All Questions
Tagged with event-horizon-telescope radio-astronomy
11
questions
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 ...
- 1,758
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* ...
- 17.6k
3
votes
1
answer
201
views
How, precisely, do radio astronomers detect (and record) the phases of waves for interferometry?
Interferometry is always in the news, and at radio frequencies it has been for a long time...
The popular press always talks about directly 'interfering' two waves as they come in, but can they tell ...
- 5,307
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
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 ...
- 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
2
votes
1
answer
171
views
From whence is the Event Horizon Telescope black hole data available for amateur reconstruction?
Ralf Vandebergh's tweet shows his own reconstruction of an image of the accretion disk around a black hole, generated presumably from Event Horizon Telescope data.
I'm assuming that the data came ...
- 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 ...
- 10.3k
12
votes
3
answers
423
views
What else could the Event Horizon Telescope Observe?
The Event Horizon Telescope was made possible in order to observe the details of supermassive black holes. This took a huge amount of work installing extra telescopes and developing the hardware and ...
- 10.3k
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 ...
- 30.7k
6
votes
2
answers
209
views
Is there any update on the Availability of Event Horizon Telescope Images?
There has been no news on the obvious public channels from the EHT project since last (Northern) summer. Does anyone have more information on when any results from the April 2017 run might be released?...
- 10.3k