NGC 4526
Template:Short description Template:Infobox Galaxy
NGC 4526 (also listed as NGC 4560) is a lenticular galaxy with an embedded dusty disc, located approximately 55 million light-years from the Solar System[1] in the Virgo constellation and discovered on 13 April 1784 by William Herschel.[2] Herschel observed it again on 28 December 1785, resulting in the galaxy being entered twice into the New General Catalogue.[2]
The galaxy is seen nearly edge-on. The morphological classification is SAB(s)0°,[3] which indicates a lenticular structure with a weak bar across the center and pure spiral arms without a ring.[4] It belongs to the Virgo cluster and is one of the brightest known lenticular galaxies.[3] In the galaxy's outer halo, globular cluster orbital velocities[5] indicate abnormal poverty of dark matter: only 43±18% of the mass within 5 effective radii.
The inner nucleus of this galaxy displays a rise in stellar orbital motion that indicates the presence of a central dark mass. The best fit model for the motion of molecular gas in the core region suggests there is a supermassive black hole with about Script error: No such module "val". (450 million) times the mass of the Sun.[6] This is the first object to have its black-hole mass estimated by measuring the rotation of gas molecules around its centre with an astronomical interferometer (in this case the Combined Array for Research in Millimeter-wave Astronomy).
Supernovae
Two supernovae have been observed in NGC 4526:
- SN 1969E (type unknown, mag. 16) was discovered by Enrique Chavira on 23 March 1969.[7][8]
- SN 1994D (Type Ia, mag. 15.2) was discovered independently by the Leuschner Observatory Supernova Search and by Dr. M. Richmond, on 7 March 1994, about two weeks before reaching peak brightness.[9] It was caused by the explosion of a white dwarf star composed of carbon and oxygen.[10]
See also
References
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External links
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