News Release Archive:

News Release 239 of 1051

November 10, 2011 09:00 AM (EST)

News Release Number: STScI-2011-31

Hubble Uncovers Tiny Galaxies Bursting with Star Birth in Early Universe


Image: Hubble Spies Tiny Galaxies Aglow with Star Birth in the UDS Field

Hubble Spies Tiny Galaxies Aglow with Star Birth in the UDS FieldSTScI-PRC2011-31b

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This image reveals 28 tiny galaxies uncovered by NASA's Hubble Space Telescope. The puny galaxies, shown in the postage-stamp-sized images, existed 9 billion years ago and are brimming with star birth.

The dwarf galaxies are typically a hundred times less massive than the Milky Way galaxy but are churning out stars at such a furious pace that their stellar content would double in just 10 million years. Hubble's Wide Field Camera 3 and Advanced Camera for Surveys spied the galaxies in the UKIDSS Ultra Deep Survey field, or UDS (part of the UKIRT Infrared Deep Sky Survey). The galaxies' locations in the UDS field are marked by circles in the large image.

The galaxies stood out in the Hubble images because the energy from all the new stars caused the oxygen in the gas surrounding them to light up like a bright neon sign. The rapid star birth likely represents an important phase in the formation of dwarf galaxies, the most common galaxy type in the cosmos.

The galaxies are among 69 dwarf galaxies found in the UDS and other fields. The images were made from observations taken between August and December 2010.

Object Name: Ultra Deep Survey (UDS) Field

Image Type: Astronomical/Annotated

Credit: NASA, ESA, A. van der Wel (Max Planck Institute for Astronomy, Heidelberg, Germany), H. Ferguson and A. Koekemoer (Space Telescope Science Institute, Baltimore, Md.), and the CANDELS team


The above montage includes these images:

CANDELS Ultra Deep Survey (UDS) Image Type: Astronomical CANDELS Ultra Deep Survey (UDS) Extreme Emission Line Galaxies in the Ultra Deep Survey (UDS) Image Type: Astronomical Extreme Emission Line Galaxies in the Ultra Deep Survey (UDS)

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