Hubble Revisits a Galactic Oddball

The dwarf galaxy NGC 1705 is featured in this image from the NASA/ESA Hubble Space Telescope. This diminutive galaxy lies in the southern constellation Pictor, and is approximately 17 million light-years from Earth. NGC 1705 is a cosmic oddball — it is small, irregularly shaped, and has recently undergone a spate of star formation known as a starburst. 

Despite these eccentricities, NGC 1705 and other dwarf irregular galaxies like it can provide valuable insights into the overall evolution of galaxies. Dwarf irregular galaxies tend to contain few elements other than hydrogen or helium, and are considered to be similar to the earliest galaxies that populated the Universe.

The data shown in this image come from a series of observations designed to unveil the interplay between stars, star clusters, and ionised gas in nearby star-forming galaxies. By observing a specific wavelength of light known as H-alpha with Hubble’s Wide Field Camera 3, astronomers aimed to discover thousands of emission nebulae — regions created when hot, young stars bathe the clouds of gas surrounding them in ultraviolet light, causing them to glow.

This is not the first time that NGC 1705 has been imaged by Hubble — astronomers peered into the heart of the galaxy in 1999 using Hubble’s workhorse camera at the time, the Wide Field Planetary Camera 2. This instrument was replaced with the Wide Field Camera 3 during the fifth and final Space Shuttle mission to Hubble in 2009, and the newer instrument has provided a richer and far more detailed portrait of NGC 1705 than the 1999 observation.

Credit:

ESA/Hubble & NASA, R. Chandar

About the Image

Id:potw2205a
Type:Observation
Release date:31 January 2022, 06:00
Size:3919 x 2192 px

About the Object

Name:NGC 1705
Constellation:Pictor
Category:Galaxies

Image Formats

Large JPEG
3.8 MB
Screensize JPEG
223.8 KB

Zoomable


Wallpapers

1024x768
404.7 KB
1280x1024
713.7 KB
1600x1200
1.0 MB
1920x1200
1.1 MB
2048x1536
1.7 MB

Coordinates

Position (RA):4 54 13.95
Position (Dec):-53° 21' 40.35"
Field of view:2.59 x 1.45 arcminutes
Orientation:North is 47.0° left of vertical


Colours & filters

BandWavelengthTelescope
Ultraviolet
UV
275 nm Hubble Space Telescope
WFC3
Optical
B
438 nm Hubble Space Telescope
WFC3
Optical
U
336 nm Hubble Space Telescope
WFC3
Optical
Strömgren y
547 nm Hubble Space Telescope
WFC3
Optical
V
555 nm Hubble Space Telescope
WFC3
Optical
I
814 nm Hubble Space Telescope
WFC3
Optical
H-alpha + N II
657 nm Hubble Space Telescope
WFC3

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