NGC 613
| NGC 613 | |
|---|---|
NGC 613 imaged from the Paranal Observatory in Chile.[1] The prominent star at upper left is HD 9693.[2]
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| Observation data (J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 01h 34m 18.235s[3] |
| Declination | –29° 25′ 06.56″[3] |
| Helio radial velocity | +1,487[4] |
| Distance | 67.5 Mly (20.7 Mpc)[5] |
| Type | SBbc(rs)[6] |
| Apparent dimensions (V) | 5′.2 × 2′.6[7] |
| Apparent magnitude (V) | 10.0[7] |
NGC 613 is a barred spiral galaxy located some 67[5] million light years away in the southern constellation of Sculptor.[8] It is a candidate outlying member of the Sculptor Group, a gravitationally-bound group of galaxies.[7] This galaxy was discovered in 1798 by German-English astronomer William Herschel, then re-discovered and catalogued by Scottish astronomer James Dunlop. It was first photographed in 1912, which revealed the spiral form of the nebula.[7] During the twentieth century, radio telescope observations showed that a linear feature in the nucleus was a relatively strong source of radio emission.[9]
NGC 613 is inclined by an angle of 37° to the line of sight from the Earth along a position angle of 125°.[10] The morphological classification of NGC 613 is SBbc(rs),[6] indicating that it is a spiral galaxy with a bar across the nucleus (SB), a weak inner ring structure circling the bar (rs), and moderate to loosely wound spiral arms (bc).[11] The bar is relatively broad but irregular in profile with a position angle that varies from 115–124° and dust lanes located along the leading edges. Star formation is occurring at the ends of the bar and extending along the well-defined spiral arms. The central bulge is readily apparent, with a radius of 14″.[10]
The classification of the nucleus is of type HII, indicating a match to the spectrum of an H II region. Near the core, the stars have a velocity dispersion of 136 ± 20 km/s. The nucleus is a source of radio emission with the form of an inner ring with a radius of about 1,100 ly (350 pc) and a linear feature that is perhaps perpendicular to it. The latter consists of three discrete blobs spanning approximately 2,000 ly (600 pc).[12] Observations suggest the presence of a supermassive black hole at the core with a mass in the range (1.9–9.6) × 107 times the mass of the Sun.[6]
Gallery
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A spiral galaxy’s brights and darks.jpg
NGC 613 image from Hubble Space Telescope.[13]
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NGC613 Galaxy from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block.jpg
Broadband image from the Mount Lemmon SkyCenter using the 0.8m Schulman Telescope
References
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External links
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Wikimedia Commons has media related to Lua error in package.lua at line 80: module 'strict' not found.. |
- NGC 613 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
