Nov 26, 2009 Chongqing NAOC and Steward Observatory The South Galactic Cap U-band Sky Survey with the Bok 2.3m Telescope Fan 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 ：不同类型的恒星在双色图上的位置是 不同的

 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。  图 1 ： BC03 模型中太阳金属丰度下星族 的谱能量分布随年龄的变化。

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

PI: Xu Zhou (NAOC) PI: Michael Lesser (SO/UA)

1.SDSS Filters (u',g',r', i',z'-band) 2.New Johnson / Bessel Filters 3. Pan-STARRS Filter (g, r, i, z, y)

CCD configuration

CCD QE

The U-band Sky MAP

The U-band Sky Survey

Calibration time: 387×3min=21 hours

If we have 55 nights: 55 nights ×10 hours / nights =550 hours Each field: (550 hours×65% useful night - 21)/3700=5.46 min If we have 80 nights: 80 nights ×10 hours / nights =800 hours Each field: (800 hours×65% useful night - 21)/3700=8.09 min Total Observation Time

For each pointing: 4×33Mb×3 times=0.4G 3700 deg 2 region=3700×0.4 G=1480 G Flux calibration observations: 3700/9 × 4×33M×2 (Standard star and objects)=108.5 G FLAT: 15 × 4 frames × 20 M × 80 Nights=96 G BIAS:15 ×4 frames × 20 M × 80 Nights=96 G Total Size=1781 G≈1.8 T Catalogues: Point sources and extended sources? We need the Database and Search like SDSS The Data Storage

 Finding chart, images, search,download,catalogs The Database

Zhou Xu, Fan Zhou, et al.

In Jan 2008, Chinese Small Telescope ARray (CSTAR) was successfully mounted in the highest plateau of Antarctic - Dome A by the 24th Chinese expedition team. CSTAR - four 14.5 cm telescopes g, r, i and white filters FOV: 4.5 ◦ × 4.5 ◦ The Dome A locates at 77 ◦ 0657E -80 ◦ 2508S (1271 km from Zhongshan Station. The altitude ∼ 4093 meters The temperature is quite low to − 81 ◦ C the PWV of dome A is supposed to be only half of that in dome C The median seeing of dome A should be less than The boundary layer thickness of dome A is ∼ 10 m which is much thinner than that of dome C.

There are 16918, 50575, 68157, , and 5749 images in March, April, May, June, July and August, respectively. The total exposure time is 67.37, , , , and hours, respectively, in these months and the total exposure time is hours.

Monet et al. (2003) derived the formula for transforming the magnitudes of USNO-B1.0 to the magnitudes in SDSS filters with ∼ 450 deg 2 of SDSS Early Data Release = ± with 48 points.

A bright star of 10.1 mag (14h32m31.5s,−87 ◦ )

 The catalogue header: Jun 02 22:50: A   NOTE-The header parameter mean: (1)-59: temperature (2)2008 Jun 02: date (3)20: exposure time in second (4) 357: sky light ADU value (5) 10398:  mag= (6) Julian time. The full catalogues can be downloaded on zhouxu/.

Thank you!