File:Gravitational lens in EMSS 2137–23 (eso9211a).tif
Original file (2,364 × 1,719 pixels, file size: 3.38 MB, MIME type: image/tiff)
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Summary[edit]
DescriptionGravitational lens in EMSS 2137–23 (eso9211a).tif |
English: This image shows the compact cluster of galaxies EMSS 2137--23 and the "giant arc", just north of the centre of the cluster. It was obtained in June 1992 with the ESO 3.5-m New Technology Telescope (NTT) and the ESO Multi-Mode Instrument (EMMI) during remote observations from the Trieste Astronomical Observatory. The observers were Massimo Ramella and Mario Nonino of the Trieste Observatory. The measured redshift of EMSS 2137--23 is 0.32, corresponding to a radial velocity of ~ 80,000 km/sec and a distance of about 5,000 million light-years. The 15-arcsec long arc consists of at least two parts and is a "gravitational lens" effect, that is the distorted and amplified image of a galaxy situated behind the cluster at an even larger distance. The arc is well visible north of (above) the combined image of several galaxies, here overexposed in order to bring out the relatively faint image of the arc (total magnitude R = 21.5). Many of the other objects seen on the photo are galaxies in the cluster, but some are foreground stars in the Milky Way. Technical information: Combination of 5 exposures (V, R and I). Total exposure time: 95 min. Observing conditions: moderately good. Seeing: ~ 1.0 arcsecond. Scale: 1 pixel = 0.44 arcsecond. Field of photo: 70 x 52 arcsec. Orientation: North up and East to the left. |
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Date | 13 August 1992 (upload date) | ||
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Author | ESO | ||
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Licensing[edit]
This media was created by the European Southern Observatory (ESO).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public ESO website, along with the texts of press releases, announcements, pictures of the week, blog posts and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. | |
This file is licensed under the Creative Commons Attribution 4.0 International license.
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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:42, 1 November 2023 | 2,364 × 1,719 (3.38 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://www.eso.org/public/archives/images/original/eso9211a.tif via Commons:Spacemedia |
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Metadata
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Width | 2,364 px |
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Height | 1,719 px |
Bits per component | 8 |
Compression scheme | LZW |
Pixel composition | Black and white (Black is 0) |
Orientation | Normal |
Number of components | 1 |
Number of rows per strip | 110 |
Horizontal resolution | 1,600 dpi |
Vertical resolution | 1,600 dpi |
Software used | Adobe Photoshop CS3 Windows |
File change date and time | 16:43, 30 June 2010 |
Color space | Uncalibrated |