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Spatially Resolved Spectroscopy

Spatially Resolved Spectroscopy. ASTR 3010 Lecture 17 Textbook Ch. 11. Atmospheric Differential Refraction. Slit orientation. to horizon. to horizon. If the slit is not oriented perpendicular to the horizon, there will be a severe slit loss

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Spatially Resolved Spectroscopy

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  1. Spatially Resolved Spectroscopy ASTR 3010 Lecture 17 Textbook Ch. 11

  2. Atmospheric Differential Refraction

  3. Slit orientation to horizon to horizon If the slit is not oriented perpendicular to the horizon, there will be a severe slit loss More seriously, the spectral shape will be systematically distorted!

  4. Longslitspectrscopy • Simplest. • Used a lot in the past. • Long time to make a 2D map.

  5. Keck ESI IFU : Image slicing…

  6. GMOS IFU • Fiber fed spectrograph

  7. Multi-slit Spectrograph • GMOS (Gemini Multi-Object Spectrograph) • mask slit (hundreds possible) + grating

  8. multi-Object Spectrgraph • 6dF (6 degree Field) : Anglo Australian Observatory (on 4m or 1m UKST) • fibre based. About 150 objects can be observed spectroscopically in a single shot.

  9. 6dF Fibre positioning in action (takes about 30 min to configure).

  10. 6dF 2dF at the Prime focus of 4m AAT telescope.

  11. IFU science • Keplerian rotating young disk

  12. IFY science : beating the sky • Night sky OH line emissions

  13. Speckle Suppresion • GPI: R~45 IFU

  14. In summary… Important Concepts Important Terms • Slit orientation • 2D spectroscopy • Multi-object spectrograph • Integral Field Spectrograph • Chapter/sections covered in this lecture : Ch 11

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