1. 2003-03-21PalSpec Status Review1 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

2. 2003-03-21PalSpec Status Review2 Spectrograph Requirements Original Baseline –Simultaneous coverage from 0.80 – 2.5  m 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 arcmin 2 FoV –Keck slit viewer ~ 40”x40” Delivery –December 2003 –For Keck, delivery TBD

3. 2003-03-21PalSpec Status Review3 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

4. 2003-03-21PalSpec Status Review4 OH Line Positions Positions of atmosphere airglow (OH) lines vs. wavelength overlaid with atmospheric transmission.

5. 2003-03-21PalSpec Status Review5 Perspective Views Collimator Reimager Grating Slit viewer Focal Plane

6. 2003-03-21PalSpec Status Review6 Perspective Views

7. 2003-03-21PalSpec Status Review7 View with Shell

8. 2003-03-21PalSpec Status Review8 6 inches CaF2/CaF2 Infrasil/ZnS/ZnSe ZnSe/ZnSe Asphere Array tilted 1.3 deg Prototype Camera by Jim Howard, Telic Optics Prototype Spectrograph Camera

9. 2003-03-21PalSpec Status Review9 Top/Bottom of 30 arcsec slit Camera Spot Diagrams

10. 2003-03-21PalSpec Status Review10 2 pix radius = 18 micron If 2.78 pix/arcsec (slit width direction): @ Palomar = 72 arcsec @ Keck = 36 arcsec Encircled Energy

11. 2003-03-21PalSpec Status Review11 Spectrum Layout in Focal Plane Possible array rotation (also rotate slit to keep on columns)

12. 2003-03-21PalSpec Status Review12 Spectral Resolution Spectral resolution for 1.0 arcsec slit with 2.78 pixels/arcsecond.

13. 2003-03-21PalSpec Status Review13 Grating Efficiency

14. 2003-03-21PalSpec Status Review14 * includes primary through detector System Throughput Atmospheric transmission Off the array

15. 2003-03-21PalSpec Status Review15 Slit Viewer Design Specs –Operates at Ks –Images to ~ 0.14 arcsec/pix –Giving 2.4 arcmin FoV => 5.7 sq. arcmin Integration Time (sec) Ks mag (S/N = 5) Number of Galaxies Number of Stars 117.231 1018.4151 3019.0271

16. 2003-03-21PalSpec Status Review16 KECK SLIT VIEWER WE’LL USE 256X256 ARRAY FROM EXISTING IR INSTRUMENT FOV EQUIVALENT TO NIRC FOV (40”)

17. 2003-03-21PalSpec Status Review17 Slit Viewer Detection Rate Slit viewer with 2.4 arcmin FoV Counts from Glazebrook et al. 1994, MNRAS, 266, 65. 1 sec 10 sec 30 sec

18. 2003-03-21PalSpec Status Review18 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  Jy/arcsec 2 ) –RN = 5 e-, i(dark) = 0.01 e-/sec KECK SHOULD BE 4x BETTER Flux (10 -17 ergs/cm 2 /s)t back Band600 sec1800 sec3600 sec(sec) J2.11.10.75410 H2.21.20.87170 K3.01.71.257 t back = integration time for RN to contribute < 20% to noise.

19. 2003-03-21PalSpec Status Review19 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  Jy/arcsec 2 ) –RN = 5 e-, i(dark) = 0.01 e-/sec KECK WILL BE 1.5 MAG DEEPER FOR POINT SOURCES Mag in 1 resolution element Band600 sec1800 sec3600 sec J19.720.420.8 H18.819.519.8 K17.718.318.7

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