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SPACE SCOPES
A Spiral Galaxy in Hydra
by Staff Writers
Baltimore MD (SPX) Apr 12, 2012

Credit: ESA/Hubble and NASA. For a larger version of this image please go here.

This image from the NASA/ESA Hubble Space Telescope shows NGC 4980, a spiral galaxy in the southern constellation of Hydra. The shape of NGC 4980 appears slightly deformed, something which is often a sign of recent tidal interactions with another galaxy. In this galaxy's case, however, this appears not to be the case as there are no other galaxies in its immediate vicinity.

The image was produced as part of a research program into the nature of galactic bulges, the bright, dense, elliptical centers of galaxies. Classical bulges are relatively disordered, with stars orbiting the galactic center in all directions.

In contrast, in galaxies with so-called pseudobulges, or disc-type bulges, the movement of the spiral arms is preserved right to the center of the galaxy.

Although the spiral structure is relatively subtle in this image, scientists have shown that NGC 4980 has a disc-type bulge, and its rotating spiral structure extends to the very center of the galaxy.

A galaxies' bright arms are the location of new star formation in spiral galaxies, and NGC 4980 is no exception. The galaxy's arms are traced out by blue pockets of extremely hot newborn stars are visible across much of its disc.

This sets it apart from the reddish galaxies visible in the background, which are distant elliptical galaxies made up of much older, and hence redder, stars.

This image is composed of exposures taken in visible and infrared light by Hubble's Advanced Camera for Surveys. The image is approximately 3.3 by 1.5 arcminutes in size.

Related Links
Hubble at NASA
Space Telescope News and Technology at Skynightly.com




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e-MERLIN's deep radio survey of the Hubble Deep Field: first results
Manchester, UK (SPX) Apr 10, 2012
A team of astronomers at Jodrell Bank Observatory have begun the deepest ever high-resolution radio imaging of the region around the Hubble Deep Field (HDF), the images originally captured by the Hubble Space Telescope (HST) in the mid 1990s. The HDF led to the discovery of numerous galaxies billions of light years distant and provided direct visual evidence of the evolution of the Universe. ... read more


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