A spiral galaxy in Antlia, NGC 2997
AAO image reference AAT 17a.     « Previous || Next »

A spiral galaxy in Antlia, NGC 2997, ngc2997.jpg
Top left is NE. Image width is about 24 arc min
Image and text 1999-2010, © Australian Astronomical Observatory, photograph by David Malin.

NGC 2997 is a fine southern spiral galaxy seen from a distance of about 45 million light years. It is in Antlia and is inclined at about 45 degrees to our line of sight, revealing its internal structure and giving the galaxy an oval appearance. Seen face-on, NGC 2997 would look rather like Messier 83. Like most spirals, the galaxy has two prominent spiral arms, which appear to originate in the yellow nucleus, are peppered with bright red blobs of ionised hydrogen which are similar to regions of star formation in our own Milky Way. Within these gas clouds are produced the hot blue stars which generate most of the light in the arms of the galaxy. A much older population of yellowish stars are concentrated around the nucleus. A much deeper image shows that the galaxy is much bigger than it appears above.

Related Images
AAT 8.       The spiral galaxy M83
AAT 17.     A spiral galaxy in Antlia, NGC 2997, wide field view
AAT 15c.   The Helix nebula, unsharp mask, same scale as image above
n2997_d    NGC 2997, deep image
Constellation of Antlia (external site)

For other details of photographic exposure, search technical table by AAT reference number.

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Updated by David Malin, 2010, August 1