June 30 , 2010 Nanning, Guangxi
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Transcript of June 30 , 2010 Nanning, Guangxi
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/