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Astr110 Photography Projects, Fall 2004

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Deer Lick Group, Katie Allodi

Deer Lick Group

This object is NGC7331, or more commonly known as the Deer Lick Group. It is a spiral galaxy, which is a galaxy that looks like a flat, white disk, and has bulges at their centers. The bulges usually appear yellowish. Cool gas and dust is dispersed throughout the disk with hotter ionized gas. The spiral arms that can be seen around the bulge are bright, prominent arms in a spiral pattern. Discovered in the year 1784, the group is one of the brighter galaxies noted. William Herschel is credited with the discovery, which was one of the earliest recognized of its kind. A supernova was discovered in this galaxy by Milton Humason. A supernova is simply the explosion of a star. The one in this group is quite bright, at 13.4 mag.

The group can be seen quite easily in this photograph. The fine spiral structures, or spiral arms, are very distinctive. In addition to the group, this photograph also shows many other galaxies, which can be seen in the background. The other galaxies are directly to the left of NGC7331. The photo is in black and white, which indicates that it has not been enhanced dramatically. Some noise, which shows up on the photo looking like dust particles, have been elimintated so that the spiral arms can be seen more clearly. Overall, this picture shows the awesomeness of God's creativity!

References:
Bennett, Jeffery. The Cosmic Perspective. Page G-10 through 11

Frommert, Hartmut. http://www.seds.org/messier/xtra/ngc/n7331.html

Right Ascension (J2000) 22 : 37.1(h:m)
Declination (J2000) +34 : 25(deg:m)
Filters used clear(C)
Exposure time per filter 300 seconds
Date/Time

November 16, 2004