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#eventhorizontelescope

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Dr. Juande Santander-Vela

Six years since ALMA crucially helped the Event Horizon Telescope take the first image of a supermassive black hole in a distant galaxy… you can relive it all below!

almaobservatory.org/en/press-r

www.almaobservatory.orgAstronomers Capture the First Image of a Black Hole | ALMA ObservatoryPress Conference Streaming The Event Horizon Telescope (EHT), a planet-scale array of eight ground-based radio telescopes forged through international collaboration, was designed to capture images of a black hole. Today, in coordinated press conferences across the globe, EHT researchers reveal that they have succeeded, unveiling the first direct visual evidence of a supermassive black hole...
#ALMA#AtacamaLargeMillimeterSubmillimetreArray#AtacamaLargeMillimeterArray
Dr. Juande Santander-Vela

ALMA, as part of the Event Horizon Telescope, is unveiling a new image of our Milky Way's supermassive black hole, Sagittarius A*, in which strong magnetic fields can be seen…

The most exciting part is that this hints to a jet that would be hidden from our vantage point in our galaxy… but imagine that! We might be like M87, just at a smaller scale!

almaobservatory.org/en/press-r

#ALMA#AlmaObservatory#EHT
Paul Guinnessy

A new image from the #EventHorizonTelescope (EHT) collaboration has uncovered strong and organised magnetic fields spiraling from the edge of the supermassive black hole #SagittariusA* (Sgr A*) eso.org/public/news/eso2406/

www.eso.orgAstronomers unveil strong magnetic fields spiraling at the edge of Milky Way’s central black holeA new image from the Event Horizon Telescope (EHT) collaboration has uncovered strong and organised magnetic fields spiraling from the edge of the supermassive black hole Sagittarius A* (Sgr A*). Seen in polarised light for the first time, this new view of the monster lurking at the heart of the Milky Way galaxy has revealed a magnetic field structure strikingly similar to that of the black hole at the centre of the M87 galaxy, suggesting that strong magnetic fields may be common to all black holes. This similarity also hints toward a hidden jet in Sgr A*. The results were published today in The Astrophysical Journal Letters.
Новини Українською

Чітко, як ніколи: команда Телескопа горизонту подій опублікувала найдетальніше зображення чорної діри itc.ua/ua/novini/chitko-yak-ni #Телескопгоризонтуподій #EventHorizonTelescope #Наукатакосмос #Телескопи #Чорнідіри #Новини #Космос #M87

ITC.ua · Чітко, як ніколи: команда Телескопа горизонту подій опублікувала найдетальніше зображення чорної діриЧорні діри — одні з найпотужніших сил у Всесвіті, на які вперше вдалось поглянути
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Prof Heino Falcke

News Alert: New image of the famous supermassive black hole in M87. The image was taken a year later and reveals the same rings size and shadow shape, confirming our results from 2019! The intensity maximum has rotated however. Not surprising, since matter rotates around a black hole. It is actually now, where you expect it to be.

It quacks like a BH, it looks like a BH, it is a BH!

Paper in A&A: aanda.org/articles/aa/abs/2024

#astrodon#blackhole#astronomy
Daniel Fischer

First Sagittarius A* #EventHorizonTelescope Results - six looong papers now out:
arxiv.org/abs/2311.08680
arxiv.org/abs/2311.08679
arxiv.org/abs/2311.09479
arxiv.org/abs/2311.08697
arxiv.org/abs/2311.09478
arxiv.org/abs/2311.09484

arXiv.orgFirst Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky WayWe present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A$^*$), the Galactic center source associated with a supermassive black hole. These observations were conducted in 2017 using a global interferometric array of eight telescopes operating at a wavelength of $λ=1.3\,{\rm mm}$. The EHT data resolve a compact emission region with intrahour variability. A variety of imaging and modeling analyses all support an image that is dominated by a bright, thick ring with a diameter of $51.8 \pm 2.3$\,\uas (68\% credible interval). The ring has modest azimuthal brightness asymmetry and a comparatively dim interior. Using a large suite of numerical simulations, we demonstrate that the EHT images of Sgr A$^*$ are consistent with the expected appearance of a Kerr black hole with mass ${\sim}4 \times 10^6\,{\rm M}_\odot$, which is inferred to exist at this location based on previous infrared observations of individual stellar orbits as well as maser proper motion studies. Our model comparisons disfavor scenarios where the black hole is viewed at high inclination ($i > 50^\circ$), as well as non-spinning black holes and those with retrograde accretion disks. Our results provide direct evidence for the presence of a supermassive black hole at the center of the Milky Way galaxy, and for the first time we connect the predictions from dynamical measurements of stellar orbits on scales of $10^3-10^5$ gravitational radii to event horizon-scale images and variability. Furthermore, a comparison with the EHT results for the supermassive black hole M87$^*$ shows consistency with the predictions of general relativity spanning over three orders of magnitude in central mass.
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Prof Heino Falcke

New results from the #EventHorizonTelescope: Detection of event horizon scale circular polarization (CP) in the supermassive black hole in M87.

We can tell it is there, but we have a hard time imaging it. So, this is a first step only. Modeling suggests that this CP comes from Faraday conversion, which is not unexpected. The models support the paradigm that magnetic fields are dynamically important (and lead to the formation of jets).

#Astrodon #Astronomy #BlackHoles

phys.org/news/2023-11-supermas

Fraser Cain

Here's What it Would Take to See a Black Hole's Photon Ring

In 2019, the Event Horizon Telescope gave us the first-ever image of a black hole's event horizon, revealing the area around the heart of M87. The event horizon is the closest we've seen to a black hole, but not the closest we can see. That would be the photon ring, where light itself is pulled into orbit around the black hole. To build an observatory that can see the photon ring, we'll have to extend the Event Horizon Telescope to space, creating an even larger virtual telescope that might include the Earth and various Lagrange points.

#eventhorizontelescope

arxiv.org/abs/2309.17127

Fraser Cain

Astronomers are Hoping the Event Horizon Telescope saw Pulsars Near the Milky Way's Supermassive Black Hole

The Event Horizon Telescope is a collection of radio telescopes across the globe that simultaneously gathered data about the Milky Way's supermassive black hole, acting as a single telescope the size of planet Earth. This revealed the galaxy's heart in unprecedented detail, helping to confirm the black hole's event horizon and prove some of Einstein's predictions about General Relativity. But if those observations happened to contain any signals from pulsars in the area, it would allow for even more precise measurements, as if there were atomic clocks orbiting Sgr A*.

#eventhorizontelescope

arxiv.org/abs/2308.15381

Prof Heino Falcke

The #EventHorizonTelescope #EHT uses the big ALMA in Chile among others. Every year we have to apply for observing time there and it can be turned down. Nice to hear that observations for next year are approved - and we will attempt serious 345 GHz observations for the first time. That will give in principle the highest resolution black hole observations ever (if everything goes well). But it will be tough due to atmosphere and more limited number of telescopes. #Astronomy #Astrodon #blackholes

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