nov 26, 2009 chongqing naoc and steward observatory the south galactic cap u-band sky survey with...

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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

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Page 1: 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

Nov 26, 2009 Chongqing

NAOC and Steward Observatory

The South Galactic Cap U-band Sky Survey with the Bok

2.3m TelescopeFan Zhou

NAOC

Page 2: 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.

Page 3: 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

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

Page 4: 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

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。

Page 5: 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

The Bok

• Organization: Steward Observatory.

• Location: Kitt Peak, Arizona, USA

• Wavelength: optical, infrared

• Diameter: 2.3m (90 inches)

Page 6: 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

Location―Kitt Peak

• Altitude: 6,900 ft (2071 m)

• Latitude: +31° 57' 46.5“

• Longitude: 111°36' 01.6"W

• Time Zone: +7 hours

Page 7: 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

The Bok 90 inch (2.3 meter) Reflector Telescope

The Telescope

Page 8: 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

PI: Xu Zhou (NAOC)

PI: Michael Lesser (SO/UA)

Page 9: 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
Page 10: 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
Page 11: 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
Page 12: 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.SDSS Filters (u',g',r', i',z'-band)

2.New Johnson / Bessel Filters

3. Pan-STARRS Filter (g, r, i, z, y)

Page 13: 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
Page 14: 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

CCD configuration

Page 15: 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
Page 16: 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

CCD QE

Page 17: 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

The U-band Sky MAP

Page 18: 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

The U-band Sky Survey

Page 19: 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

Calibration time: 387×3min=21 hours

Page 20: 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

• 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

Page 21: 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

• For each pointing: 4×33Mb×3 times=0.4G• 3700 deg2 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

Page 22: 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

Finding chart, images, search,download,catalogs

The Database

Page 23: 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

Zhou Xu , Fan Zhou, et al.

Page 24: 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

• 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 0.27. • The boundary layer thickness of dome A is ∼ 10 m which is

much thinner than that of dome C.

Page 25: 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

There are 16918, 50575, 68157, 110357, 58711 and 5749 images in March, April, May, June, July and August, respectively.The total exposure time is 67.37, 311.39, 378.65, 613.09, 326.17 and 31.94 hours, respectively, in these months and the total exposure time is 1728.61 hours.

Page 26: 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
Page 27: 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

Monet et al. (2003) derived the formula for transforming the magnitudes of USNO-B1.0 to the magnitudes in SDSS filters with ∼450 deg2 of SDSS Early Data Release <i CSTAR − i USNO >= 4.1561 ±0.1225 with 48 points.

Page 28: 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

A bright star of 10.1 mag (14h32m31.5s ,−87◦56 09.2 )

Page 29: 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
Page 30: 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
Page 31: 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

The catalogue header: -59 2008 Jun 02 22:50:42.20 20 357 A 10398

154.954086 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=10.398 (6) 154.954086 Julian time. The full catalogues can be downloaded on http://batc.bao.ac.cn/ zhouxu/.

Page 32: 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

Thank you!