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

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Presentation on theme: "High Resolution Observations of Orion-KL: Insight into its Chemical Complexity D. N. Friedel S. L. Widicus Weaver."— Presentation transcript:

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, HCOOCH 3 8 1,8 -7 1,7 A ,8 -7 1,7 E (CH 3 ) 2 O15 2, , (CH 3 ) 2 CO9 *,8 -8 *, *,9 -8 *, SO 2 7 3,5 -8 2, HCOOH4 1,4 -3 1, ,3 -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


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