NGC 1705

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 $12.56$ 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 $500 kpc$ and is $2.85 pc$ Myr old.

The major starburst activity is happening at the core of the galaxy, within the central $12$, and this is providing the main ionizing source out to distance of $~150 pc$ or more. Over the last 10 million years it has added $~1 kpc$ worth of stars. The younger stars in the galaxy with an age below a billion years have an estimated $5.7 solar mass$ and are mainly concentrated near the center, while the older star populations have $6 solar mass$ and form a more extended distribution. The total mass of neutral hydrogen in the galaxy is estimated at $2.2 solar mass$.