1. 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)

2. 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.

3. 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

4. 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。

5. 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) …….

6. The Bok Organization: Steward Observatory. Location: Kitt Peak, Arizona, USA Wavelength: optical, infrared Diameter: 2.3m (90 inches)

7. Location―Kitt Peak Altitude: 6,900 ft (2071 m) Latitude: +31° 57' 46.5“ Longitude: 111°36' 01.6"W Time Zone: +7 hours

8. The Bok 90 inch (2.3 meter) Reflector Telescope The Telescope

9. Flat fielding

10. 10-second Flat

11. Telescope Control Room

12. Michael was working in the Lab…

13. CCD Lab

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

16. The 3×3 Pointings one field of view= 1.028 deg^2 Uncovered squre= 0.001 deg^2 0.141% 1 time cover= 0.116 deg^2 11.288% 2 time cover= 0.911 deg^2 88.571%

17. The Telescope Moving Speed in RA N1= 28 N2= 30 V_RA(+)= 6.50402451 SEC/DEG V_RA(-)= 7.75749779 SEC/DEG

18. The Telescope Moving Speed in DEC N1= 30 N2= 30 V_DEC(+)= 12.63 SEC/DEG V_DEC(-)= 12.56 SEC/DEG

19. The weather statistics of Bok

20. The seeing distributions of Bok

21. 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

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

23. Bok 300s e ~1.5 mag deeper than SDSS Limiting Mag (S/N=10)= 21.91 — Limiting Mag (S/N=10)= 20.48 = 1.43 mag Limiting Mag (S/N= 5)= 22.68 — Limiting Mag (S/N= 5)= 21.09 = 1.59 mag

24. Bok 300s e ~1.5 mag deeper than SDSS Limiting Mag (S/N=10)= 21.91 — Limiting Mag (S/N=10)= 20.39 = 1.52 mag Limiting Mag (S/N= 5)= 22.68 — Limiting Mag (S/N= 5)= 21.24 = 1.44 mag

25. The u-band Sky MAP

26. The u-band Sky Survey and SDSS Dr7

27. Survey Priority

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

29. Extinction Distribution

30. The BATC Fields

31. cp edo_a1413.0053.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 ! 1162 -------------------------------------------------------------------------------- putcoo uedo cosmos.dat ! produce uedocosmos.fit putcoo uedo uedo.als ! produce uedoals.fit ds9 uedocosmos.fit ds9 uedoals.fit uedo.fits dispsfber uedo 5 -------------------------------------------------------------------------------- extrcat uedo ! extract..from test.cat & uedo.als, prod uedo.ext lastcat uedo [1.0] ! [1.0] is sharpness Data Reduction Catalogues

32. Photometry Comparisons

33. Color Term

34. Thanks! Welcome to visit us: http://batc.bao.ac.cn/Uband/