| NGC 1023 (UGC 2154, 0237+3850) -- This is an SB0 galaxy that has also been observed with IUE (Kinney et al. 1993). The integrated flux from the weak, centrally-concentrated diffuse emission seen in the HST image agrees well with the IUE 2300 Å flux. This galaxy has also been imaged with HST by Lauer et al. (1995) in the $V$ band, where it displays an unusually high central surface brightness. After deconvolution with the spherically-aberrated PSF, they estimate a surface brightness of 12.7 mag arcsec-2 in the central $0.022", and 13.8 mag arcsec-2 at the $0.1" radius. As in the other 45 early-type galaxies they have studied, the brightness profile continues to increase with decreasing radius all the way down to the HST angular resolution limit. The weak emission we detect from this galaxy in the UV, compared with the high visual surface brightness, confirms that the red leak through the F220W filter makes a negligible contribution to the counts we detect in the UV in other objects (see Section 2 of the paper, and notes on NGC 4636, below).
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