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 MembersPI: 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= 1.028 deg^2Uncovered 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%

The Telescope Moving Speed in RA

N1= 28 N2= 30 V_RA(+)= 6.50402451 SEC/DEG V_RA(-)= 7.75749779 SEC/DEG

The Telescope Moving Speed in DEC

N1= 30 N2= 30 V_DEC(+)= 12.63 SEC/DEG V_DEC(-)= 12.56 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)= 21.91 — Limiting Mag (S/N=10)= 20.48 = 1.43 magLimiting Mag (S/N= 5)= 22.68 — Limiting Mag (S/N= 5)= 21.09 = 1.59 mag

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

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_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

Photometry Comparisons

Color Term

Thanks!

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