| M51 (NGC 5194, UGC 8493, 1327+4727) -- This face-on Sbc Seyfert 2 galaxy forms an interacting pair with NGC 5195 and has been the focus of many studies. The archival HST image is a 2277 s exposure with the f/96 FOC in its ``normal'' (i.e., unzoomed) 512 × 512 pixel format, giving a $10" × 10" field of view, and the F275W filter, at an effective wavelength ~2800 Å. The longer wavelength and exposure time make this image about 8 times more sensitive than the standard setup. The image shows X-shaped dust lanes crossing the bright diffuse light distribution, previously noted in visual-band HST images (Ford et al. 1992; see Maran & Kinney 1993), and a number of compact sources on the outskirts of the field.
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