oct 16, 2009 kaifeng
DESCRIPTION
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; - PowerPoint PPT PresentationTRANSCRIPT
Oct 16, 2009 Kaifeng
NAOC and Steward Observatory
The South Galactic Cap U-band Sky Survey with the Bok
2.3m TelescopeFan Zhou
NAOC
1. To supply the input source catalogue for LAMOST; 2. To classify of the stars, galaxies, AGN and quasars in the south
Galactic cap region with the color-color diagram;3. To detect the red shift z<3 quasar candidates combining the
photometry in other bands;4. To estimate the red shift of the galaxies with PhotoZ combining the
photometry in other bands;5. To find out some starburst galaxies candidates;6. It can help us estimate the metallicity of the stellar populations in the
galaxies;7. 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;
8. It can be helpful for the flux calibration of the LAMOST spectra.
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。
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 Bok 90 inch (2.3 meter) Reflector Telescope
The 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
CCD QE
SDSS DR7
The U-band Sky MAP
The U-band Sky Survey
• 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
Total Observation Time
Thank you!