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- Q720375 subject Q1031119.
- Q720375 subject Q7215991.
- Q720375 subject Q7282683.
- Q720375 subject Q9990221.
- Q720375 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, indicating it is low in hydrogen. The distribution of hydrogen 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".".
- Q720375 thumbnail NGC_4921_by_HST.jpg?width=300.
- Q720375 wikiPageWikiLink Q1031119.
- Q720375 wikiPageWikiLink Q1073340.
- Q720375 wikiPageWikiLink Q1354016.
- Q720375 wikiPageWikiLink Q1406191.
- Q720375 wikiPageWikiLink Q14534.
- Q720375 wikiPageWikiLink Q1479861.
- Q720375 wikiPageWikiLink Q191684.
- Q720375 wikiPageWikiLink Q2488.
- Q720375 wikiPageWikiLink Q2490.
- Q720375 wikiPageWikiLink Q2703.
- Q720375 wikiPageWikiLink Q3937.
- Q720375 wikiPageWikiLink Q4169.
- Q720375 wikiPageWikiLink Q49957.
- Q720375 wikiPageWikiLink Q531.
- Q720375 wikiPageWikiLink Q556.
- Q720375 wikiPageWikiLink Q584905.
- Q720375 wikiPageWikiLink Q615925.
- Q720375 wikiPageWikiLink Q7215991.
- Q720375 wikiPageWikiLink Q7282683.
- Q720375 wikiPageWikiLink Q870674.
- Q720375 wikiPageWikiLink Q8963332.
- Q720375 wikiPageWikiLink Q9285.
- Q720375 wikiPageWikiLink Q9990221.
- Q720375 name "NGC 4921".
- Q720375 names "NGC 4921, UGC 08134, PGC 044899.".
- Q720375 type Place.
- Q720375 type CelestialBody.
- Q720375 type Galaxy.
- Q720375 type Location.
- Q720375 type Place.
- Q720375 type Thing.
- Q720375 type Q318.
- Q720375 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.".
- Q720375 label "NGC 4921".
- Q720375 depiction NGC_4921_by_HST.jpg.
- Q720375 name "NGC 4921".
- Q720375 name "NGC4921,UGC08134,PGC044899.".