Ultraviolet Galaxy Number Counts From Swift UV/Optical Telescope Observations of the Extended Chandra Deep Field South

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We present galaxy number counts in four Swift UV/Optical Telescope
(UVOT) filters. UVOT observed the Extended Chandra Deep Field South
for a total of 568,000 seconds split between the uvw2 (2030 A), uvm2 (2231 A), uvw1 (2634 Α) and u (3501 A) filters. Number counts cover a range of AB magnitudes from 21 - 26 in uvw2 to 20 - 24.5 in u. The UVOT number counts bridge the gap between the GALEX NUV number counts (Xu, et al. 2005) and HST STIS NUV number counts (Gardner, Brown, & Ferguson 2000) and are consistent with both. UVOT is particularly well suited to probe this parameter space as it has a smaller PSF than GALEX which makes it possible to go deeper without reaching the confusion limit, while the UVOT field of view is larger than STIS which allows for better statistics of objects on the bright end of their range. UVOT number counts are used in conjunction with the GALEX and STIS results and ground based observations in the u band to constrain models of galaxy evolution.

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