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The South Galactic Cap U-band Sky Survey Zhou, Xu ; Fan, Zhou et al. zfan@naos

The South Galactic Cap U-band Sky Survey Zhou, Xu ; Fan, Zhou et al. zfan@nao.cas.cn NATIONAL ASTRONOMICAL OBSERVATORIES, CAS STEWARD OBSERVATORY, UNIVERSITY OF ARIZONA. Abstract

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The South Galactic Cap U-band Sky Survey Zhou, Xu ; Fan, Zhou et al. zfan@naos

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  1. The South Galactic Cap U-band Sky Survey Zhou, Xu; Fan, Zhou et al. zfan@nao.cas.cn NATIONAL ASTRONOMICAL OBSERVATORIES, CAS STEWARD OBSERVATORY, UNIVERSITY OF ARIZONA • Abstract • The South Galactic Cap U-band Sky Survey is an international cooperative project between National Astronomical Observatories, Chinese Academy of Sciences and the Steward Observatory, University of Arizona. We plan to perform a sky survey of about 3700 square degree filed of the south Galactic Cap in U-band (λ=3550 Ǻ) with the 2.3 m Bok telescope, which belongs to the Steward Observatory, University of Arizona. The Project has started in the summer of this year and the observation will be from the November of 2009 to December of 2012. The main aim is to supply a U-band input catalogue for LAMOST. The Pan-STARRS will supply photometry in g-band (4100 Å)，r-band (5500 Å)，i-band (6940 Å)，z-band (8470 Å)and the Y-band (9600 Å) in the south Galactic cap. Then we can get the Spectral Energy Distributions (SEDs) of all the sources in the south Galactic cap from 3550-9600 Å. With these SEDs, we can achieve the scientific goals below. • Scientific Goals • To supply the input source catalogue for LAMOST; • To classify of the stars, galaxies, AGN and quasars in the south Galactic cap region with the color-color diagram; • To detect the red shift z<3 quasar candidates combining the photometry in other bands; • To estimate the red shift of the galaxies with PhotoZ combining the photometry in other bands; • To find out some starburst galaxies candidates; • It can help us estimate the metallicity of the stellar populations in the galaxies; • 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; • It can be helpful for the flux calibration of the LAMOST spectra. The Bok 90 inch (2.3 m ) Telescope The Bok 90 inch (2.3 meters) reflector telescope, which belongs to the Steward Observatory of University of Arizona, will be used for our U-band Sky Survey. The Bok telescope is located in the Kitt Peak of Arizona State, where the elevation is about 2070m. The latitude is +31°57 ' 46.5 ' ' and the longitudeis 111°36' 01.6 ' ' W. The filed of view (FOV) is over 1×1 deg2. A four 4k×4k CCD mosaic will be mounted on the focal plane of the telescope. We plan to have the exposure time t=5 minute, then the limiting magnitude can reach dedper than U=23 mag for the signal-to-noise ratio=10. The green region is the south Galactic cap U-band sky survey filed. The observation will be carried out in the dark nights from every September to December of the year 2009-2012. We have 55-80 dark night totally. Each pointing will be observed at least for three times. Then the images can be combined to eliminate the cosmic rays and to enhance the signal-to-noise ratios. The south Galactic cap b <－30°, DEC >－10° 3700 deg2 region

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