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- NGC_4921 abstract "NGC 4921 is a barred spiral galaxy in the Coma Cluster, located in the constellation Coma Berenices. It is about 320 million light-years from Earth. The galaxy has a nucleus with a bar structure that is surrounded by a distinct ring of dust that contains recently formed, hot blue stars. The outer part consists of unusually smooth, poorly distinguished spiral arms.In 1976, Canadian astronomer Sidney Van den Bergh categorized this galaxy as "anemic" because of the low rate at which stars are being formed. He noted that it has "an unusually low surface brightness and exhibits remarkably diffuse spiral arms". Nonetheless, it is the brightest spiral galaxy in the coma cluster. This galaxy is located near the center of the cluster and has a high relative velocity (7,560 km/s) compared to the mean cluster velocity. When examined at the 21 cm wavelength Hydrogen line, NGC 4921 was found to be strongly H I deficient, which means it is low in non-ionized hydrogen gas. The distribution of the gas has also been deeply perturbed toward the SE spiral arm and is less extended than the optical disk of the galaxy. This may have been caused by interaction with the intergalactic medium, which is stripping off the gas.On May 4, 1959, a supernova explosion was observed in this galaxy by M. L. Humason using a Schmidt telescope at the Palomar Observatory. It appeared "quite far from the center" of the galaxy, and reached an estimated peak magnitude of 18.5. The light curve proved similar to supernova SN 1987a in the Large Magellanic Cloud, and it displayed "unusual photometric behavior".".
- NGC_4921 thumbnail NGC_4921_by_HST.jpg?width=300.
- NGC_4921 wikiPageID "21409016".
- NGC_4921 wikiPageRevisionID "604847454".
- NGC_4921 appmagV "13.04".
- NGC_4921 caption "NGC 4921 in a combination of near-infrared and yellow light.".
- NGC_4921 constellationName Coma_Berenices.
- NGC_4921 distLy "ca. 320 Mly".
- NGC_4921 epoch Epoch_(astronomy).
- NGC_4921 hasPhotoCollection NGC_4921.
- NGC_4921 name "NGC 4921".
- NGC_4921 names "NGC 4921, UGC 08134, PGC 044899.".
- NGC_4921 sizeV "2.5".
- NGC_4921 type "SBab".
- NGC_4921 z "0.018286".
- NGC_4921 subject Category:Barred_spiral_galaxies.
- NGC_4921 subject Category:Coma_Berenices_(constellation).
- NGC_4921 subject Category:Coma_Cluster.
- NGC_4921 subject Category:NGC_objects.
- NGC_4921 type CelestialBody.
- NGC_4921 type Galaxy.
- NGC_4921 type PhysicalBody.
- NGC_4921 comment "NGC 4921 is a barred spiral galaxy in the Coma Cluster, located in the constellation Coma Berenices. It is about 320 million light-years from Earth. The galaxy has a nucleus with a bar structure that is surrounded by a distinct ring of dust that contains recently formed, hot blue stars.".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 label "NGC 4921".
- NGC_4921 sameAs NGC_4921.
- NGC_4921 sameAs NGC_4921.
- NGC_4921 sameAs NGC_4921.
- NGC_4921 sameAs NGC_4921.
- NGC_4921 sameAs NGC_4921.
- NGC_4921 sameAs NGC_4921.
- NGC_4921 sameAs m.05f7xwd.
- NGC_4921 sameAs Q720375.
- NGC_4921 sameAs Q720375.
- NGC_4921 wasDerivedFrom NGC_4921?oldid=604847454.
- NGC_4921 depiction NGC_4921_by_HST.jpg.
- NGC_4921 isPrimaryTopicOf NGC_4921.
- NGC_4921 name "NGC 4921".
- NGC_4921 name "NGC 4921, UGC 08134, PGC 044899.".