NGC 1705
A starbursting blue compact dwarf in the Dorado Group.
NGC 1705 is a peculiar lenticular galaxy and a blue compact dwarf galaxy (BCD) located in the southern constellation of Pictor, less than a degree east of Iota Pictoris. It is undergoing a starburst and is a member of the Dorado Group, estimated to be approximately 17 million light-years from Earth. With an apparent visual magnitude of 12.6, it requires a telescope to observe.
Quick Facts
- Epoch
- J2000
- Ra
- 04 · 54 · 13.500
- Dec
- −53 · 21 · 39.82
- Group Cluster
- Dorado Group
- Dist Ly
- 5.1 ±
- Z
- 633 ± 6 km/s
- Appmag V
- 12.56 · 0.03
- Constellation Name
- Pictor
- Names
- PGC 16282
Facts from the source article.
Lore & Background
NGC 1705 is a relatively isolated galaxy, with its nearest neighbors being more than distant. Its neutral hydrogen disk shows a significant amount of warp, suggesting that the outer gas is still settling into place. Mass models of the galaxy indicate that the dominant source of mass is a dark matter halo. A super star cluster, designated NGC 1750–1, is located near the galactic center; it has a maximum radius and an age measured in millions of years, though specific values are not recorded here.
Reader's Guide
The major starburst activity in NGC 1705 is concentrated at the core, within the central region, and this activity provides the main ionizing source out to a distance of or more. Over the last 10 million years, the starburst has added a certain amount of stars. The younger stars in the galaxy, with ages below a billion years, have an estimated value and are mainly concentrated near the center, while the older star populations have a different value and form a more extended distribution. The total mass of neutral hydrogen in the galaxy is estimated at a specific figure. The galaxy also shows strong galactic winds. Its significance lies in being a nearby example of a starbursting blue compact dwarf, offering insights into star formation processes and the role of dark matter in such systems.
Did You Know?
- It contains a super star cluster designated NGC 1750–1 near its center.
- The galaxy's neutral hydrogen disk shows a significant warp, indicating outer gas is still settling.
- Mass models suggest a dark matter halo is the dominant source of mass in NGC 1705.
More in Galaxy Clusters and Groups, Part 4 1-24
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