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">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

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

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

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

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

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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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