NGC 7331
NGC 7331 (C30) is a type-Sb spiral galaxy in the constellation Pegasus. It is one of the brighter galaxies not in the popular Messier Catalog and is at a distance of about 46 million light years. At least three additional galaxies can be seen to the right in this image. At the upper right is NGC 7337; the middle of the three is NGC 7335, while the lower faint galaxy is NGC 7336. Recent X-ray observations (Stockdale, et al. 1998) of NGC7331 have indicated the probable presence of a massive black hole at the center of this galaxy. More information about NGC 7331 can be found at the SEDS NGC7331.
This image is a composite of 15, 20-second exposures from 22 December 1997.
The above image was taken on 27 June 1999 and is a 28.75-minute composite of 115, 15-second exposures. This image was processed by using a gammalog filter during the stacking process using Multi245, followed by a mild power-law unsharp mask in CB245. This resultant image was then Histogram Optimized to highlight the faint outer arms, followed by two iterations of an Advanced Loop in Megafix.
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