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Oct 16, 2009 Kaifeng

NAOC and Steward Observatory The South Galactic Cap U-band Sky Survey with the Bok 2.3m Telescope. Fan Zhou NAOC. Oct 16, 2009 Kaifeng. Why do we need the survey?. To supply the input source catalogue for LAMOST;

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Oct 16, 2009 Kaifeng

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  1. NAOC and Steward Observatory The South Galactic Cap U-band Sky Survey with the Bok 2.3m Telescope Fan Zhou NAOC Oct 16, 2009 Kaifeng

  2. Why do we need the survey? • To supply the input source catalogue for LAMOST; • To classify of the stars, galaxies, AGN and quasars in the south Galactic cap region with the color-color diagram; • To detect the red shift z<3 quasar candidates combining the photometry in other bands; • To estimate the red shift of the galaxies with PhotoZ combining the photometry in other bands; • To find out some starburst galaxies candidates; • It can help us estimate the metallicity of the stellar populations in the galaxies; • To identify the type of the stars in the color-color diagram combining the photometry in other bands, which can help us the control the completeness of the star type for the LAMOST observations; • It can be helpful for the flux calibration of the LAMOST spectra.

  3. Why do we need the survey? 图1：SDSS测光中的恒星（×），星系（△）和类星体（其中红移z< 3.5的源用□表示，红移z≥ 3.5的源用■表示）的双色图。 图2：1个太阳质量，年龄是1 Gyr的谱能量分布随金属丰度的变化。

  4. Project Directors • PI: Prof. Xu Zhou • PI: Prof. Michael Lesser

  5. The Bok • Organization: Steward Observatory. • Location: Kitt Peak, Arizona, USA • Wavelength: optical, infrared • Diameter: 2.3m (90 inches)

  6. Location―Kitt Peak • Altitude: 6,900 ft (2071 m) • Latitude: +31° 57' 46.5“ • Longitude: 111°36' 01.6"W • Time Zone: +7 hours

  7. The Telescope The Bok 90 inch (2.3 meter) Reflector Telescope

  8. CCDs • Focal Plane Array • CCDs: Four Lockheed Martin CCD4185 (unpackaged = CCD485 packaged) • Single CCD Format: 4096 x 4097 pixels • Single CCD Active Area: 61.20 mm x 61.21 mm • Inter-CCD Gap: 15.76 mm (~1050 pixels) • Total Focal Plan Array Area: 138.16 mm x 138.18 mm • Total Active Area: 122.40 mm x 122.42 mm • Total Pixel Count: 4 x 4096 x 4097 = 67125248 • Pixel Size: 15 µm • Plate Scale: 30.20"/mm • Pixel Scale: 0.453"/pixel • Edge-to-Edge Field-of-View: 1.159° x 1.159° • Active Field-of-View: 1.027° x 1.027°

  9. CCD configuration

  10. The CCD Overlapping

  11. The CCD Mosaic

  12. CCD QE

  13. SDSS DR7

  14. The U-band Sky MAP

  15. The U-band Sky Survey

  16. Flux Calibration

  17. Total Observation Time • If we got 55 nights: 55 nights ×10 hours / nights =550 hours • Calibration: 387×3min=21 hours • Each field: (550-21)hours×3/4 clear night/3700=6.43 min • If we got 80 nights: 80 nights ×10 hours / nights =800 hours • Each field: (800-21)hours×3/4 clear night/3700=9.47 min

  18. Thank you!

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