NGC 1637

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Template:Short description Template:Sky Template:Infobox Galaxy

NGC 1637 is an isolated, non-interacting[1] intermediate spiral galaxy in the constellation Eridanus, about a degree to the WNW of the star Mu Eridani.[2] It was discovered by German-British astronomer William Herschel on 1 February 1786.[3] It is located at a distance of about Script error: No such module "convert". from the Milky Way.[4] The galaxy is inclined at an angle of 31.1° to the line of sight from the Earth and the long axis is oriented along a position angle of 16.3°.[4]

In 1991, Gérard de Vaucouleurs and associates assigned a morphological classification of SAB(rs)c to NGC 1637, indicating a spiral galaxy with a weak bar structure (SAB) across the nucleus, surrounded by a partial ring (rs) and somewhat loosely-wound arms (c).[1] While the inner section of the galaxy shows a symmetrical two-arm structure,[5] it has a single outer spiral arm that wraps 180° around the nucleus,[5] giving the galaxy an overall asymmetric, lopsided appearance.[1] The outer spiral arm has a red component that indicates a significant age.[5] However, the existence of this structure is difficult to explain.[1] The galaxy shows indications of recent starburst activity that may have terminated around 15 million years ago.[5]

The active central nucleus shows weak LINER behavior, and it may be an intermediate form between a LINER and an H II region.[1] The luminosity of the X-ray source at the nucleus is Script error: No such module "val". in the 0.3–7 keV band.[5]

Supernova

One supernova has been observed in NGC 1637. SN 1999em (type II-P, mag. 13.5) was discovered by the Lick Observatory Supernova Search (LOSS) on 29 October 1999, at an angular separation of Script error: No such module "val". to the southwest of the galaxy center.[6][7] It was the brightest supernova discovered that year, reaching magnitude 13.1.[8] The location corresponds to a deprojected galactocentric separation of Script error: No such module "convert"..[4]

Image and Video Gallery

See also

References

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External links

Template:Astronomical catalogs Template:Ngc20 Template:Eridanus (constellation)

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