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SEST/SIMBA – The ATCA’s Finder Telescope

SEST/SIMBA – The ATCA’s Finder Telescope. Tracey Hill University of NSW. SEST. 15m diameter radio telescope. Operates in freq range: 80- 365 GHz. Currently the only large sub-mm telescope in the Sthn Hemisphere. Fixed secondary mirror. SIMBA. 37- channel hexagonal bolometer array.

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SEST/SIMBA – The ATCA’s Finder Telescope

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  1. SEST/SIMBA– The ATCA’s Finder Telescope Tracey Hill University of NSW

  2. SEST • 15m diameter radio telescope. • Operates in freq range: 80- 365 GHz. • Currently the only large sub-mm telescope in the Sthn Hemisphere. • Fixed secondary mirror.

  3. SIMBA • 37- channel hexagonal bolometer array. • Central frequency of bandpass = 250 GHz (1.2mm). • The HPBW of a single element is ~ 23", separation between elements on the sky is 44". • Receiver operating temperature: 0.3K. • Cooled with liquid Helium and Nitrogen. • Range of scan speeds and map sizes. • On-the-fly mapping (chopping done in electronics).

  4. Observing with SEST/SIMBA • On-the-fly mapping. • Scanning speed: 8’’ per second. • Map size: 480’’ x 240’’. • Mapped each source for 4 minutes each. • Mapped each source 3 times. • Data reduction produces individual images, which you can coadd together. • Noise level of 90mJy (after 3 maps). • Observed 120 maps - most have >2 sources.

  5. G291.27-0.70 • Flux: 68.7Jy, Mass: ~15, 300M

  6. G18.30-0.39 Flux: 5.6Jy, Mass: ~850M

  7. G5.89-0.39 • Flux: 39.8Jy, Mass: ~ 4, 900M

  8. SEST + ATCA • Using UCHII and CH3OH maser surveys, we can detect star forming regions with SEST. • Determining the masses of the objects allows us to infer the presence of multiple cores in our detection. • Using ATCA we can resolve single sources into multiple cores.

  9. Potential Results with ATCA • ATCA provides high resolution imaging of the source. • At 3mm, the protostellar core is cold and optically thin –thus we can probe the inner parts of the star forming complex. • Multiwavelength data gives the S.E.D. • S.E.D gives the age of the star forming complex. • Age allows prediction of evolutionary scenario for massive star formation.

  10. Summary: • Survey of UC HII and CH3OH masers produced many multiple, massive cores when observed with SEST. • ATCA can be used to resolve these cores into individual components.

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