NGC 1808

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NGC 1808
NGC 1808HSTFull.jpg
A Hubble Space Telescope (HST) image of NGC 1808 taken using WFPC2. [1]
Observation data (J2000 epoch)
Constellation Columba [2]
Right ascension 05h 07m 42.343s [3]
Declination −37° 30′ 46.98″ [3]
Redshift 995 [4]
Distance 41.7 ± 3.9  Mly (12.8 ± 1.2  Mpc) [5]
Group or cluster Dorado Group
Apparent magnitude  (V)9.94 [6]
Apparent magnitude  (B)10.83 [4]
Absolute magnitude  (B)−20.17 [7]
Characteristics
Type (R)SAB(s)a [7]
Apparent size  (V)7′.41 × 3′.39 [8]
Other designations
PGC 16779 [9]

NGC 1808 is a barred spiral galaxy [5] located in the southern constellation of Columba, about two degrees to the south and east of Gamma Caeli. [2] It was discovered by Scottish astronomer James Dunlop, who described it as a "faint nebula". [10] The galaxy is a member of the NGC 1808 group, which is part of the larger Dorado Group. [10]

The morphological classification of this galaxy is (R)SAB(s)a, [7] which indicates a spiral galaxy with a weak-bar around the nucleus (SAB), no ring around the bar (s), an outer ring (R), and tightly-wound spiral arms (a). It is inclined by an angle of 57° to the line of sight from the Earth, with the long axis oriented at a position angle of 324°. [5] The disk of gas and stars shows a noticeable warp, and there is a pronounced asymmetry in the distribution of neutral hydrogen and H II regions. [11]

The core region contains a suspected weak active galactic nucleus plus a circumnuclear ring containing star clusters and supernova remnants at a distance of ~280 pc from the center. These form a ring of peculiar "hot spots". [12] It was formerly identified as a possible Seyfert galaxy, [5] but evidence now points to starburst activity in a ~500 pc radius around the center. [13] A probable outflow of gas is directed to the north-east from the nucleus, forming prominent dust lanes. [5] The high level of star formation in this galaxy and the nearby NGC 1792 may indicate a recent, distant tidal interaction between the two. [11]

The type Ia supernova SN 1993af was discovered in November 1993 at 220″ east and 94″ north of the galactic nucleus. [14] [15]

A Hubble Space Telescope image of the center of NGC 1808. Credit: HST/NASA/ESA. NGC 1808HSTCenter.jpg
A Hubble Space Telescope image of the center of NGC 1808. Credit: HST/NASA/ESA.

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<span class="mw-page-title-main">NGC 1792</span> Galaxy in the constellation Columba

NGC 1792 is a spiral galaxy located in the southern Columba constellation. It was discovered by Scottish astronomer James Dunlop on October 4, 1826. This galaxy is located at a distance of about 36.4 million light-years and is receding from the Milky Way with a heliocentric radial velocity of 1,208 km/s. NGC 1792 is a member of the NGC 1808 cluster of galaxies.

<span class="mw-page-title-main">NGC 3862</span> Galaxy in the constellation Leo

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<span class="mw-page-title-main">NGC 4424</span> Spiral galaxy in the constellation Virgo

NGC 4424 is a spiral galaxy located in the equatorial constellation of Virgo. It was discovered February 27, 1865 by German astronomer Heinrich Louis d'Arrest. This galaxy is located at a distance of 13.5 million light years and is receding with a heliocentric radial velocity of 442 km/s. It has a morphological class of SB(s)a, which normally indicates a spiral galaxy with a barred structure (SB), no inner ring feature (s), and tightly-wound spiral arms (a). The galactic plane is inclined at an angle of 62° to the line of sight from the Earth. It is a likely member of the Virgo Cluster of galaxies.

<span class="mw-page-title-main">NGC 2865</span> Galaxy in the constellation Hydra

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<span class="mw-page-title-main">NGC 6951</span> Galaxy in the constellation Cepheus

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<span class="mw-page-title-main">NGC 5728</span> Spiral galaxy in the constellation Libra

NGC 5728 is an active barred spiral galaxy located 146 million light years away in the southern constellation of Libra. It was discovered on May 7, 1787 by William Herschel. The designation comes from the New General Catalogue of J. L. E. Dreyer, published in 1888. It has an apparent visual magnitude of 13.40 and spans an angle of 3.4 arcminutes. The galaxy shows a red shift of 0.00935 and has a heliocentric radial velocity of 2,803 km/s. It has an estimated mass of 72 billion times the mass of the Sun and stretches around 30 kpc across.

<span class="mw-page-title-main">NGC 4123</span> Galaxy in the constellation Virgo

NGC 4123 is a modest-sized, strongly-barred spiral galaxy located 75 million light-years away in the equatorial constellation of Virgo. It was discovered February 25, 1784 by William Herschel. This is a member of the Virgo cluster, and it belongs to a group of three galaxies. A companion galaxy, NGC 4116, lies at an angular separation of 14′ to the southwest. There is no indication of an interaction between the two galaxies. The third member of the group is NGC 4179.

<span class="mw-page-title-main">NGC 3786</span> Galaxy in the constellation Ursa Major

NGC 3786 is an intermediate spiral galaxy located 107.5 million light-years away in the northern constellation of Ursa Major. It was discovered by English astronomer John Herschel on April 10, 1831. This object appears to form a close pair with its peculiar neighbor to the north, NGC 3788. They show some indications of interaction, such as minor distortion of the disk or tidal features.

References

  1. ↑ "HubbleSite - NewsCenter - Hubble Captures the Heart of Star Birth" . Retrieved 2007-04-05.
  2. 1 2 Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1. Sky Publishing Corporation and the European Space Agency. ISBN   0-933346-84-0.
  3. 1 2 Skrutskie, Michael F.; et al. (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi: 10.1086/498708 . ISSN   0004-6256. S2CID   18913331.
  4. 1 2 Tully, R. Brent; et al. (August 2016). "Cosmicflows-3". The Astronomical Journal. 152 (2): 21. arXiv: 1605.01765 . Bibcode:2016AJ....152...50T. doi: 10.3847/0004-6256/152/2/50 . S2CID   250737862. 50.
  5. 1 2 3 4 5 Busch, Gerold; et al. (February 2017). "Star formation and gas flows in the centre of the NUGA galaxy NGC 1808 observed with SINFONI". Astronomy & Astrophysics. 598: 19. arXiv: 1611.07868 . Bibcode:2017A&A...598A..55B. doi:10.1051/0004-6361/201629440. S2CID   118950569. A55.
  6. ↑ Armando, Gil de Paz; et al. (2007). "The GALEX Ultraviolet Atlas of Nearby Galaxies". Astrophysical Journal . 173 (2): 185–255. arXiv: astro-ph/0606440 . Bibcode:2007ApJS..173..185G. doi:10.1086/516636. S2CID   119085482.
  7. 1 2 3 Erwin, Peter; Debattista, Victor P. (June 2013). "Peanuts at an angle: detecting and measuring the three-dimensional structure of bars in moderately inclined galaxies". Monthly Notices of the Royal Astronomical Society . 431 (4): 3060–3086. arXiv: 1301.0638 . Bibcode:2013MNRAS.431.3060E. doi:10.1093/mnras/stt385.
  8. ↑ Paturel, G.; et al. (December 2003). "HYPERLEDA. I. Identification and designation of galaxies". Astronomy and Astrophysics. 412: 45–55. Bibcode:2003A&A...412...45P. doi: 10.1051/0004-6361:20031411 .
  9. ↑ "NASA/IPAC Extragalactic Database". Results for NGC 1808. Retrieved 2007-04-05.
  10. 1 2 O'Meara, Stephen James (2013), Deep-Sky Companions: Southern Gems, Cambridge University Press, p. 116, Bibcode:2013dcsg.book.....O, ISBN   978-1107015012
  11. 1 2 Dahlem, M.; et al. (July 2001). "A search for intergalactic H I gas in the NGC 1808 group of galaxies". Astronomy and Astrophysics. 373 (2): 485–493. arXiv: astro-ph/0106050 . Bibcode:2001A&A...373..485D. doi:10.1051/0004-6361:20010614. S2CID   15512721.
  12. ↑ Salak, Dragan; et al. (May 2016). "Gas Dynamics and Outflow in the Barred Starburst Galaxy NGC 1808 Revealed with ALMA". The Astrophysical Journal. 823 (1): 28. arXiv: 1603.05881 . Bibcode:2016ApJ...823...68S. doi: 10.3847/0004-637X/823/1/68 . S2CID   118634377. 68.
  13. ↑ Salak, Dragan; et al. (November 2017). "Evolution of Molecular Clouds in the Superwind Galaxy NGC 1808 Probed by ALMA Observations". The Astrophysical Journal. 849 (2): 20. arXiv: 1710.01829 . Bibcode:2017ApJ...849...90S. doi: 10.3847/1538-4357/aa91cb . S2CID   119456694. 90.
  14. ↑ Hamuy, M.; et al. (November 1993). Green, D. W. E. (ed.). "Supernovae 1993af, 1993ag, 1993ah". IAU Circular. 5895: 1. Bibcode:1993IAUC.5895....1H.
  15. ↑ Hamuy, M.; et al. (December 1996). "BVRI Light Curves for 29 Type IA Supernovae". Astronomical Journal. 112: 2408. arXiv: astro-ph/9609064 . Bibcode:1996AJ....112.2408H. doi:10.1086/118192. S2CID   119520520.
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