Spiral and Seyfert Galaxies

Chef StiX · Post by **Chef StiX** » Wed Jun 21, 2006 5:31 pm

Does anybody know if there is a way to look at an APOD picture of a spiral galaxy and visually tell if it is a seyfert galaxy as well? I know there some of the cores in pictures appear brighter but does that mean anything?

Galactic Groove · Post by **Galactic Groove** » Wed Jun 21, 2006 7:06 pm

Just did some quick research on this and I think what makes a galaxy classified as a Seyfert Galaxy, apart from the "bright emission lines," is the varying brightness of it over time... so a single, still picture of a spiral galaxy wouldn't do. You'd need a series of time lapse photos (generally over the period of a year) to determine this.

harry · Post by **harry** » Fri Jun 23, 2006 4:17 am

hello All

Re seyfert Galaxies

http://antwrp.gsfc.nasa.gov/apod/ap981023.html

This might resemble a fried egg you've had for breakfast, but it's actually much larger. In fact, ringed by blue-tinted star forming regions and faintly visible spiral arms, the yolk-yellow center of this face-on spiral galaxy, NGC 7742, is about 3,000 light-years across. About 72 million light-years away in the constellation Pegasus, NGC 7742 is known to be a Seyfert galaxy - a type of active spiral galaxy with a center or nucleus which is very bright at visible wavelengths. Across the spectrum, the tremendous brightness of Seyferts can change over periods of just days to months and galaxies like NGC 7742 are suspected of harboring massive black holes at their cores

16 items found in APOD
http://antwrp.gsfc.nasa.gov/cgi-bin/apo ... ert+galaxy

more info
http://arxiv.org/abs/astro-ph/0406553
http://www.astro.umd.edu/education/astr ... yfert.html

http://www.astro.umd.edu/education/astr ... yfert.html

Image
http://antwrp.gsfc.nasa.gov/apod/ap000920.html

Chef StiX · Post by **Chef StiX** » Fri Jun 23, 2006 8:28 am

Thanks for the help. The first article harry is a bit out of my league. The Chandra x-ray observatory sent me one of those. I understand it to an extent until the complex math.

Seems everytime I try to understand seyferts ya gotta get into that stuff. Oh well. I think my question was answered so I'm gunna say yes.

harry · Post by **harry** » Sun Jun 25, 2006 4:52 am

Hello Chef

Is that a League of its own.

We have a Rugby League here in Australia ,,,,,,,,,,the land of ozzzzzz.

Sorry just joking to pass the time.