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PalSpec Status Review WITH NOTES RE KECK APPLICATION

PalSpec Status Review WITH NOTES RE KECK APPLICATION. Terry Herter, Chuck Henderson (Cornell) John Wilson, Mike Skrutskie (Univ. or Virginia) Keith Matthews (Caltech), Jim Howard (Telic) March 21, 2003. Spectrograph Requirements. Original Baseline Simultaneous coverage from 0.80 – 2.5 m m

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PalSpec Status Review WITH NOTES RE KECK APPLICATION

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  1. PalSpec Status ReviewWITH NOTES RE KECK APPLICATION Terry Herter, Chuck Henderson (Cornell) John Wilson, Mike Skrutskie (Univ. or Virginia) Keith Matthews (Caltech), Jim Howard (Telic) March 21, 2003 PalSpec Status Review

  2. Spectrograph Requirements • Original Baseline • Simultaneous coverage from 0.80 – 2.5 mm • Emphasis on J, H, and K bands • R ~ 2500 with 30 x 0.9 arcsec slit • For keck R~2500 with slit ~ 15 x 0.45 arcsec • Slit viewer with > 2x2 arcmin2 FoV • Keck slit viewer ~ 40”x40” • Delivery • December 2003 • For Keck, delivery TBD PalSpec Status Review

  3. WHY DOES IT WORK ON KECK • Instrument is being designed to study faint, small (<~1”) objects, one at a time • f number: at palomar 16, keck 16.6 • Seeing at keck ~1/2 that at Palomar • =>palomar instrument will work at keck with fov reduced by factor of 2 PalSpec Status Review

  4. OH Line Positions Positions of atmosphere airglow (OH) lines vs. wavelength overlaid with atmospheric transmission. PalSpec Status Review

  5. Perspective Views Focal Plane Grating Reimager Collimator Slit viewer PalSpec Status Review

  6. Perspective Views PalSpec Status Review

  7. View with Shell PalSpec Status Review

  8. CaF2/CaF2 Infrasil/ZnS/ZnSe ZnSe/ZnSe Asphere Asphere 6 inches Array tilted 1.3 deg Prototype Spectrograph Camera Prototype Camera by Jim Howard, Telic Optics PalSpec Status Review

  9. Top/Bottom of 30 arcsec slit Camera Spot Diagrams PalSpec Status Review

  10. 2 pix radius = 18 micron If 2.78 pix/arcsec (slit width direction): @ Palomar = 72 arcsec @ Keck = 36 arcsec Encircled Energy PalSpec Status Review

  11. Spectrum Layout in Focal Plane Possible array rotation (also rotate slit to keep on columns) PalSpec Status Review

  12. Spectral Resolution Spectral resolution for 1.0 arcsec slit with 2.78 pixels/arcsecond. PalSpec Status Review

  13. Grating Efficiency PalSpec Status Review

  14. System Throughput Atmospheric transmission * includes primary through detector Off the array PalSpec Status Review

  15. Slit Viewer • Design Specs • Operates at Ks • Images to ~ 0.14 arcsec/pix • Giving 2.4 arcmin FoV => 5.7 sq. arcmin PalSpec Status Review

  16. KECK SLIT VIEWER • WE’LL USE 256X256 ARRAY FROM EXISTING IR INSTRUMENT • FOV EQUIVALENT TO NIRC FOV (40”) PalSpec Status Review

  17. 30 sec 10 sec 1 sec Slit Viewer Detection Rate Slit viewer with 2.4 arcmin FoV Counts from Glazebrook et al. 1994, MNRAS, 266, 65. PalSpec Status Review

  18. Spectrograph Line Sensitivity • Assumptions • S/N = 5, 10 pixels to extract line • System throughput = 0.15 in all bands • Between OH-lines (J,H,K bkgnd = 70, 200, 70 mJy/arcsec2) • RN = 5 e-, i(dark) = 0.01 e-/sec • KECK SHOULD BE 4x BETTER tback = integration time for RN to contribute < 20% to noise. PalSpec Status Review

  19. Spectrograph Continuum Sensitivity • Assumptions • S/N = 5 per resolution element • System throughput = 0.15 in all bands • Between OH-lines (J,H,K bkgnd = 70, 200, 70 mJy/arcsec2) • RN = 5 e-, i(dark) = 0.01 e-/sec • KECK WILL BE 1.5 MAG DEEPER FOR POINT SOURCES PalSpec Status Review

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