1. High Resolution Observations of Orion-KL: Insight into its Chemical Complexity D. N. Friedel S. L. Widicus Weaver

2. Liu et al., 2002, ApJ, 576, 255 Traditional view: Complex N and O bearing species are spatially separated N bearing species originate in hot/dense region O bearing species originate in diffuse region O species are created first followed by N species Background seds.lpl.arizona.edu/messier/Pics/Jpg/ori_kc.jpg

3. Observations CARMA Array B configuration1.0''x0.9'' beam D configuration5.0''x4.0'' beam MoleculeTransition (GHz) E u (K) S 2 C 2 H 5 CN10 2,9 -9 2,8 89.29728119.3 HCOOCH 3 8 1,8 -7 1,7 A89.3142021.0 8 1,8 -7 1,7 E89.3162021.0 (CH 3 ) 2 O15 2,13 -15 1,14 88.707 1 11711.6 (CH 3 ) 2 CO9 *,8 -8 *,7 101.427 1 277.2 9 *,9 -8 *,8 92.735 1 248.4 SO 2 7 3,5 -8 2,6 97.702482.5 HCOOH4 1,4 -3 1,3 86.546147.3 4 1,3 -3 1,2 93.098147.3 1 Frequency is for strongest torsional state

4. 3 mm Continuum Grayscale is NICMOS 2mm continuum Contours are 3mm continuum Sources of interest are labeled

5. Methyl Formate [HCOOCH 3 ] 1 velocity component Multiple emission components Double lobed feature near star k

6. Ethyl Cyanide [C 2 H 5 CN] Three main velocity components: Typical Hot Core velocity (3-5 km s -1 ) Strongest emission Blue shifted component Compact, associated with star n Red shifted component Near IRc sources dominated by O bearing species

7. Formic Acid [HCOOH] Original detection was with 5''x8'' beam Undetected in B array observations 2 velocity components Typical CR velocity Typical HC velocity Distinct O bearing regions HCOOH only extended HCOOH not co-spatial with other O species

8. SO 2

9. Acetone [(CH 3 ) 2 CO] Only peaks where O and N species are co-spatial

10. Summary Region is very complex O and N species differentiated into multiple regions Overlap regions contain acetone Traditional view is not correct Majority of O bearing molecules are in compact regions Only formic acid has purely extended component Much emission from regions where there is no detected continuum Specifically star n