NGC 1705
Galaxy in the constellation Pictor
title: "NGC 1705" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["lenticular-galaxies", "peculiar-galaxies", "dorado-group", "pictor", "ngc-objects", "principal-galaxies-catalogue-objects"] description: "Galaxy in the constellation Pictor" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/NGC_1705" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Galaxy in the constellation Pictor ::
::data[format=table title="Infobox Galaxy"]
| Field | Value |
|---|---|
| image | NGC1705 - HST - Potw2205a.jpg |
| image_size | 250px |
| caption | NGC 1705. Credit: NASA. |
| name | NGC 1705 |
| epoch | J2000 |
| type | SA0− pec or BCD |
| ra | |
| dec | |
| group_cluster | Dorado Group |
| dist_ly | 5.1 ± |
| z | 633 ± 6 km/s |
| appmag_v | |
| size_v | 1′.86 × 1′.45 |
| constellation name | Pictor |
| names | PGC 16282 |
| :: |
| image = NGC1705 - HST - Potw2205a.jpg | image_size = 250px | caption = NGC 1705. Credit: NASA. | name = NGC 1705 | epoch = J2000 | type = SA0− pec or BCD | ra = | dec = | group_cluster = Dorado Group | dist_ly = 5.1 ± | z = 633 ± 6 km/s | appmag_v = | size_v = 1′.86 × 1′.45 | mass = | mass_light_ratio = | constellation name = Pictor | notes = | names = 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 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 and is Myr old.
The major starburst activity is happening at the core of the galaxy, within the central , and this is providing the main ionizing source out to distance of or more. Over the last 10 million years it has added worth of stars. The younger stars in the galaxy with an age below a billion years have an estimated and are mainly concentrated near the center, while the older star populations have and form a more extended distribution. The total mass of neutral hydrogen in the galaxy is estimated at .
References
| first1=Roger W. | last1=Sinnott | first2=Michael A. C. | last2=Perryman | title=Millennium Star Atlas | page=458 | volume=1 | year=1997 | isbn=0-933346-84-0 | publisher=Sky Publishing Corporation and the European Space Agency }}
| title=The Stars of NGC 1705 | date=April 23, 2003 | name-list-style=amp | access-date= }}
| title=NASA/IPAC Extragalactic Database | work=Results for NGC 1705 | url=http://nedwww.ipac.caltech.edu/ | access-date=2006-11-29}}
| last1=Huchra | first1=J. P. | last2=Geller | first2=M. J. | title=Groups of galaxies. I - Nearby groups | journal=Astrophysical Journal | issue=Part 1 | volume=257 | pages=423–437 | date=June 15, 1982 | bibcode=1982ApJ...257..423H | doi=10.1086/160000 }}
| title=Spitzer Local Volume Legacy (LVL) SEDs and physical properties | journal=Monthly Notices of the Royal Astronomical Society | last1=Cook | first1=David O. | last2=Dale | first2=Daniel A. | last3=Johnson | first3=Benjamin D. | last4=Van Zee | first4=Liese | last5=Lee | first5=Janice C. | last6=Kennicutt | first6=Robert C. | last7=Calzetti | first7=Daniela | last8=Staudaher | first8=Shawn M. | last9=Engelbracht | first9=Charles W. | display-authors=1 | volume=445 | issue=1 | pages=899–912 | year=2014 | doi=10.1093/mnras/stu1787 | doi-access=free | arxiv=1409.0847 | bibcode=2014MNRAS.445..899C }}
| last1=Paturel | first1=G. | last2=Petit | first2=C. | last3=Prugniel | first3=Ph. | last4=Theureau | first4=G. | last5=Rousseau | first5=J. | last6=Brouty | first6=M. | last7=Dubois | first7=P. | last8=Cambrésy | first8=L. | title=HYPERLEDA. I. Identification and designation of galaxies | display-authors=1 | journal=Astronomy and Astrophysics | volume=412 | pages=45–55 | date=December 2003 | doi=10.1051/0004-6361:20031411 | doi-access=free | bibcode=2003A&A...412...45P }}
| title=Star Formation Histories of the LEGUS Dwarf Galaxies. I. Recent History of NGC 1705, NGC 4449, and Holmberg II | last1=Cignoni | first1=M. | last2=Sacchi | first2=E. | last3=Aloisi | first3=A. | last4=Tosi | first4=M. | last5=Calzetti | first5=D. | last6=Lee | first6=J. C. | last7=Sabbi | first7=E. | last8=Adamo | first8=A. | last9=Cook | first9=D. O. | last10=Dale | first10=D. A. | last11=Elmegreen | first11=B. G. | last12=Gallagher | first12=J. S. III | last13=Gouliermis | first13=D. A. | last14=Grasha | first14=K. | last15=Grebel | first15=E. K. | last16=Hunter | first16=D. A. | last17=Johnson | first17=K. E. | last18=Messa | first18=M. | last19=Smith | first19=L. J. | last20=Thilker | first20=D. A. | last21=Ubeda | first21=L. | last22=Whitmore | first22=B. C. | display-authors=1 | journal=The Astrophysical Journal | volume=856 | issue=1 | id=62 | page=17 | date=March 2018 | doi=10.3847/1538-4357/aab041 | arxiv=1802.06792 | bibcode=2018ApJ...856...62C | s2cid=119485664 | doi-access=free }}
| title=Chemical Abundances and Properties of the Ionized Gas in NGC 1705 | last1=Annibali | first1=F. | last2=Tosi | first2=M. | last3=Pasquali | first3=A. | last4=Aloisi | first4=A. | last5=Mignoli | first5=M. | last6=Romano | first6=D. | display-authors=1 | journal=The Astronomical Journal | volume=150 | issue=5 | id=143 | page=23 | date=November 2015 | doi=10.1088/0004-6256/150/5/143 | arxiv=1505.05545 | bibcode=2015AJ....150..143A | s2cid=119249162 }}
| title=H I synthesis observations of the blue compact dwarf NGC 1705 | display-authors=1 | last1=Elson | first1=E. C. | last2=de Blok | first2=W. J. G. | last3=Kraan-Korteweg | first3=R. C. | journal=Monthly Notices of the Royal Astronomical Society | volume=429 | issue=3 | pages=2550–2561 | date=March 2013 | doi=10.1093/mnras/sts526 | doi-access=free | arxiv=1301.2889 | bibcode=2013MNRAS.429.2550E }}
| title=Near-infrared spectroscopy of the super star cluster in NGC 1705 | last1=Martins | first1=F. | last2=Förster Schreiber | first2=N. M. | last3=Eisenhauer | first3=F. | last4=Lutz | first4=D. | display-authors=1 | journal=Astronomy & Astrophysics | volume=547 | id=A17 | page=4 | date=November 2012 | doi=10.1051/0004-6361/201220144 | arxiv=1209.3910 | bibcode=2012A&A...547A..17M | s2cid=56159879 }}
References
- (1 February 2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal.
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