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Wildrik Botjes Planetarium
Physics & Astronomy Department

Astr112 Photography Projects, Spring 2006

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NGC 3628 , Kathleen Merz

NGC 3628

This is the galaxy NGC 3628, about 30 or 35 million light years from earth in a group of galaxies known as the Leo Triplet. It is a spiral galaxy, meaning that it consists of a central bulge and arms that spiral away from this bulge, much like the Milky Way. NGC 3628 was discovered on April 8, 1784 by William Herschel. It is remarkable because its dust band, slightly deformed at the edges, gives evidence of gravitational interactions between it and the two other galaxies of the Leo Triplet.

This image shows NGC 3628 edge-on, giving a good view of its dust lanes. These dust lanes, characteristic of spiral galaxies, partially obscure the bright bulge, which is the galaxy's central bulge. The dust lanes seem to flare out a bit at the edges, and the bulge of the galaxy has what some describe as a "peanut shape," both giving evidence of gravitational interactions. In this image, NGC 3628 has an angular size of about 15 arcminutes, giving a linear size of about 150,000 light years across, similar to the Milky Way.

References:
http://www.rc-astro.com/galaxies/ngc3628.html

http://www.aao.gov.au/images/captions/aat063.html

http://www.seds.org/messier/xtra/ngc/n3628.html

Right Ascension (J2000) 11:20:18
Declination (J2000) 13:36:00
Filters used clear(C)
Exposure time per filter 4x300 seconds in C
Date observed

March 21, 2006 (C)