June 30, 2010 Nanning, Guangxi NAOC and Steward Observatory of UA The South Galactic Cap U-band Sky Survey with Bok 2.3m Telescope Fan Zhou (NAOC)

Why do we need the survey? 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.

Science 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

Science  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。

Project Members PI: Xu Zhou (NAOC) PI: Michael Lesser (SO/UA) Edward Olszewski(UA) Xiaohui Fan(UA) Yipeng Jing(SHAO) Zhaoji Jiang(NAOC/PKU) Xuebin Wu(PKU) Weipeng Lin(SHAO) Shiyin Shen(SHAO) Zhou Fan(NAOC) Zhenyu Wu(NAOC) …….

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

Flat fielding

10-second Flat

Telescope Control Room

Michael was working in the Lab…

CCD Lab

CCD configuration NAOC has spent $365,000 for the new CCD Mosaic according to the contract.

The 3×3 Pointings one field of view= deg^2 Uncovered squre= deg^ % 1 time cover= deg^ % 2 time cover= deg^ %

The Telescope Moving Speed in RA N1= 28 N2= 30 V_RA(+)= SEC/DEG V_RA(-)= SEC/DEG

The Telescope Moving Speed in DEC N1= 30 N2= 30 V_DEC(+)= SEC/DEG V_DEC(-)= SEC/DEG

The weather statistics of Bok

The seeing distributions of Bok

If we have 55 nights, then Exp Time of Each Field=(55 nights ×10 hours / nights ×65% useful night )/ 3700deg^2=5.80 min/deg^2 If we have 80 nights, then Exp Time of Each Field=(80 nights ×10 hours / nights ×65% useful night )/3700deg^2=8.43 min/deg^2 Total Observation Time

Bok 300 s SDSS 53 s Bok 300s exposure is ~1.5 mag deeper than SDSS

Bok 300s e ~1.5 mag deeper than SDSS Limiting Mag (S/N=10)= — Limiting Mag (S/N=10)= = 1.43 mag Limiting Mag (S/N= 5)= — Limiting Mag (S/N= 5)= = 1.59 mag

Bok 300s e ~1.5 mag deeper than SDSS Limiting Mag (S/N=10)= — Limiting Mag (S/N=10)= = 1.52 mag Limiting Mag (S/N= 5)= — Limiting Mag (S/N= 5)= = 1.44 mag

The u-band Sky MAP

The u-band Sky Survey and SDSS Dr7

Survey Priority

SDSSIII Fields Use SDSS data to do the Flux Calibration for our uband survey?

Extinction Distribution

The BATC Fields

cp edo_a fits edo.fit ! for simple coord8 edo ! turn map, coordination, produce uedo.fit badline uedo ! bad line corrected sex uedo.fit ! produce test.cat 1538 chbercoo uedo ! produce uedo.coo, delete edge 10 line 1271 pip231 uedo 1245 coo2als uedo ! putcoo uedo coo2als.dat, will delete it 4 checkmis uedo ! produce miss.dat, all missed are cosmos 26 getcosmos uedo ! from uedo.als <-10, produce cosmos.dat, 107 ! reorder uedo.coo, count in coo2als.dat 1164 pip231 uedo 1163 coo2als uedo ! 0 checkmis uedo ! 108 getcosmos uedo ! cosmos.dat 109 ! uedo.coo 1162 pip231 uedo ! putcoo uedo cosmos.dat ! produce uedocosmos.fit putcoo uedo uedo.als ! produce uedoals.fit ds9 uedocosmos.fit ds9 uedoals.fit uedo.fits dispsfber uedo extrcat uedo ! extract..from test.cat & uedo.als, prod uedo.ext lastcat uedo [1.0] ! [1.0] is sharpness Data Reduction Catalogues

Photometry Comparisons

Color Term

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