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Introduction

The South Galactic Cap U-band Sky Survey (SCUSS) is an international cooperative project between National Astronomical Observatories, Chinese Academy of Sciences and Steward Observatory, University of Arizona, USA. We plan to perform a sky survey of about 3700 square degree field of the south Galactic cap in U-band (3550 Å) with the 90 inch (2.3 m) Bok telescope , which belongs to the Steward Observatory, University of Arizona and it is located on the Kitt Peak. The telescope equipped with four 4K × 4K CCD mosaic (64-magapixel) and the field of view is 1.0316 deg × 1.0770 deg. The exposure time is 5 minutes and the limiting magnitude will reach about 23 mag (signal-to-noise = 5).


Fig.1 The green area is our U-band Sky Survey region. The black solid line is the Galactic plane and the three stripes are SDSS dr7 observations.

The project started in the summmer of 2009 and the observations are being carried out from September 2010 to December 2012. The main aim is to supply a U-band catalog for LAMOST of China. SDSS III will supply the photometry in g (4100 Å), r (5500 Å), i (6940 Å), z (8470 Å) in the South Galactic cap. Combined with the photometry with these bands and our u-band, we can get the Spectral Energy Distributions (SEDs) of the sources in the south Galactic cap from 3550 Å to 8470 Å.




The latest footprint of our survey

The progress record of our observations for each day:
2010- All 15 Nights
2011- September 17 18 19 20 21 22 23 -October 24 25 26 27 28 29 30 31 -November 22 23 24(rainy) 25 26 27 28 29 30(windy) -December 23 24(Christmas Eve) 25 26 27 28 29 30 31
2012- September 17 18 19 20 -October 8 9 10 11 12 13 14 15 16 17 18 19 20 -November 8(rainy) 9(windy) 10(cloudy) 11(reobs bad fields) 12 13 14 15(cloudy)
2013 -September 11 24&25&26(cloudy)&27-reobserve bad quality fields 28 29 30 -October 1 2 3 4 5 6

The real-time image being observed (click to see)


Below there are the images of a drawf galaxy IC 1613 (left) and a barred spiral galaxy NGC 1073 (right). Our images are grey and SDSS images are colorful.

Image of M31 taken by our survey:






Copyright Steward Observatory, University of Arizona and National Astronomical Observatories, Chinese Academy of Sciences, 2009, All rights reserved.