File:GALEX Andromeda Mosaic (26137651424).png
Original file (9,690 × 8,237 pixels, file size: 141.91 MB, MIME type: image/png)
Captions
Summary[edit]
DescriptionGALEX Andromeda Mosaic (26137651424).png |
English: I have recently turned my attention to some archival GALEX data and found it quite promising. What surprised me the most was the presence of galactic cirrus in the FUV (far ultraviolet) channel. Because I am unfamiliar with the "personality" of the telescope I almost mistook it for some kind of odd artifacting. As far as I know, this cirrus has never been presented in a GALEX image before, so I am happy to have found it there. If you are having a hard time seeing it, a brighter version is available here (6.7MB JPG).
Processing notes: Of greatest concern is the FUV-bright star (Nu Andromedae) in the lower left. There was no FUV data available; all came from a single, low duration NUV (near ultraviolet) exposure. The brightness of the star was interpolated based on nearby contextual clues from frames which did contain FUV information. It is definitely the brightest FUV source in the frame, and I think it was fair to "fake" it like this. From what I am able to gather, observations of bright FUV sources were avoided due to long-term issues with the detectors, so that is probably why there were never any exposures of this particular star. Several areas are monochrome like this, mostly in the lower left corner and another near the southern tip of the galaxy. These filler data are very coarse and do not look good up close, but they had to suffice. Many little annuli were removed, including a giant line of them emanating from Nu Andromedae. I tried to match the backgrounds of each frame as well as I could, but it's not by any means perfect. The NUV channel in particular was devilishly hard to match each disc-shaped frame against one another. To make the local galactic cirrus more clearly visible, this image relies on complex (or at least, not-quite-simple) color channel assignments. It is similar to an orange-cyan (red-pseudogreen-blue) image, but some of the FUV data is shown a bit greener in the darker areas to bring out the cirrus. Visual aesthetic weighed heavily in the creation of this image, but bluer areas are more intense in FUV and redder areas are more intense in the NUV with the exception of monochrome areas which appear only cyan.
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Date | Taken on 28 April 2016, 03:11:51 |
Source | GALEX Andromeda Mosaic |
Author | geckzilla |
Flickr sets InfoField | GALEX; all astronomy; Spirals in Galaxies |
Flickr tags InfoField | nearultraviolet; fuv; spiral; cirrus; nuandromedae; farultraviolet; m31; astronomy; nuv; ultraviolet; mosaic; galaxy; galex; andromeda |
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This image was originally posted to Flickr by geckzilla at https://flickr.com/photos/54209675@N00/26137651424. It was reviewed on 27 February 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
27 February 2024
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:19, 27 February 2024 | 9,690 × 8,237 (141.91 MB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://live.staticflickr.com/1530/26137651424_39c9684296_o.png via Commons:Spacemedia |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Width | 3,840 px |
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Height | 3,840 px |
Bits per component | 8 |
Compression scheme | Uncompressed |
Number of components | 1 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Color space | sRGB |
Image width | 9,690 px |
Image height | 8,237 px |
Software used | Adobe Photoshop CC 2015 (Windows) |
Date and time of digitizing | 23:11, 27 April 2016 |
File change date and time | 18:16, 4 May 2016 |
Date metadata was last modified | 18:16, 4 May 2016 |
Unique ID of original document | xmp.did:788c9968-f79f-674e-9cc0-2b550e9e2874 |