[HN Gopher] The Event Horizon Telescope image might need a corre...
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       The Event Horizon Telescope image might need a correction
        
       Author : niemandhier
       Score  : 47 points
       Date   : 2024-10-28 06:46 UTC (16 hours ago)
        
 (HTM) web link (academic.oup.com)
 (TXT) w3m dump (academic.oup.com)
        
       | niemandhier wrote:
       | An independent hybrid imaging of Sgr A* from the data in EHT 2017
       | observations
        
         | aaroninsf wrote:
         | "In our view, the ring-like image found by the EHTC is not the
         | intrinsic structure of Sgr A* but arises from the sparse u-v
         | coverage of the EHT array in 2017; that is, from the
         | corresponding [...] structure in the PSF."
         | 
         | I.e. authors assert the image processing path inserted rather
         | than revealed the famous correlation with _Interstellar_ black
         | hole imagery.
        
           | somat wrote:
           | I hesitate to comment on something I know so little about,
           | but that has never stopped me before.
           | 
           | The EHTC approach would appear impossible to calibrate
           | correctly, My understanding(the thousand foot view really) is
           | they calibrated a generative model on what they expect to see
           | based on their expected inputs, fed in the actual inputs and
           | got what they trained their model on. great success, good
           | work everyone.
           | 
           | I guess my unease with this approach is it feels there are
           | too many assumptions baked in.
        
       | ck2 wrote:
       | Way way beyond my comprehension but I will marvel at how peer-
       | review works in science and wonder how much further the world
       | would have progressed if everything worked like that.
        
         | exe34 wrote:
         | my favourite abstract was one where the title asked "did cern
         | measure a neutrino travelling faster than the speed of light?"
         | and the abstract was "no".
         | 
         | for some reason I can't seem to find the paper anymore, it was
         | on arxiv.
        
           | fsh wrote:
           | It's probably this paper:
           | https://doi.org/10.1088/1751-8113/44/49/492001
        
             | exe34 wrote:
             | oh that might be it, two words, they went all out in the
             | final version!
             | 
             | edit: no, I must have embellished it in my mind:
             | https://arxiv.org/abs/1110.2832
        
           | ceejayoz wrote:
           | I like this one.
           | 
           | The unsuccessful self-treatment of a case of "writer's
           | block": https://pmc.ncbi.nlm.nih.gov/articles/PMC1311997/
        
         | xelamonster wrote:
         | It's a bit dense for sure, lost me a few paragraphs in but this
         | sentence got the point across well enough:
         | 
         | > It is not based on consistency with the observed data, but
         | rather on the highest rate of appearance of the image
         | morphology from a wide imaging parameter space.
         | 
         | I think the claim here is the original image effectively
         | optimized for "cool shape" instead of accuracy.
         | 
         | I also had to jump halfway down the page to find the images, it
         | was driving me crazy to read about their differences without
         | any idea what they looked like.
        
       | fsh wrote:
       | The authors have feuded with the EHT collaboration for quite a
       | while. Here is a previous reply by the collaboration:
       | https://eventhorizontelescope.org/blog/imaging-reanalyses-eh...
        
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       (page generated 2024-10-28 23:02 UTC)