by Ann » Sat Mar 17, 2012 7:19 pm
neufer wrote: http://en.wikipedia.org/wiki/NGC_2683 wrote:
<<NGC 2683 is an unbarred spiral galaxy discovered by William Herschel on February 5, 1788. It was nicknamed the "UFO Galaxy" by the Astronaut Memorial Planetarium and Observatory. It is viewed nearly edge-on from Earth's location in space and is located between 16 to 25 million light-years away. It is receding from Earth at 410 km/s, and from the Galactic Center at 375 km/s.
The reddened light from the center of the galaxy appears yellowish due to the intervening gas and dust located within the outer arms of NGC 2683.>>
Shouldn't that be:
The yellowish light from the center of the galaxy appears reddened due to the intervening gas and dust located within the outer arms of NGC 2683 
I don't know. The overall color index of NGC 2683 is yellow, but not extraordinarily so. Its B-V index is 0.89, slightly paler than Pollux. Pollux, of course, is is sufficiently pale that most people would consider an artificial indoor light source with the color temperature of Pollux to be unpleasantly blue-white.
The reddening profile of NGC 2683 is interesting, however. The most reddened part appears to be where the dust lane is seen in front of the brightest part of the bulge. The light that reaches us from this part of the dust lane is strikingly orange. On the other hand, if our own galaxy had been seen from the same perspective, the dust lane almost certainly wouldn't have looked orange, but dark brown or black.
There is clearly a lot more dust in the Milky Way than in NGC 2683.
Ann
[quote="neufer"][quote=" http://en.wikipedia.org/wiki/NGC_2683"]
<<NGC 2683 is an unbarred spiral galaxy discovered by William Herschel on February 5, 1788. It was nicknamed the "UFO Galaxy" by the Astronaut Memorial Planetarium and Observatory. It is viewed nearly edge-on from Earth's location in space and is located between 16 to 25 million light-years away. It is receding from Earth at 410 km/s, and from the Galactic Center at 375 km/s.
[size=135][b][color=#FF0000]The reddened light from the center of the galaxy appears yellowish due to the intervening gas and dust located within the outer arms of NGC 2683.[/color][/b][/size]>>[/quote]
Shouldn't that be: [size=135][b][color=#0000FF]The yellowish light from the center of the galaxy appears reddened due to the intervening gas and dust located within the outer arms of NGC 2683[/color][/b][/size] :?:[/quote]
I don't know. The overall color index of NGC 2683 is yellow, but not extraordinarily so. Its B-V index is 0.89, slightly paler than Pollux. Pollux, of course, is is sufficiently pale that most people would consider an artificial indoor light source with the color temperature of Pollux to be unpleasantly blue-white.
The reddening profile of NGC 2683 is interesting, however. The most reddened part appears to be where the dust lane is seen in front of the brightest part of the bulge. The light that reaches us from this part of the dust lane is strikingly orange. On the other hand, if our own galaxy had been seen from the same perspective, the dust lane almost certainly wouldn't have looked orange, but dark brown or black.
There is clearly a lot more dust in the Milky Way than in NGC 2683.
Ann