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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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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

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 survey1

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

Project Directors

  • PI: Prof. Xu Zhou

  • PI: Prof. Michael Lesser


Oct 16 2009 kaifeng

The Bok

  • Organization: Steward Observatory.

  • Location: Kitt Peak, Arizona, USA

  • Wavelength: optical, infrared

  • Diameter: 2.3m (90 inches)


Oct 16 2009 kaifeng

Location―Kitt Peak

  • Altitude: 6,900 ft (2071 m)

  • Latitude: +31° 57' 46.5“

  • Longitude: 111°36' 01.6"W

  • Time Zone: +7 hours


Oct 16 2009 kaifeng

The Telescope

The Bok 90 inch (2.3 meter) Reflector Telescope


Oct 16 2009 kaifeng

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°


Oct 16 2009 kaifeng

CCD configuration


Oct 16 2009 kaifeng

The CCD Overlapping


The ccd mosaic

The CCD Mosaic


Oct 16 2009 kaifeng

CCD QE


Oct 16 2009 kaifeng

SDSS DR7


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The U-band Sky MAP


Oct 16 2009 kaifeng

The U-band Sky Survey


Flux calibration

Flux Calibration


Oct 16 2009 kaifeng

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


Oct 16 2009 kaifeng

Thank you!


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