Search results
Results from the WOW.Com Content Network
The Circinus Galaxy, a Type II Seyfert galaxy. Seyfert galaxies are one of the two largest groups of active galaxies, along with quasar host galaxies. They have quasar-like nuclei (very luminous sources of electromagnetic radiation that are outside of our own galaxy) with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, [1] but unlike quasars, their ...
Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
It is classified as a Type 2 Seyfert galaxy [4] and was discovered by Francis Leavenworth in 1886. [1] [7] The galactic plane is inclined at an angle of 73°, giving it an oval, nearly edge-on appearance with the major axis aligned along a position angle of 150°. [4] Seyfert galaxies such as NGC 5793 are known to house megamasers.
Pages in category "Seyfert galaxies" The following 185 pages are in this category, out of 185 total. This list may not reflect recent changes. ...
NGC 3393 has been characterised as a Seyfert galaxy, a galaxy category which features bright point-like nuclei.NGC 3393 is a type II Seyfert galaxy. Its X-ray spectrum is more consistent with a Compton-thick cold reflection source, which means that the source is hidden behind dense material, mainly gas and dust, and the X-rays observed have been reflected.
Seyfert's Sextet is a group of galaxies about 190 million light-years away [2] in the constellation Serpens. The group appears to contain six members, but one of the galaxies, NGC 6027d , is a background object (700 million light years behind the group) and another "galaxy," NGC 6027e , is actually a part of the tail from galaxy NGC 6027 .
NGC 3147 has been characterised as a Seyfert II galaxy. It is considered the best candidate to be a true type II Seyfert galaxy, [4] galaxies which feature optical/UV spectrum lacking broad emission lines due to the lack of the broad line region rather than its obscuration, since the nucleus is simultaneously seen unobscured in the X-rays.
Members of this class of objects became known as Seyfert galaxies, and they were noted to have a higher than normal surface brightness in their nuclei. NGC 3516 is believed to host a supermassive black hole whose mass is estimated to be (4.27 ± 1.46) × 10 7 M ☉ based on broad emission-line reverberation mapping [ 5 ] or 23 000 000 M ☉ as ...