Questions tagged [event-horizon-telescope]
Questions about the Event Horizon Telescope, or EHT.
32
questions
8
votes
2
answers
1k
views
Would Hubble Space Telescope improve black hole image observed by EHT if it joined array of telesopes?
My question is related to black hole image released in April. As far as I understand idea of EHT, it joins observations from multiple locations to work like one telescope with radius that is equal to ...
- 111
3
votes
0
answers
59
views
Mark 6 VLBI Recorder 32Gpbs, 2 bit sampling
I was reading the paper about the first M87 EHT Results, part 3 (link to article PDF), where the data processing pipeline is explained. The recording system used was a Mark 6 recorder with 32Gbps and ...
- 8,452
2
votes
2
answers
186
views
What is stopping Event Horizon Telescope the size of the Earth’s orbit?
There is a proposal to include a radio sensor in a telescope going to the Sun-Earth L2, getting 120x improvement in angular resolution to EHT. Knowing nothing about interferometry, it seems pretty ...
- 2,065
6
votes
2
answers
107
views
In terms of results, how similar is a bunch of telescopes across the globe to an Earth-sized telescope?
The Event Horizon Telescope emulates an Earth-sized telescope by syncing a bunch of radio telescopes across the planet to do take pictures with a small enough angular resolution to take pictures of a ...
- 3,873
3
votes
1
answer
141
views
Does the newly found orientation of Sgr A* match the theory that the Fermi bubbles might have been caused by jets?
The EHT just announced their great findings about Sgr A*, amongst other cool things they found that we look towards the black hole face on which means that if there is a jet it approximately looks ...
7
votes
3
answers
389
views
How can the Event Horizon Telescope image Sgr A* when it's not visible from all sites at one time?
I went to https://eventhorizontelescope.org/array and read about the ten sites listed as part of the EHT, I have a mashed-up screen shot of them below.
I made a little script also shown below with ...
- 156k
9
votes
2
answers
926
views
Why is the ring in this simulation of Sgr A* off center?
In the recent releases of images of Sgr A*, simulated versions of what they expected were included along side the actual images they were able to get. What confuses me about these simulated images (...
7
votes
1
answer
720
views
Is this image of Sgr A* correctly labelled?
This BBC article contains this "schematic description" of the EHT Sgr A* image:
The source is described only as "EHT Collaboration" and I haven't been able to find the original ...
- 156k
4
votes
1
answer
328
views
Will the first Event Horizon Telescope image of the Milky Way's black hole Sgr A* just be another lumpy orange donut?
@HDE226868's answer to Why doesn't the black hole in the center of the Milky Way glow similarly to the famous M87 image? explains that neither black hole is orange and any Event Horizon Telescope ...
- 156k
3
votes
1
answer
349
views
How will they know when to start taking the picture of the black hole at the center of the Milky Way?
@csm's answer to Why not take a picture of a closer black hole? points out that it's necessary for the supermassive black hole at the center of a galaxy to be actively feeding for it to generate a ...
- 30.7k
5
votes
1
answer
119
views
Could images of (very) nearby targets be recovered from Event Horizon Telescope data?
Reading this question I was struck by the fact that the "pointing" of an interferometer is effectively done in the correlator, at least within the common field of view of all the telescopes, which is ...
- 30.7k
2
votes
0
answers
94
views
Why hasn't the EHT taken an image of Sgr A*? [duplicate]
The Event Horizon Telescope or EHT took an image or the black hole at the center of M87 in 2019, and in 2021 it measured the polarization of the light from M87*. Right after the first image of M87* ...
- 30.7k
9
votes
1
answer
2k
views
Doubt regarding size and shape of black hole images published by the Event Horizon Telescope (EHT)
The recent publications of the images of black hole shadow by the Event Horizon Telescope collaboration prompts us to study black hole images in more details. According to the no-hair theorem, the ...
- 156k
6
votes
3
answers
827
views
Can the Event Horizon Telescope been used to find intergalactic distances?
Now that we have the Event Horizon Telescope (EHT), why can't we just guess and check intergalactic distances by changing the EHT's focal length? For instance why don't we take another picture of M87,...
- 30.7k
7
votes
1
answer
143
views
Is there any work underway to push the long baseline capabilities of the Event Horizon Telescope to sub-millimeter wavelengths?
The Max Planck Institute for Radio Astronomy's press release Something is Lurking in the Heart of Quasar 3C 279; First Event Horizon Telescope Images of a Black-Hole Powered Jet shows a stunning ...
- 30.7k