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Molecular Line Surveys

Molecular Line Surveys. Robert Minchin. Spectral Survey Concentrate on small number of sources. Covers many frequencies. Can discover many new lines. Multi-object Survey Concentrate on single band. Many sources observed. Can discover targetted lines in new sources. Two kinds of survey:.

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Molecular Line Surveys

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  1. Molecular Line Surveys Robert Minchin

  2. Spectral Survey Concentrate on small number of sources. Covers many frequencies. Can discover many new lines. Multi-object Survey Concentrate on single band. Many sources observed. Can discover targetted lines in new sources. Two kinds of survey:

  3. Arp 220: Spectral Survey • Survey covers 1 - 10 GHz. • Spectrum split into 14 sections of 670 MHz each for observing. • Each section observed for 1 hour on-source. • Survey 98% complete. • Initial results: Salter et al. 2008.

  4. Prebiotic Molecules: Multi-object Survey • Targets 21 “Arp 220-like” galaxies. • Covers 4450 - 5300 MHz, including the methanimine and HCN transitions. • Methanimine found in a further 4 galaxies so far and HCN in 3.

  5. Prebiotic Molecules: Multi-object Survey • Targets 21 “Arp 220-like” galaxies. • Covers 4450 - 5300 MHz, including the methanimine and HCN transitions. • Methanimine found in a further 4 galaxies so far and HCN in 3. • Observations and analysis are ongoing. • 19 galaxies outside of the Arecibo sky being observed with the GBT

  6. Future Capabilities I • Expand instantaneous spectral coverage to 1 GHz. • Uses current IF and the new Mock Spectrometers. • Proposals already received (Arce et al.) to use this mode for spectral surveys of interesting regions in our Galaxy.

  7. Future Capabilities II • Expand instantaneous spectral coverage to 2 GHz. • Use Mock Spectrometers, but requires IF/LO systems to be modified. • Timescale of 1 - 2 years. • Cost of $100k.

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