1. The SMA submm view of Orion-KL
Henrik Beuther
860 and 440mm continuum emission
Thermal line emission in the 345 and 690GHz bands
(345GHz: ApJL, 616, L31 & ApJ submitted; 690GHz: work in progress)
In collaboration with: Q. Zhang, M. Reid, D. Wilner, E. Keto, T. Hunter, H. Shinnaga, P. Ho,
J. Moran, M. Gurwell, D. Marrone. R. Rao, L. Humphreys, N. Patel, G. Melnick (all CfA)
S.-Y. Liu, C.-M. Chang (both ASIAA)

2. Spectra at 338 and 348GHz Approximately 150 spectral lines
from 26 species
90% of them could be identified
Additional low-level emission
which needs further work
15% of the lines were not detected
by previous single-dish studies (plus
low-level emission)

3. 860mm Submillimeter Continuum

4. 860 and 440mm Submm Continuum emission
690GHz observations:
UV-coverage not great and calibrator Titan
about 40o away ---> imaging difficult!
- 2 point sources likely correspond to
source I and SMA1
- The SED of I well fits “free-free+dust”
- Spectral index of SMA1 S~n3.2

5. Spectral line emission
Toward source I mainly SiO
Sulphur-bearing species toward
Hot Core and Compact Ridge
Sulphur- and oxygen-bearing
species toward IRc6
Imaging helps to identify lines
Oxygen-bearing molecules
weaker toward Hot Core and
strong toward Compact Ridge
Nitrogen-bearing molecules
strong toward Hot Core

6. Rotation temperatures from CH3OH

7. Orion-KL: 690 GHz spectra

8. Line images
Source I
SMA1

9. Summary Derive physical properties from source I
Identify a new protostellar source SMA1
Imaging the spatial structure of many molecular lines in
various submm wavelength bands
Temperature structure of the whole region
- Using the image capabilities to identify lines