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The "photo" of the black hole has been retouched!
The original is on the screen of Katie Bouman's laptop:
https://sites.google.com/site/testso...ies/bouman.jpg So there are other similar structures around the black hole formation. Either this makes the program or they actually exist. In the last case we would have several black holes. Best regards Walter |
#2
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The "photo" of the black hole has been retouched!
In article ,
writes: The original is on the screen of Katie Bouman's laptop: https://sites.google.com/site/testso...ies/bouman.jpg Why do you think a random image on a laptop is "the original" rather than some work-in-progress image? What do you even mean by "the original?" EHT made images on four different days, each processed independently by four different teams. Which is "the original?" The paper at https://iopscience.iop.org/article/1...41-8213/ab0e85 gives an _overview_ of the imaging process. All the relevant papers are linked from https://iopscience.iop.org/journal/2...e/Focus_on_EHT -- Help keep our newsgroup healthy; please don't feed the trolls. Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA |
#3
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The "photo" of the black hole has been retouched!
Am Mittwoch, 17. April 2019 22:21:47 UTC+2 schrieb Steve Willner:
In article , writes: The original is on the screen of Katie Bouman's laptop: https://sites.google.com/site/testso...ies/bouman.jpg Why do you think a random image on a laptop is "the original" rather than some work-in-progress image? What do you even mean by "the original?" EHT made images on four different days, each processed independently by four different teams. Which is "the original?" Even in papers the images are already retouched. Compare the image on Katie Bouman's laptop and there left image from Paper https://cdn.iopscience.com/images/20...b0e85f4_lr.jpg Katie Bouman's image is sharper and includes more details. |
#5
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The "photo" of the black hole has been retouched!
Am Donnerstag, 18. April 2019 09:27:08 UTC+2 schrieb Martin Brown:
On 18/04/2019 08:03, wrote: Katie Bouman's image is sharper and includes more details. They are not necessarily "details" so much as imaging artefacts that haven't quite been fully calibrated out yet. The image in Paper is more blurred and also darkened on the edge. The good word "Calibrate" I would not use for this kind of editing |
#6
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The "photo" of the black hole has been retouched!
On 18/04/2019 10:55, wrote:
Am Donnerstag, 18. April 2019 09:27:08 UTC+2 schrieb Martin Brown: On 18/04/2019 08:03, wrote: Katie Bouman's image is sharper and includes more details. They are not necessarily "details" so much as imaging artefacts that haven't quite been fully calibrated out yet. The image in Paper is more blurred and also darkened on the edge. The good word "Calibrate" I would not use for this kind of editing But it is pretty much what happens when the phase calibration of VLBI baseline data is fine tuned by self calibration on the initial result. Basically you can use the known property of the sky brightness being everywhere positive to detect and fix residual systematic errors. A brief introduction to VLBI is online here. http://www.phys.unm.edu/~gbtaylor/as.../vlbi_apr4.pdf I would refer you to page 45 of it which shows the result of VLBI on a fairly typical source without phase calibration, with first cut reference only and then the final image after full self calibration. Note that some of the junk on the intermediate image has coalesced into real source structure and the resulting background is much flatter. FWIW M87 jets observed by VLBI at 43GHz on a 10mas image size are on page 11 although a nicer video at several epochs is online he http://www.aoc.nrao.edu/~cwalker/M87...vies_only.html -- Regards, Martin Brown |
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