Hubble image archive
I Zwicky 18: Possibly the Youngest Galaxy Ever Seen
NASA's Hubble Space Telescope snapped a view of what may be the youngest galaxy ever seen. This "late bloomer" may not have begun active star formation until about 13 billion years after the Big Bang. Called I Zwicky 18 [below, left], the galaxy may be as young as 500 million yea...
- Date
- Jan 1, 2004
- Mission
- Hubble Space Telescope
- Archive ID
- hubblesite-images-2004-35-1621-image
NASA's Hubble Space Telescope snapped a view of what may be the youngest galaxy ever seen. This "late bloomer" may not have begun active star formation until about 13 billion years after the Big Bang. Called I Zwicky 18 [below, left], the galaxy may be as young as 500 million years old. This youngster has gone though several sudden bursts of star formation - the first only some 500 million years ago and the latest only 4 million years ago. This galaxy is typical of the kinds of galaxies that inhabited the early universe. The galaxy is classified as a dwarf irregular galaxy and is much smaller than our Milky Way.
The two major starburst regions are the concentrated bluish-white knots embedded in the heart of the galaxy. The wispy blue filaments surrounding the central starburst region are bubbles of gas that have been heated by stellar winds and intense ultraviolet radiation unleashed by hot, young stars. The redder stars are slightly older stars and star clusters, but they are still less than 1 billion years old. A companion galaxy lies just above and to the right of the dwarf galaxy. The companion may be interacting with the dwarf galaxy and may have triggered that galaxy's recent star formation. The red blobs surrounding the dwarf galaxy are the dim glow from ancient fully formed galaxies.
This image was taken with Hubble's Advanced Camera for Surveys in 2003.
Credits
NASA, ESA, Y. Izotov (Main Astronomical Observatory, Kyiv, UA) and T. Thuan (University of Virginia)Image Details
| About The Object | |
|---|---|
| Object Name | I Zwicky 18, I Zw 18 |
| Object Description | Irregular Dwarf Galaxy |
| R.A. Position | 09h 34m 0.9s |
| Dec. Position | 55° 14' 34.19" |
| Constellation | Ursa Major |
| Distance | 45 million light-years (14 Megaparsecs) |
| Dimensions | This image is 50 arcseconds (11,000 light-years or 3.3 kiloparsecs) wide. |
| About The Data | |
| Data Description | The Hubble image was created from HST data from proposal : T. Thuan (Univ. of Virginia) and Y. Izotov (Main Astronomical Observatory, Kyiv, UA). The Hubble NICMOS data are from the following HST proposals: and : G. Ostlin (Stockholm Univ.), N. Bergvall, A. Hidalgo Gamez, and K. Olofsson (Uppsala Astronomical Observatory), and J. Rönnback (Uppsala Univ.). The science team is comprised of G. Ostlin of (Stockholm Observatory) and M. Mouhcine (Univ. of Nottingham). |
| Instrument | HST>ACS/WFC and HST>NICMOS |
| Exposure Dates | May 26 – June 6, 2003, Exposure Time: 19 hours (ACS); December 28, 1997; Feb 15/22, 1998, Exposure Time: 12 hours (NICMOS) |
| Filters | ACS: F555W (V) and F814W (I) NICMOS: F110W (J) F160W (H), F205W (K), F171M (1.68-1.76 µm) and F180M (1.76-1.83 µm) |
| About The Image | |
| Color Info | Blue: WFPC2 F450W (B) Green: ACS F555W (V) Red: ACS F814W (I) |
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Image and source material are credited to the official mission archive linked below.
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