‘Amazing’ hot gas bubble spotted slithering around the Milky Way’s supermassive black hole

Hot gas bubble orbiting the supermassive black hole

Astronomers have noticed indicators of a “scorching spot” orbiting round Sagittarius A*, the black gap on the heart of our galaxy.

Astronomers have noticed indicators of a ‘scorching spot’ orbiting round Sagittarius A*, and[{” attribute=””>black hole at the center of our galaxy, using the Atacama Large Millimeter/submillimeter Array (

The Orbit of the Hot Spot Around Sagittarius A*

This shows a still image of the supermassive black hole Sagittarius A*, as seen by the Event Horizon Collaboration (EHT), with an artist’s illustration indicating where the modeling of the ALMA data predicts the hot spot to be and its orbit around the black hole. Credit: EHT Collaboration, ESO/M. Kornmesser (Acknowledgment: M. Wielgus)

The observations were made with ALMA in the Chilean Andes, during a campaign by the Event Horizon Telescope (EHT) Collaboration to image black holes. ALMA is — a radio telescope co-owned by the European Southern Observatory (ESO). In April 2017 the EHT linked together eight existing radio telescopes worldwide, including ALMA, resulting in the recently released first-ever image of Sagittarius A*. To calibrate the EHT data, Wielgus and his colleagues, who are members of the EHT Collaboration, used ALMA data recorded simultaneously with the EHT observations of Sagittarius A*. To the research team’s surprise, there were more clues to the nature of the black hole hidden in the ALMA-only measurements.

Utilizing ALMA, astronomers have discovered a scorching bubble of fuel orbiting Sagittarius A*, the black gap on the heart of our galaxy, at 30% the velocity of sunshine.

By likelihood, some observations had been made shortly after an explosion or glow of X-ray power was emitted from the middle of our galaxy, which was noticed by[{” attribute=””>NASA’s Chandra X-ray Observatory. These kinds of flares, previously observed with X-ray and infrared telescopes, are thought to be associated with so-called ‘hot spots’, hot gas bubbles that orbit very fast and close to the black hole.

“What is really new and interesting is that such flares were so far only clearly present in X-ray and infrared observations of Sagittarius A*. Here we see for the first time a very strong indication that orbiting hot spots are also present in radio observations,” says Wielgus, who is also affiliated with the Nicolaus Copernicus Astronomical Center, in Warsaw, Poland and the Black Hole Initiative at Harvard University, USA.

This video exhibits an animation of a scorching spot, a bubble of scorching fuel, in orbit round Sagittarius A*, a black gap 4 million instances bigger than our Solar on the heart of our planet.[{” attribute=””>Milky Way. While the black hole (center) has been directly imaged with the Event Horizon Telescope, the gas bubble represented around it has not: its orbit and velocity are inferred from both observations and models. The team who discovered evidence for this hot spot — using the Atacama Large Millimeter/submillimeter Array (ALMA), in which

Credit: EHT Collaboration, ESO/L. Calçada (Acknowledgment: M. Wielgus)

“Perhaps these hot spots detected at infrared wavelengths are a manifestation of the same physical phenomenon: as infrared-emitting hot spots cool down, they become visible at longer wavelengths, like the ones observed by ALMA and the EHT,” adds Jesse Vos. He is a PhD student at Radboud University, the Netherlands, and was also involved in this study.

The flares were long thought to originate from magnetic interactions in the very hot gas orbiting very close to Sagittarius A*, and the new findings support this idea. “Now we find strong evidence for a magnetic origin of these flares and our observations give us a clue about the geometry of the process. The new data are extremely helpful for building a theoretical interpretation of these events,” says co-author Monika Moscibrodzka from Radboud University.

First Image of Our Black Hole Sagittarius A*

This is the first image of Sgr A*, the supermassive black hole at the center of our galaxy. It’s the first direct visual evidence of the presence of this black hole. It was captured by the Event Horizon Telescope (EHT), an array that linked together eight existing radio observatories across the planet to form a single “Earth-sized” virtual telescope. The telescope is named after the event horizon, the boundary of the black hole beyond which no light can escape. Credit: EHT Collaboration

ALMA allows astronomers to study polarized radio emission from Sagittarius A*, which can be used to unveil the black hole’s magnetic field. The team used these observations together with theoretical models to learn more about the formation of the hot spot and the environment it is embedded in, including the magnetic field around Sagittarius A*. Their research provides stronger constraints on the shape of this magnetic field than previous observations, helping astronomers uncover the nature of our black hole and its surroundings.

Milky Way Central Black Hole Location ALMA

This image shows the Atacama Large Millimeter/submillimeter Array (ALMA) looking up at the Milky Way as well as the location of Sagittarius A*, the supermassive black hole at our galactic center. Highlighted in the box is the image of Sagittarius A* taken by the Event Horizon Telescope (EHT) Collaboration. Located in the Atacama Desert in Chile, ALMA is the most sensitive of all the observatories in the EHT array, and ESO is a co-owner of ALMA on behalf of its European Member States. Credit: ESO/José Francisco Salgado (josefrancisco.org), EHT Collaboration

The observations confirm some of the previous discoveries made by the GRAVITY instrument at ESO’s

Milky Way Wide Field View

Wide-field view of the center of the Milky Way. This visible light wide-field view shows the rich star clouds in the constellation of Sagittarius (the Archer) in the direction of the center of our Milky Way galaxy. The entire image is filled with vast numbers of stars — but far more remain hidden behind clouds of dust and are only revealed in infrared images. This view was created from photographs in red and blue light and forming part of the Digitized Sky Survey 2. The field of view is approximately 3.5 degrees x 3.6 degrees. Credit: ESO and Digitized Sky Survey 2. Acknowledgment: Davide De Martin and S. Guisard (www.eso.org/~sguisard)

The team is also hoping to be able to directly observe the orbiting gas clumps with the EHT, to probe ever closer to the black hole and learn more about it. “Hopefully, one day, we will be comfortable saying that we ‘know’ what is going on in Sagittarius A*,” Wielgus concludes.

More information

Reference: “Orbital motion near Sagittarius A* – Constraints from polarimetric ALMA observations” by M. Wielgus, M. Moscibrodzka, J. Vos, Z. Gelles, I. Martí-Vidal, J. Farah, N. Marchili, C. Goddi and H. Messias, 22 September 2022, Astronomy & Astrophysics.
DOI: 10.1051/0004-6361/202244493

The team is composed of M. Wielgus (Max-Planck-Institut für Radioastronomie, Germany [MPIfR]; Nicholas Copernicus Astronomical Centre, Polish Academy of Sciences, Poland; The Black Gap Initiative at Harvard College, USA [BHI]), M. Moscibrodzka (Division of Astrophysics, Radboud College, The Netherlands [Radboud]), J. Vos (Radboud), Z. Gelles (Middle for Astrophysics | Harvard & Smithsonian, USA and BHI), I. Martí-Vidal (Universitat de València, Spain), J. Farah (Las Cumbres Observatory, USA; College from California, Santa Barbara, USA), N. Marchili (Italian Regional Middle ALMA, INAF-Istituto di Radioastronomia, Italy and MPIfR), C. Goddi (Dipartimento di Fisica, Università degli Studi di Cagliari, Italy and Universidade de São Paulo, Brazil), and H. Messias (ALMA Joint Observatory, Chile).

The Atacama Massive Millimeter/submillimeter Array (ALMA), a world astronomy facility, is a partnership between ESO, the US Nationwide Science Basis (NSF) and the Nationwide Institutes of Pure Sciences (NINS) of Japan in collaboration with the Republic of Chile. ALMA is funded by ESO on behalf of its member states, by NSF in collaboration with the Nationwide Analysis Council of Canada (NRC) and the Ministry of Science and Know-how (MOST) and by NINS in collaboration with Academia Sinica (AS) in Taiwan and the Korea Institute for Astronomy and Area Sciences (KASI). ). ALMA creation and operations are led by ESO on behalf of its member states; By the Nationwide Radio Astronomy Observatory (NRAO), operated by Related Universities, Inc. (AUI), on behalf of North America; And by the Nationwide Astronomical Observatory of Japan (NAOJ) on behalf of East Asia. The Joint ALMA Observatory (JAO) gives unified management and administration for the development, operation, and operation of ALMA.

The European Southern Observatory (ESO) permits scientists all over the world to find the secrets and techniques of the universe for the advantage of all. We design, construct and function world-class observatories on Earth – which astronomers use to deal with thrilling questions and unfold the magic of astronomy – and promote worldwide cooperation in astronomy. Based as an intergovernmental group in 1962, in the present day ESO helps 16 member states (Austria, Belgium, Czech Republic, Denmark, France, Finland, Germany, Eire, Italy, Netherlands, Poland, Portugal, Spain, Sweden, Switzerland, and the UK), Along with host nation Chile and with Australia as a strategic associate. The ESO headquarters, customer heart and planetarium, ESO Supernova, is situated close to Munich in Germany, whereas the Chilean Atacama Desert, an exquisite place with distinctive situations for observing the sky, hosts our telescopes. ESO operates three monitoring websites: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Massive Telescope and its Very Massive Telescope Interferometer, in addition to two infrared survey telescopes and the VLT visible-light survey telescope. Additionally in Paranal ESO will host and function the South Array Cherenkov Telescope, the world’s largest and most delicate gamma-ray observatory. Along with worldwide companions, ESO operates APEX and ALMA in Chajnantor, two millimeter and submillimeter sky monitoring amenities. At Cerro Armazones, close to Paranal, we’re constructing the “world’s largest eye on the sky” – ESO’s Very Massive Telescope. From our places of work in Santiago, Chile, we assist our operations within the nation and work with companions and the Chilean neighborhood.

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