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| | | | | | | Hubble highlights two galaxies that are losing it
30 September 2009
| This composite shows the two galaxies NGC 4522 and NGC 4402 in the Virgo Cluster that are affected by a process known as ‘ram pressure stripping’, which can result in peculiar-looking galaxies.
Hubble's Advanced Camera for Surveys (ACS) allows astronomers to study an interesting and important phenomenon called ram pressure stripping that is so powerful, it is capable of mangling galaxies and even halting their star formation.
NGC 4522 is a spectacular example of a spiral galaxy that is currently being stripped of its gas content. Part of the Virgo galaxy cluster, its rapid motion within the cluster results in strong winds across the galaxy as the gas within is left behind. Scientists estimate that the galaxy is moving at more than 10 million kilometres per hour. A number of newly-formed star clusters that developed in the stripped gas can be seen in the Hubble image. The stripped spiral galaxy is located some 60 million light-years away from Earth.
The second image shows NGC 4402 and highlights some telltale signs of ram pressure stripping such as the curved, or convex, appearance of the disc of gas and dust, a result of the forces exerted by the heated gas. Light being emitted by the disc backlights the swirling dust that is being swept out by the gas. Studying ram pressure stripping helps astronomers better understand the mechanisms that drive the evolution of galaxies, and how the rate of star formation is suppressed in very dense regions of the Universe like clusters.
Credits: NASA & ESA | |  |  | |
| | | | | Hubble's Advanced Camera for Surveys (ACS) allows astronomers to study an interesting and important phenomenon called ram pressure stripping that is so powerful, it is capable of mangling galaxies and even halting their star formation.
NGC 4522 is a spectacular example of a spiral galaxy that is currently being stripped of its gas content. Part of the Virgo galaxy cluster, its rapid motion within the cluster results in strong winds across the galaxy as the gas within is left behind. Scientists estimate that the galaxy is moving at more than 10 million kilometres per hour. A number of newly-formed star clusters that developed in the stripped gas can be seen in the Hubble image. The stripped spiral galaxy is located some 60 million light-years away from Earth.
Even though it is a still image, Hubble's view of NGC 4522 practically swirls off the page with apparent movement. It highlights the dramatic state of the galaxy with a vivid view of the gas being forced out of it. Bright blue pockets of new star formation can be seen to the right and left of centre.
Credits: NASA & ESA | | | | |
| | | | | This image shows NGC 4522 within the context of the Virgo Cluster.
Credits: NASA, ESA and the Digitized Sky Survey 2. Acknowledgment: Davide De Martin (ESA/Hubble) | | | | |
| | | | | The image of NGC 4402 highlights some telltale signs of ram pressure stripping such as the curved, or convex, appearance of the disc of gas and dust, a result of the forces exerted by the heated gas. Light being emitted by the disc backlights the swirling dust that is being swept out by the gas. Studying ram pressure stripping helps astronomers better understand the mechanisms that drive the evolution of galaxies, and how the rate of star formation is suppressed in very dense regions of the Universe like clusters.
Credits: NASA & ESA | | | | |
| | | | | This image shows NGC 4402 within the context of the Virgo Cluster.
Credits: NASA, ESA and the Digitized Sky Survey 2. Acknowledgment: Davide De Martin (ESA/Hubble) | | | | |
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