Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/NGC_5548> ?p ?o }
- NGC_5548 abstract "NGC 5548 is a well-studied Type I Seyfert galaxy with a bright, active nucleus. This activity is caused by matter flowing onto a 65 million solar mass (M☉) supermassive black hole at the core. Morphologically, this is an unbarred lenticular galaxy with tightly-wound spiral arms, while shell and tidal tail features suggest that it has undergone a cosmologically-recent merger or interaction event. NGC 5548 is approximately 245 million light years away and appears in the constellation Boötes. The apparent visual magnitude of NGC 5548 is approximately 13.3 in the V band.In 1943, this galaxy was one of twelve nebulae listed by American astronomer Carl Keenan Seyfert that showed broad emission lines in their nuclei. 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. Observation of NGC 5548 during the 1960s with radio telescopes showed an enhanced level of radio emission. Spectrograms of the nucleus made in 1966 showed that the energized region was confined to a volume a few parsecs across, where temperature were around 7004140000000000000♠14000 K and the plasma had a dispersion velocity of ±450 km/s.Among astronomers, the accepted explanation for the active nucleus in NGC 5548 is the accretion of matter onto a supermassive black hole (SMBH) at the core. This object is surrounded by an orbiting disk of accreted matter drawn in from the surroundings. As material is drawn into the outer parts of this disk, it becomes photoionized, producing broad emission lines in the optical and ultraviolet bands of the electromagnetic spectrum. A wind of ionized matter, organized in filamentary structures at distances of 1–14 light days from the center, is flowing outward in the direction perpendicular to the accretion disk plane.The mass of the central black hole can be estimated based on the properties of the emission lines in the core region. Combined measurements yield an estimated mass of 7007654000000000000♠6.54+0.26−0.25×107 M☉. In other words, it is some 65 million times the mass of the Sun. This result is consistent with other methods of estimating the mass of the SMBH in the nucleus of NGC 5548. Matter is falling onto this black hole at the estimated rate of 6998300000000000000♠0.03 M☉ per year, whereas mass is flowing outward from the core at or above the rate of 6999920000000000000♠0.92 M☉ each year. The inner part of the accretion disk surrounding the SMBH forms a thick, hot corona spanning several light hours that is emitting X-rays. When this radiation reaches the optically thick part of the accretion disk at a radius of around 1–2 light days, the X-rays are converted into heat.".
- NGC_5548 thumbnail Supermassive_black_hole_at_the_heart_of_NGC_5548.jpg?width=300.
- NGC_5548 wikiPageExternalLink 0170.
- NGC_5548 wikiPageExternalLink ngc5548.html.
- NGC_5548 wikiPageID "4277163".
- NGC_5548 wikiPageLength "14929".
- NGC_5548 wikiPageOutDegree "42".
- NGC_5548 wikiPageRevisionID "706298512".
- NGC_5548 wikiPageWikiLink Active_galactic_nucleus.
- NGC_5548 wikiPageWikiLink Apparent_magnitude.
- NGC_5548 wikiPageWikiLink Astrophysical_jet.
- NGC_5548 wikiPageWikiLink Boötes.
- NGC_5548 wikiPageWikiLink Carl_Keenan_Seyfert.
- NGC_5548 wikiPageWikiLink Category:Markarian_galaxies.
- NGC_5548 wikiPageWikiLink Category:NGC_objects.
- NGC_5548 wikiPageWikiLink Category:Seyfert_galaxies.
- NGC_5548 wikiPageWikiLink Category:Unbarred_lenticular_galaxies.
- NGC_5548 wikiPageWikiLink Corona.
- NGC_5548 wikiPageWikiLink Electromagnetic_spectrum.
- NGC_5548 wikiPageWikiLink Epoch_(astronomy).
- NGC_5548 wikiPageWikiLink Galaxy.
- NGC_5548 wikiPageWikiLink Galaxy_morphological_classification.
- NGC_5548 wikiPageWikiLink Lenticular_galaxy.
- NGC_5548 wikiPageWikiLink Light-year.
- NGC_5548 wikiPageWikiLink Markarian_galaxies.
- NGC_5548 wikiPageWikiLink Nebula.
- NGC_5548 wikiPageWikiLink New_General_Catalogue.
- NGC_5548 wikiPageWikiLink Optical_depth.
- NGC_5548 wikiPageWikiLink Parsec.
- NGC_5548 wikiPageWikiLink Photoionization.
- NGC_5548 wikiPageWikiLink Radio_astronomy.
- NGC_5548 wikiPageWikiLink Radio_telescope.
- NGC_5548 wikiPageWikiLink Seyfert_galaxy.
- NGC_5548 wikiPageWikiLink Solar_mass.
- NGC_5548 wikiPageWikiLink Spectral_line.
- NGC_5548 wikiPageWikiLink Spectrogram.
- NGC_5548 wikiPageWikiLink Spiral_galaxy.
- NGC_5548 wikiPageWikiLink Sun.
- NGC_5548 wikiPageWikiLink Supermassive_black_hole.
- NGC_5548 wikiPageWikiLink Tidal_tail.
- NGC_5548 wikiPageWikiLink UBV_photometric_system.
- NGC_5548 wikiPageWikiLink Ultraviolet.
- NGC_5548 wikiPageWikiLink Uppsala_General_Catalogue.
- NGC_5548 wikiPageWikiLink X-ray_astronomy.
- NGC_5548 wikiPageWikiLink File:Supermassive_black_hole_at_the_heart_of_NGC_5548.jpg.
- NGC_5548 wikiPageWikiLinkText "5548".
- NGC_5548 wikiPageWikiLinkText "NGC 5548".
- NGC_5548 appmagV "13.283".
- NGC_5548 caption "NGC 5548 image by Hubble.".
- NGC_5548 colwidth "24".
- NGC_5548 constellationName Boötes.
- NGC_5548 credit "ESA/Hubble and NASA. Acknowledgement: Davide de Martin.".
- NGC_5548 distLy Light-year.
- NGC_5548 distLy "244.6".
- NGC_5548 epoch Epoch_(astronomy).
- NGC_5548 hRadialV "5178.0".
- NGC_5548 name "NGC 5548".
- NGC_5548 names "Mrk 1509, UGC 9149".
- NGC_5548 notes "Seyfert galaxy; radio jet".
- NGC_5548 sizeV "1.7".
- NGC_5548 type "SA0/a pec".
- NGC_5548 wikiPageUsesTemplate Template:Citation.
- NGC_5548 wikiPageUsesTemplate Template:DEC.
- NGC_5548 wikiPageUsesTemplate Template:Infobox_galaxy.
- NGC_5548 wikiPageUsesTemplate Template:RA.
- NGC_5548 wikiPageUsesTemplate Template:Reflist.
- NGC_5548 wikiPageUsesTemplate Template:Sky.
- NGC_5548 wikiPageUsesTemplate Template:Solar_mass.
- NGC_5548 wikiPageUsesTemplate Template:Val.
- NGC_5548 wikiPageUsesTemplate Template:WikiSky.
- NGC_5548 z "0.01651".
- NGC_5548 subject Category:Markarian_galaxies.
- NGC_5548 subject Category:NGC_objects.
- NGC_5548 subject Category:Seyfert_galaxies.
- NGC_5548 subject Category:Unbarred_lenticular_galaxies.
- NGC_5548 hypernym Type.
- NGC_5548 type CelestialBody.
- NGC_5548 type Galaxy.
- NGC_5548 type Place.
- NGC_5548 type Catalogue.
- NGC_5548 type Object.
- NGC_5548 type Redirect.
- NGC_5548 type Location.
- NGC_5548 type Place.
- NGC_5548 type Thing.
- NGC_5548 type Q318.
- NGC_5548 comment "NGC 5548 is a well-studied Type I Seyfert galaxy with a bright, active nucleus. This activity is caused by matter flowing onto a 65 million solar mass (M☉) supermassive black hole at the core. Morphologically, this is an unbarred lenticular galaxy with tightly-wound spiral arms, while shell and tidal tail features suggest that it has undergone a cosmologically-recent merger or interaction event. NGC 5548 is approximately 245 million light years away and appears in the constellation Boötes.".
- NGC_5548 label "NGC 5548".
- NGC_5548 sameAs Q1120968.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs NGC_5548.
- NGC_5548 sameAs m.0btqt1.