I Zwicky 18

I Zwicky 18 (I Zw 18), by Fritz Zwicky, is a dwarf galaxy about 59 million light -years away.

For a long time it was assumed that the galaxy formation was already finished a few billion years after the Big Bang. The end of 2004 was confident because of recordings by the Hubble telescope that I Zwicky 18 is only 500 million years old - as opposed, for example, to the Milky Way, which already has an age of 12 billion years.

Based on new evaluations of recordings from the Hubble telescope in 2007 but low luminosity, red stars in I Zwicky 18 were detected, suggesting that the galaxy is much older than previously thought, namely between 1 and 10 billion years ago.

In addition, removal of I Zwicky 18 has been corrected to the Milky Way at 59 million light-years by more recent measurements of Cepheids.

The galaxy has been rather unproductive most of the time since its inception and has started relatively late with the formation of most of their stars in existence today. The reason for the late star formation is currently unknown.

Sources and links

  • SPIEGEL TV: " The age-old baby galaxy "
  • Astro News: " The baby galaxy is older than we thought.
Declination Radial velocity
422555
de