1. The Molecular Complexity of G34.3+0.2
Douglas N. Friedel
University of Illinois

2. Motivation
Previous studies of Orion-KL found that many of the complex molecules have both common and distinct regions.
Is this unique to Orion-KL (and other “chemically differentiated” regions), or is this a common feature of high mass star forming regions?

3. Observations
CARMA array in D, C, and B configurations (5”, 3”, 1” resolutions)
Selected transitions in 3mm band
96+ transitions for 16 molecular species all observed in 1 pass
Presenting results from ethyl cyanide, methyl formate, formamide,
acetone
Source: G

4. G34.3+0.2 Ethyl Cyanide C2H5CN Dimethyl Ether (CH3)2O Acetone (CH3)2CO
Distance = 3.8 kpc
1 arcsec = 3800 AU

5. Ethyl Cyanide (C2H5CN)
Most flux is from larger scale structures

6. Ethyl Cyanide (C2H5CN) Bulk of emission from core region
Some notable emission to SSE
Velocity peaks show rather compact overall emission

7. Methyl Formate (HCOOCH3)
Most emission from extended regions

8. Methyl Formate (HCOOCH3)
Bulk of emission outside of core
Some notable emission to SSE
Velocity peaks show much more extended distribution overall

9. Acetone [(CH3)2CO]
Notable large scale scale emission
Peak is more to the north of core

10. Acetone [(CH3)2CO]
Bulk of emission near edge of core
Some emission to SE
Velocity peaks show very compact emission in general

11. Formic Acid (HCOOH)
Weakly detected, and only with largest beam

12. Formic Acid (HCOOH)
All emission near core
Velocity peaks show very compact emission in general

13. Formamide (NH2CHO)
Strong, somewhat extended emission
Directly on top of core

14. Formamide (NH2CHO)
All emission near core
Velocity peaks show compact emission in general

15. Thioformaldehyde (H2CS)
Strong enough in compact emission to show some velocity
detail of SSW core

16. Comparing the bulk emission:
Much of the large scale emission is coincident
Peaks are offset
SW peaks also offset
Acetone
Methyl Formate
Ethyl Cyanide

17. Comparison of velocity peaks
Acetone
Methyl Formate
Ethyl Cyanide
Formic Acid
Formamide

18. Summary Orion-KL is not unique but is typicalG
Orion-KL is not unique but is typical
Every source observed to date has non-cospatial peak emission from our tracer molecules (separated by at least 1000 AU)
Overall emission had notable overlaps but unique distributions
W51
W75N W3

19. Acknowledgments
Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, and by the CARMA partner universities.
References
Widicus Weaver, S. L., & Friedel, D.N. 2012, ApJS, 201, 16