Monitoring of CO emission at 230 GHz from IRAM 30-m

Following our detection of CO at impact site G and probably H on July 18, we have continued to monitor the CO 230 GHz emission. Re-examination of our observations of July 17 also reveals that this line was present at impact site E and marginally at impact site C. The following table summarizes the line area for several impact sites and dates. In brackets is the approximate age of the impact sites. "marginal" indicates a marginal detection from which no reliable estimate of the area can be derived.

 Impact \Date       July 17               July 18		July 19
 site        	(UT around 19.00 in each case)



  C             marginal                    -                    -
		(age= 12 h)  

  E              0.6 K km/s                 -              marginal
		(age=4h)                                   (age=52 h)

  G                -                     1.5 K km/s        1.6 K km/s
					 (age = 12h)       (age=36h)

  H             marginal                  0.35 K km/s       1 K km/s
					  (age = 2 h)      (age= 26 h)

The width (FWHM) of the clearly detected lines is constant at 2-3 km/s.

Finally, we have also searched unsuccesfully for CO+ and H2S.

E. Lellouch, M. Festou, G. Paubert