NGC 1705 - Misplaced Pages

Galaxy in the constellation Pictor

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

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

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. The mass models of the galaxy suggest the dominant source of mass is a dark matter halo. It has a super star cluster located near the galactic center, and shows strong galactic winds. Designated NGC1750–1, this cluster has a maximum radius of 2.85±0.50 pc and is 12±6 Myr old.

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. Over the last 10 million years it has added 5.7×10 M_☉ worth of stars. The younger stars in the galaxy with an age below a billion years have an estimated 6×10 M_☉ and are mainly concentrated near the center, while the older star populations have 2.2×10 M_☉ and form a more extended distribution. The total mass of neutral hydrogen in the galaxy is estimated at (2.2±0.2)×10 M_☉.

References

^ 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.
^ "NASA/IPAC Extragalactic Database". Results for NGC 1705. Retrieved 2006-11-29.
^ 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.
^ 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.
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.
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.
^ 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.
Nemiroff, R. & Bonnell, J., eds. (April 23, 2003). "The Stars of NGC 1705". Astronomy Picture of the Day. NASA.
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.
^ 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.
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.

External links

Media related to NGC 1705 at Wikimedia Commons
NGC 1705 at ESA/Hubble
NGC 1705 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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Astronomical catalog List of NGC objects 1001–2000

New General Catalogue 1500 to 1999

Constellation of Pictor

Stars

Bayer	α β γ δ ζ η η θ ι κ λ μ ν μ Dor
Variable	R S RR SW TU TV TW TX AB AE AK VZ
HR	1498 1667 1727 1742 1813 1856 1860 1912 1984 2008 2023 2032 2044 2049 2072 2089 2094 2114 2117 2138 2274 2336 2337 2345 2354 2360 2369 2389 2562
HD	37781 40307 41004 41248
Other	2MASS J05581644–4501559 EBLM J0555-57 NGC 1995 PSR J0437−4715 TOI-270 TOI-1338 WISE 0647−6232

Exoplanets	AB Pictoris b β Pictoris b c HD 40307 b c d e f g HR 2562 B LHS 1815 b TOI-1338 b c

Galaxies

NGC	1705 1803 1998 2008
Other	Pictor A PKS 0529-549 PKS 0537-441 QSO J0529-4351