PDA

View Full Version : Discussion: Starbirth in NGC 6946



Fraser
2005-Jan-03, 06:48 PM
SUMMARY: The powerful Gemini Observatory took this image of spiral galaxy NGC 6946, which is awash in star formation. This image was taken with a special filter designed to highlight the regions of star formation. Astronomers aren't sure why this galaxy is so furiously building new stars, compared to the other galaxies in our local neighborhood. And all this starbirth leads to supernovae, which are explosions of massive stars that "live fast and die young." Just in the last century, astronomers have seen 8 supernovae explode - more than any other galaxy ever observed.

View full article (http://www.universetoday.com/am/publish/starbirth_ngc6946.html)

What do you think about this story? Post your comments below.

antoniseb
2005-Jan-03, 06:50 PM
One of the final items in this story is probably the key to why this galaxy is so vigorous in star-birth.

Its optical angular diameter is about 13 arcminutes, but viewed at radio wavelength at the frequency of neutral hydrogen (1420 Mhz or 21-cm line), it extends considerably more than the angular diameter of the Moon.


This galaxy has a huge amount of incoming Hydrogen feeding the creation of new stars.

Greg
2005-Jan-03, 11:08 PM
I wonder how old the galaxy is? It must realtively young or just fortunate to run through a interstellar hydrogen cloud at this time.

dmccarroll
2005-Jan-04, 08:13 PM
Does anyone know if there were any photographs taken of the 2004 supernova?

antoniseb
2005-Jan-04, 08:21 PM
Originally posted by dmccarroll@Jan 4 2005, 08:13 PM
Does anyone know if there were any photographs taken of the 2004 supernova?
Here's a link to a web page about this particular supernova.
SN 2004et (http://www.rochesterastronomy.org/sn2004/sn2004et.html)

There are several images of it there.