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May 13th, 2022 | #1 |
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Supermassive black hole at Milky Way's center photographed for first time
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May 15th, 2022 | #3 |
fluxmaster
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You photograph the matter surrounding the black hole. The black hole is the empty space in the middle.
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May 16th, 2022 | #4 | |
RaHoWarrior-SKINHEAD
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Quote:
We've long been able to surmise the black hole at the centre of the galaxy based on the stars that orbit it. That was demonstrated in the 90s. HIGH PROPER-MOTION STARS IN THE VICINITY OF SAGITTARIUS A*: EVIDENCE FOR A SUPERMASSIVE BLACK HOLE AT THE CENTER OF OUR GALAXY - https://ulozto.net/file/BouYipu9w92o...our-galaxy-pdf
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May 16th, 2022 | #5 | |
fluxmaster
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Quote:
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May 17th, 2022 | #6 |
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It was imaged in the microwave spectrum (~1mm wavelength), not the visible spectrum, so colors were assigned to create the "photograph". If we were closer to the center of our galaxy we could probably image it in the visible spectrum, or if we constructed laser interferometers much larger than the Earth (maybe using Lagrange points). Maybe in future.
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May 17th, 2022 | #7 |
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Send the blacks there.
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May 17th, 2022 | #8 | |
fluxmaster
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Quote:
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All these ideas…are chained to the existence of men, to who[m]…they owe their existence. Precisely in this case the preservation of these definite races and men is the precondition for the existence of these ideas. --Adolf Hitler |
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May 17th, 2022 | #9 |
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yes.
[10 char]
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May 19th, 2022 | #10 | |
RaHoWarrior-SKINHEAD
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Quote:
Visible light cannot penetrate all the gasses and dust between us and centre of the galaxy but other types of radiation can and so those are used. Many spectacular images are published in these fields but it's important to remember that the images often have more in common with art than photography.
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May 19th, 2022 | #11 |
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May 19th, 2022 | #12 | ||||
fluxmaster
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Quote:
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All these ideas…are chained to the existence of men, to who[m]…they owe their existence. Precisely in this case the preservation of these definite races and men is the precondition for the existence of these ideas. --Adolf Hitler |
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May 20th, 2022 | #13 | |
RaHoWarrior-SKINHEAD
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Quote:
There are a few different methods used to construct these images (none involve drawing they are computer models). One method used for Sag A* is described in their paper titled 'Selective Dynamical Imaging of Interferometric Data'. You can get an idea of how subjective it is from the abstract: If two independent groups were given this same data they would produce different images. As I said, it is more art than photography. I have uploaded all of the relevant papers in which these discoveries were published. All of the data and full details pertaining to how the discoveries were made and the images constructed is there. There is a lot but definitely worth looking at. - https://ulozto.net/file/KpblAhM1TILU...pe-results-zip
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May 20th, 2022 | #14 |
fluxmaster
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The colors would be different because they're not in the visible wavelengths, so they're arbitrarily chosen, but wouldn't the shapes be the same?
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All these ideas…are chained to the existence of men, to who[m]…they owe their existence. Precisely in this case the preservation of these definite races and men is the precondition for the existence of these ideas. --Adolf Hitler |
May 22nd, 2022 | #15 | |
RaHoWarrior-SKINHEAD
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None of the electromagnetic radiation detected by the radio telescopes is in the visible spectrum, not shape, size or colour, nothing that our eyes can see. First the data is processed to remove as much structural noise as possible and there is a lot. They also have to compensate for significant scattering as well as the rapid motion of source. This is all prior to the imaging process. For the Sgr A* image they used four different imaging methods (i.e., DIFMAP, eht-imaging, SMILI, THEMIS). These programs make hundreds of visual models based on the processed data. (The images below are from the 3rd paper) In the top main panel is shown the representative image of Sgr A* obtained with the EHT from observations on 2017 April 7. This top image is obtained by averaging the bottom four images. On the bottom from left to right, is shown the average images of three prominent ring clusters with different azimuthal structures and a nonring cluster. The height of the colored bar (lower left corner in each panel) represents the relative fraction of images in the Top Sets for each cluster. Note that the THEMIS posterior sample only includes ring images. In each cluster, the image is computed through a weighted average over the descattered reconstructions, including all Top Set images from the three imaging methods (DIFMAP, eht-imaging, and SMILI) and 1024 images randomly selected from descattered posteriors from THEMIS. Images are weighted by the inverse of the total number of Top Set or posterior images used from each pipeline, so that pipelines are represented equally in each image. Note that DIFMAP model images are convolved with a 20 μas beam (represented by the inset circle), while no blurring is applied to the rest of the images. From left to right (separated by vertical lines), are shown the distributions of Top Set images from the DIFMAP, eht-imaging, and SMILI pipelines and posterior samples from the THEMIS pipeline; each vertical panel is further subdivided into clusters identifying common morphologies recovered by each pipeline. The figure is composed of three horizontal panels separated by horizontal lines. The top panel shows individual images randomly sampled from different clusters. The middle and bottom panels visualize the distributions of reconstructed descattered and on-sky Sgr A* images for each cluster, respectively. In each panel, from top to bottom, are shown the average of each cluster, the distributions of the radial profiles, and the distributions of azimuthal intensity profiles. Note that THEMIS images have only three clusters for each of the descattered and on-sky reconstructions their descattered posterior does not contain a nonring cluster, and their on-sky posteriors do not contain an east PA ring cluster. It is far more than can be even adequately summarised here but the data collection, processing, image construction, everything is explained in detail in the published work here - https://ulozto.net/file/KpblAhM1TILU...pe-results-zip
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Last edited by joeylowsac; May 24th, 2022 at 11:10 PM. |
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May 30th, 2022 | #16 |
fluxmaster
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Could M87* Black Hole Image Be Wrong? Study Recreates Something Else
Here's an interesting video claiming that, when the point of view is changed to a wider-angle view, the resulting image is completely different.
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