3mm Band GBT Spectroscopy

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3mm Band GBT Spectroscopy

• Al Wootten

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GBT Advantages

• Large aperture
• 67-94 GHz beam 8
• Sensitivity
• Large focal plane
• Flexible spectrometer
• Wide bandwidth
• Multiple IFs

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Disadvantages

• Sloppy beam
• If ?20, only qualitative science possible
• Better if sidelobes equally spread over sky
• If ?40, quantitative science possible
• Effect on baselines?
• Site
• But most 3mm spectroscopy has been done from
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