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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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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;

  • 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.


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。


Project Directors

  • PI: Prof. Xu Zhou

  • PI: Prof. Michael Lesser


The Bok

  • Organization: Steward Observatory.

  • Location: Kitt Peak, Arizona, USA

  • Wavelength: optical, infrared

  • Diameter: 2.3m (90 inches)


Location―Kitt Peak

  • Altitude: 6,900 ft (2071 m)

  • Latitude: +31° 57' 46.5“

  • Longitude: 111°36' 01.6"W

  • Time Zone: +7 hours


The Telescope

The Bok 90 inch (2.3 meter) Reflector Telescope


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°


CCD configuration


The CCD Overlapping


The CCD Mosaic


CCD QE


SDSS DR7


The U-band Sky MAP


The U-band Sky Survey


Flux Calibration


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


Thank you!


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