= M82 spectrum =

== Results ==
 .The spectrum map is defined by index = log(Map_140/Map_240)/alog(140.0/240.0). We can clearly see a change in the spectral index in the source. This is confirmed by the correlation plot which shows the values in the pixel of the 240 GHz map as a function of the value of the corresponding 140GHz map.

 || {{attachment:1mm_map_m82.png}} || {{attachment:2mm_map_m82.png}} || {{attachment:spectre.png}} ||
 || [[attachment:1mm_map_m82.pdf]] || [[attachment:2mm_map_m82.pdf]] || [[attachment:spectre.pdf]] ||

 || {{attachment:correlation.png||width=850,height=700}} ||
 || [[attachment:correlation.pdf]] ||


== Possible interpretation ==
 .The slopes of 0.6 and 1.25 correspond respectively to spectral index of +1 and -0.4. We might understand it if we consider that the contribution of the emission of M82 is due to dust and free-free. The center of M82 is therefore dominated by free-free emission and the outskirt is dominated by dust.