NGC 7742

NGC 7742 is a galaxy in the constellation Pegasus.

It is 72 million light years away. With a diameter of 36,000 light years, it is relatively small. Their apparent brightness is 11.6 like, that is you need very good instruments for observation. She is a Seyfert galaxy of type 2 Due to their appearance they are also called the " Fried Egg Galaxy ". Has (from inside outwards) the following structure:

• In the center of this galaxy, the scientists suspect a black hole.
• All around is a very bright nucleus and a dust belt in about 2000 light years distance.
• In the following bluish region ( about 3200 light-years ) results in very many stars.
• Followed by a further dust belt with a substantially lower density than the first.
• Only outside of the second dust belt, there are spiral arms, as they are known from normal spiral galaxies.

NGC 7742 has a so-called " active core ", ie the black hole accretes ( " eaten " ) mass from its surroundings. These nuclei are characterized by an extreme brightness, which can quite easily reach ten thousand times a normal core. To the black hole around is possibly an annular unobservable dust accumulation. Therefore, radiation can escape only in the axial direction and ionize surrounding gas. That would mean that NGC 7742 appears likely the only reason why so bright because we happened to find ourselves exactly on this axis.

Discovery

The galaxy NGC 7742 was discovered on October 18, 1784 by the German - British astronomer William Herschel.