File:Hubble Finds Giant Halo Around the Andromeda Galaxy (18405594461).jpg
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editDescriptionHubble Finds Giant Halo Around the Andromeda Galaxy (18405594461).jpg |
This diagram shows how scientists determined the size of the halo of the Andromeda galaxy. Because the gas in the halo is dark, the team measured it by using the light from quasars, the very distant bright cores of active galaxies powered by black holes. They observed the quasars’ light as it traveled through the intervening gas. The halo’s gas absorbed some of that light and made the quasar appear darker in a very small wavelength range. By measuring the tiny dip in brightness at that specific range, scientists could tell how much gas is between us and each quasar. Some quasars showed no dip in brightness, and this helped define the size of the halo. More information: <a href="http://www.spacetelescope.org/images/opo1515a/" rel="nofollow">www.spacetelescope.org/images/opo1515a/</a> Credit: NASA, ESA, and A. Feild (STScI) |
Date | |
Source | Hubble Finds Giant Halo Around the Andromeda Galaxy |
Author | Hubble ESA |
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This image was originally posted to Flickr by Hubble Space Telescope / ESA at https://flickr.com/photos/51268976@N08/18405594461. It was reviewed on 8 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
8 December 2020
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Credit/Provider | NASA, ESA, and A. Feild (STScI) |
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Source | ESA/Hubble |
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Date and time of data generation | 09:31, 8 May 2015 |
Software used | Adobe Photoshop CS4 Macintosh |
Copyright status | Copyright status not set |
Unique ID of original document | xmp.did:A85C70CF1F206811822A95496E532007 |
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Contact information |
http://www.spacetelescope.org/ Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM version | 4 |