NGC 1705

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NGC 1705
NGC1705 - HST - Potw2205a.jpg
NGC 1705. Credit: NASA.
Observation data (J2000 epoch)
Constellation Pictor
Right ascension 04h 54m 13.500s [1]
Declination −53° 21′ 39.82″ [1]
Redshift 633 ± 6 km/s [2]
Distance 16.6 ± 2.0  Mly (5.1 ± 0.6  Mpc) [3]
Group or cluster Dorado Group
Apparent magnitude  (V)12.56±0.03 [4]
Characteristics
Type SA0− pec [2] or BCD [3]
Apparent size  (V)1′.86 × 1′.45 [5]
Other designations
PGC 16282 [2]

NGC 1705 is a peculiar lenticular galaxy and a blue compact dwarf galaxy (BCD) [3] in the southern constellation of Pictor, positioned less than a degree to the east of Iota Pictoris, [6] and is undergoing a starburst. [7] With an apparent visual magnitude of 12.6 [4] it requires a telescope to observe. It is estimated to be approximately 17 million light-years from the Earth, [8] and is a member of the Dorado Group. [9]

This is a relatively isolated galaxy, with its nearest neighbors being more than 500  kpc distant. However, its neutral hydrogen disk shows a significant amount of warp, suggesting that the outer gas is still settling into place. [3] The mass models of the galaxy suggest the dominant source of mass is a dark matter halo. [10] It has a super star cluster located near the galactic center, [10] and shows strong galactic winds. [3] Designated NGC1750–1, this cluster has a maximum radius of 2.85±0.50 pc and is 12±6 Myr old. [11]

The major starburst activity is happening at the core of the galaxy, within the central ~150 pc, and this is providing the main ionizing source out to distance of ~1 kpc or more. [7] Over the last 10 million years it has added 5.7×105  M☉ worth of stars. [3] The younger stars in the galaxy with an age below a billion years have an estimated 6×107 M☉ and are mainly concentrated near the center, while the older star populations have 2.2×108 M☉ and form a more extended distribution. The total mass of neutral hydrogen in the galaxy is estimated at (2.2±0.2)×108 M☉. [10]

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<span class="mw-page-title-main">Messier 60</span> Elliptical galaxy in the constellation Virgo

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<span class="mw-page-title-main">NGC 2903</span> Spiral galaxy in the constellation Leo

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<span class="mw-page-title-main">NGC 4194</span> Interacting galaxy pair in the constellation of Ursa Major

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<span class="mw-page-title-main">NGC 4449</span> Galaxy in the constellation Canes Venatici

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<span class="mw-page-title-main">NGC 4666</span> Spiral galaxy in the constellation Virgo

NGC 4666 is a spiral galaxy in the equatorial constellation of Virgo, located at a distance of approximately 55 megalight-years from the Milky Way. It was discovered by the German-born astronomer William Herschel on February 22, 1784. It is a member of the Virgo II Groups, a series of galaxies and galaxy clusters strung out from the southern edge of the Virgo Supercluster. John L. E. Dreyer described it as "bright, very large, much extended 45°±, pretty suddenly brighter middle". It is a member of an interacting system with NGC 4668 and a dwarf galaxy, and belongs to a small group that also includes NGC 4632.

<span class="mw-page-title-main">NGC 922</span> Peculiar galaxy in the constellation Fornax

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<span class="mw-page-title-main">NGC 4203</span> Galaxy in the constellation Coma Berenices

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

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<span class="mw-page-title-main">NGC 7552</span> Galaxy in the constellation Grus

NGC 7552 is a barred spiral galaxy in the constellation Grus. It is at a distance of roughly 60 million light years from Earth, which, given its apparent dimensions, means that NGC 7552 is about 75,000 light years across. It forms with three other spiral galaxies the Grus Quartet.

<span class="mw-page-title-main">NGC 3311</span> Galaxy in the constellation Hydra

NGC 3311 is a super-giant elliptical galaxy located about 190 million light-years away in the constellation Hydra. The galaxy was discovered by astronomer John Herschel on March 30, 1835. NGC 3311 is the brightest member of the Hydra Cluster and forms a pair with NGC 3309 which along with NGC 3311, dominate the central region of the Hydra Cluster.

<span class="mw-page-title-main">NGC 708</span> Galaxy in the constellation Andromeda

NGC 708 is an elliptical galaxy located 240 million light-years away in the constellation Andromeda and was discovered by astronomer William Herschel on September 21, 1786. It is classified as a cD galaxy and is the brightest member of Abell 262. NGC 708 is a weak FR I radio galaxy and is also classified as a type 2 Seyfert galaxy.

<span class="mw-page-title-main">NGC 541</span> Galaxy in the constellation Cetus

NGC 541 is a lenticular galaxy located in the constellation Cetus. It is located at a distance of about 230 million light years from Earth, which, given its apparent dimensions, means that NGC 541 is about 130,000 light years across. It was discovered by Heinrich d'Arrest on October 30, 1864. It is a member of the Abell 194 galaxy cluster and is included in the Atlas of Peculiar Galaxies in the category galaxies with nearby fragments. NGC 541 is a radio galaxy of Fanaroff–Riley class I, also known as 3C 40A.

<span class="mw-page-title-main">NGC 4848</span> Galaxy in the constellation Coma Berenices

NGC 4848 is a barred spiral galaxy in the constellation Coma Berenices. It is circa 340 million light-years from Earth, which, given its apparent dimensions, means that NGC 4848 is about 170,000 light years across. It was discovered by Heinrich d'Arrest on April 21, 1865. It is considered part of the Coma Cluster, which is in its northwest part. The galaxy has been stripped of its gas as it passed through the cluster.

References

  1. 1 2 Skrutskie, Michael F.; Cutri, Roc M.; Stiening, Rae; Weinberg, Martin D.; Schneider, Stephen E.; Carpenter, John M.; Beichman, Charles A.; Capps, Richard W.; Chester, Thomas; Elias, Jonathan H.; Huchra, John P.; Liebert, James W.; Lonsdale, Carol J.; Monet, David G.; Price, Stephan; Seitzer, Patrick; Jarrett, Thomas H.; Kirkpatrick, J. Davy; Gizis, John E.; Howard, Elizabeth V.; Evans, Tracey E.; Fowler, John W.; Fullmer, Linda; Hurt, Robert L.; Light, Robert M.; Kopan, Eugene L.; Marsh, Kenneth A.; McCallon, Howard L.; Tam, Robert; Van Dyk, Schuyler D.; Wheelock, Sherry L. (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.
  2. 1 2 3 "NASA/IPAC Extragalactic Database". Results for NGC 1705. Retrieved 2006-11-29.
  3. 1 2 3 4 5 6 Cignoni, M.; et al. (March 2018). "Star Formation Histories of the LEGUS Dwarf Galaxies. I. Recent History of NGC 1705, NGC 4449, and Holmberg II". The Astrophysical Journal. 856 (1): 17. arXiv: 1802.06792 . Bibcode:2018ApJ...856...62C. doi: 10.3847/1538-4357/aab041 . S2CID   119485664. 62.
  4. 1 2 Cook, David O.; et al. (2014). "Spitzer Local Volume Legacy (LVL) SEDs and physical properties". Monthly Notices of the Royal Astronomical Society. 445 (1): 899–912. arXiv: 1409.0847 . Bibcode:2014MNRAS.445..899C. doi: 10.1093/mnras/stu1787 .
  5. ↑ 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 .
  6. ↑ Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 1. Sky Publishing Corporation and the European Space Agency. p. 458. ISBN   0-933346-84-0.
  7. 1 2 Annibali, F.; et al. (November 2015). "Chemical Abundances and Properties of the Ionized Gas in NGC 1705". The Astronomical Journal. 150 (5): 23. arXiv: 1505.05545 . Bibcode:2015AJ....150..143A. doi:10.1088/0004-6256/150/5/143. S2CID   119249162. 143.
  8. ↑ Nemiroff, R. & Bonnell, J., eds. (April 23, 2003). "The Stars of NGC 1705". Astronomy Picture of the Day . NASA.
  9. ↑ Huchra, J. P.; Geller, M. J. (June 15, 1982). "Groups of galaxies. I - Nearby groups". Astrophysical Journal. 257 (Part 1): 423–437. Bibcode:1982ApJ...257..423H. doi:10.1086/160000.
  10. 1 2 3 Elson, E. C.; et al. (March 2013). "H I synthesis observations of the blue compact dwarf NGC 1705". Monthly Notices of the Royal Astronomical Society. 429 (3): 2550–2561. arXiv: 1301.2889 . Bibcode:2013MNRAS.429.2550E. doi: 10.1093/mnras/sts526 .
  11. ↑ Martins, F.; et al. (November 2012). "Near-infrared spectroscopy of the super star cluster in NGC 1705". Astronomy & Astrophysics. 547: 4. arXiv: 1209.3910 . Bibcode:2012A&A...547A..17M. doi:10.1051/0004-6361/201220144. S2CID   56159879. A17.


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