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Spiral and Seyfert Galaxies
Posted: Wed Jun 21, 2006 5:31 pm
by Chef StiX
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?
Posted: Wed Jun 21, 2006 7:06 pm
by Galactic Groove
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.
Posted: Fri Jun 23, 2006 4:17 am
by harry
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
Seyferts
Posted: Fri Jun 23, 2006 8:28 am
by Chef StiX
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.
Posted: Sun Jun 25, 2006 4:52 am
by harry
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.