sim$a few shocks [YSOs / DW]  
    $r\sim200$ pc disk $\sim$50 XDR [AGN] / shocks [DW]  


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