NGC 3621
| NGC 3621 | |
|---|---|
 NGC 3621 taken by the Wide Field Imager (WFI) at ESO's La Silla Observatory | |
| Observation data (J2000 epoch) | |
| Constellation | Hydra |
| Right ascension | 11h 18m 16.5109s[1] |
| Declination | –32° 48′ 49.732″[1] |
| Redshift | 0.002403[1] |
| Heliocentric radial velocity | 720 ± 0 km/s[1] |
| Distance | 21.7 million light years (6.64 Mpc)[2] |
| Apparent magnitude (V) | 9.56[3] |
| Characteristics | |
| Type | SA(s)d[4] |
| Mass | 2 × 1010[4] M☉ |
| Size | ~216,900 ly (66.49 kpc) (estimated)[1] |
| Apparent size (V) | 10.96′ × 4.79′[3] |
| Other designations | |
| ESO 377- G 037, IRAS 11158-3232, UGCA 232, MCG -05-27-008, PGC 34554[3][1] | |
NGC 3621 is a field spiral galaxy about 22 Mly (6.7 Mpc) away[2][5] in the equatorial constellation of Hydra. It was discovered by German-British astronomer William Herschel on 17 February 1790.[6]
NGC 3621 is comparatively bright and can be well seen in moderate-sized telescopes. The galaxy is around 216,900 ly (66,500 pc)[1] across and is inclined at an angle of 66° from being viewed face on.[7] It shines with a luminosity equal to 13 billion times that of the Sun.[8] The morphological classification is SA(s)d,[4] which indicates this is an ordinary spiral with loosely wound arms.[9] There is no evidence for a bulge.[10] Although it appears to be isolated,[9] NGC 3621 belongs to the Leo spur.[8]
This galaxy has an active nucleus that matches a Seyfert 2 optical spectrum, suggesting that a low mass supermassive black hole is present at the core. Based upon the motion of stars in the nucleus, this object may have a mass of up to three million times the mass of the Sun.[10]
Supernova
[edit]One supernova has been observed in NGC 3621: SN 2024ggi (type II, mag. 18.915) was discovered by ATLAS on 11 April 2024,[11] and by 16 April it had brightened to magnitude 12. It got as bright as magnitude 11.9, making it the brightest supernova of 2024.[12] It was the closest supernova to Earth since SN 2023ixf, which had been discovered on 19 May 2023. A search of archival Hubble Space Telescope and Spitzer Space Telescope images showed the suspected progenitor star, identified as a red supergiant.[13]
Gallery
[edit]-
![Part of NGC 3621 imaged by HST.[14]](https://images.weserv.nl/?url=%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2Fa%2Fa7%2FNGC_3621_HST.jpg%2F120px-NGC_3621_HST.jpg&q=12&output=webp&max-age=110)
-
![Very Large Telescope image of NGC 3621.[15]](https://images.weserv.nl/?url=%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F9%2F9e%2FNGC_3621_ESO_VLT.jpg%2F120px-NGC_3621_ESO_VLT.jpg&q=12&output=webp&max-age=110)
Very Large Telescope image of NGC 3621.[15] -
NGC 3621 by Hubble Space Telescope -
NGC 3621 by GALEX -
Spitzer Space Telescope image of NGC 3621. -
NGC 3621 (HST)
![Part of NGC 3621 imaged by HST.[14]](http://clevelandohioweatherforecast.com//pFad.php?u=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FFile%3ANGC_3621_HST.jpg)
![Very Large Telescope image of NGC 3621.[15]](http://clevelandohioweatherforecast.com//pFad.php?u=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FFile%3ANGC_3621_ESO_VLT.jpg)
See also
[edit]References
[edit]- ^ a b c d e f g "Results for object NGC 3621". NASA/IPAC Extragalactic Database. NASA and Caltech. Retrieved 5 December 2024.
- ^ a b Tully, R. Brent; et al. (March 2008), "Our Peculiar Motion Away from the Local Void", The Astrophysical Journal, 676 (1): 184–205, arXiv:0705.4139, Bibcode:2008ApJ...676..184T, doi:10.1086/527428, S2CID 14738309.
- ^ a b c "NGC 3621". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-24.
- ^ a b c Bresolin, Fabio; Kennicutt, Robert C.; Ryan-Weber, Emma (May 2012), "Gas Metallicities in the Extended Disks of NGC 1512 and NGC 3621. Chemical Signatures of Metal Mixing or Enriched Gas Accretion?", The Astronomical Journal, 750 (2): 122, arXiv:1203.0956, Bibcode:2012ApJ...750..122B, doi:10.1088/0004-637X/750/2/122, S2CID 118616035.
- ^ Materne, J. (April 1979). "The structure of nearby groups of galaxies - Quantitative membership probabilities". Astronomy and Astrophysics. 74 (2): 235–243. Bibcode:1979A&A....74..235M.
- ^ Seligman, Courtney. "New General Catalogue Objects: NGC 3621". Celestial Atlas. Retrieved 5 December 2024.
- ^ Lang, Philipp (July 2020), "PHANGS CO Kinematics: Disk Orientations and Rotation Curves at 150 pc Resolution", The Astrophysical Journal, 897 (2): 122, arXiv:2005.11709, Bibcode:2020ApJ...897..122L, doi:10.3847/1538-4357/ab9953.
- ^ a b O'Meara, Stephen James (2013), Deep-Sky Companions: Southern Gems, Cambridge University Press, p. 203, Bibcode:2013dcsg.book.....O, ISBN 978-1107015012.
- ^ a b Buta, Ronald J.; Corwin, Harold G.; Odewahn, Stephen C. (2007), Atlas of Galaxies, Cambridge University Press, pp. 13–17, ISBN 978-0521820486.
- ^ a b Barth, Aaron J.; Strigari, Louis E.; Bentz, Misty C.; Greene, Jenny E.; Ho, Luis C. (January 2009), "Dynamical Constraints on the Masses of the Nuclear Star Cluster and Black Hole in the Late-Type Spiral Galaxy NGC 3621", The Astronomical Journal, 690 (1): 1031–1044, arXiv:0809.1066, Bibcode:2009ApJ...690.1031B, doi:10.1088/0004-637X/690/1/1031, S2CID 12574940.
- ^ "SN 2024ggi". Transient Name Server. IAU. Retrieved 4 December 2024.
- ^ Bishop, David. "Bright Supernovae - 2024". Rochester Astronomy. Retrieved 31 December 2024.
- ^ Xiang, Danfeng; Mo, Jun; Wang, Xiaofeng; Wang, Lingzhi; Zhang, Jujia; Lin, Han; Chen, Liyang; Song, Cuiying; Liu, Liang-Duan; Wang, Zhenyu; Li, Gaici (2024). "The Red Supergiant Progenitor of Type II Supernova 2024ggi". The Astrophysical Journal. 969 (1): L15. arXiv:2405.07699. Bibcode:2024ApJ...969L..15X. doi:10.3847/2041-8213/ad54b3.
- ^ "A special spiral galaxy for over 200 000 Facebook fans". Hubble Space Telescope – Picture of the Week. Retrieved 23 January 2020.
- ^ "A galaxy full of surprises — NGC 3621 is bulgeless but has three central black holes". European Southern Observatory – Picture of the Week. Retrieved 23 January 2020.
External links
[edit]
- A Picture-perfect Pure-disc Galaxy — ESO Photo release.
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