NGC 2841
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NGC 2841 is an unbarred spiral galaxy in the northern circumpolar constellation of Ursa Major. It was discovered on 9 March, 1788 by German-born astronomer William Herschel. J. L. E. Dreyer, the author of the New General Catalogue, described it as, "very bright, large, very much extended 151°, very suddenly much brighter middle equal to 10th magnitude star".[1] Initially thought to be about 30 million light-years distant, a 2001 Hubble Space Telescope survey of the galaxy's Cepheid variables determined its distance to be approximately 14.1 megaparsecs or 46 million light-years.[2] The optical size of the galaxy is 8.1Template:Prime × 3.5Template:Prime.[3]
This is the prototype for the flocculent spiral galaxy,[4] a type of spiral galaxy whose arms are patchy and discontinuous.[5] The morphological class is SAa, indicating a spiral galaxy with no central bar and very tightly-wound arms. There is no grand design structure visible in the optical band, although some inner spiral arms can be seen in the near infrared.[4] It is inclined by an angle of 68° to the line of sight from the Earth, with the major axis aligned along a position angle of 148°.[4]
The properties of NGC 2841 are similar to those of the Andromeda Galaxy.[2] It is home to a large population of young blue stars, and a few H II regions.[6] The luminosity of the galaxy is Script error: No such module "val". and it has a combined mass of Script error: No such module "val"..[3] Its disk of stars can be traced out to a radius of around Script error: No such module "convert".. This disk begins to warp at a radius of around Script error: No such module "convert"., suggesting the perturbing effect of in-falling matter from the surrounding medium.[4]
The rotational behavior of the galaxy suggests there is a massive nuclear bulge,[3] with a low-ionization nuclear emission-line region (LINER) at the core; a type of region that is characterized by spectral line emission from weakly ionized atoms.[7] A prominent molecular ring is orbiting at a radius of Script error: No such module "convert"., which is providing a star-forming region of gas and dust.[3] The nucleus appears decoupled and there is a counter-rotating element of stars and gas in the outer parts of the nucleus, suggesting a recent interaction with a smaller galaxy.[3]
Supernovae
Four supernovae have been observed in NGC 2841.
- SN 1912A (type Ia, mag. 13) was discovered by Heber Curtis and Francis Pease on 19 February 1912.[8][9]
- SN 1957A (type Ia-pec, mag. 14) was discovered by Max Schürer on 1 March 1957.[10][11] [Note: some sources incorrectly list the discovery date as 26 February 1957.]
- SN 1972R (type unknown, mag. 16) was discovered by Paul Wild on 5 December 1972.[12]
- SN 1999by (type Ia-pec, mag. 15) was codiscovered by Ron Arbour, and the Lick Observatory Supernova Search, on 30 April 1999.[13][14]
See also
References
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External links
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- Unbarred spiral galaxies
- Flocculent spiral galaxies
- LINER galaxies
- Ursa Major
- NGC objects
- UGC objects
- Principal Galaxies Catalogue objects
- Astronomical objects discovered in 1788
- Discoveries by William Herschel
- IRAS catalogue objects
- MCG objects