2013年8月29日 · The center of the Milky Way galaxy, with the supermassive black hole Sagittarius A* (Sgr A*), located in the middle, is revealed in these images. As described in our press release, astronomers have used NASA’s Chandra X-ray Observatory to take a major step in understanding why material around Sgr A* is extraordinarily faint in X-rays.

2022年5月12日 · The creation of the Sgr A* image used a similar process: the effort combined the work of over 300 researchers at 80 international institutions and eight telescopes across the globe (one more than for M87). In addition to developing complex tools to overcome the challenges of imaging Sgr A*, the team worked rigorously for five years, using ...

2022年5月12日 · Sagittarius A*, often abbreviated to Sgr A* and pronounced "Sagittarius A star", is a supermassive black hole located at the center of our spiral galaxy, the Milky Way.

Sagittarius A* First image of Sagittarius A* (or Sgr A* for short), the supermassive black hole at the centre of the Milky Way Galaxy. This image provided the first direct visual evidence of the presence of this black hole. It was captured by the Event Horizon Telescope (EHT), an array of eight radio observatories across the world linked to form a single “Earth-sized” virtual telescope.

2022年5月12日 · As Sgr A* is 1,500 times smaller than M87*, its speeding light is much harder to resolve. (Similarly, it’s harder to photograph a dog chasing its tail than one running at the same speed around a large park.) The fact that Sgr A* lies in our own galaxy also presented an imaging challenge. M87* sits in a galaxy that is offset from our own ...

2022年5月12日 · This strongly suggested that this object — known as Sagittarius A* (Sgr A*, pronounced "sadge-ay-star") — is a black hole, and today’s image provides the first direct visual evidence of it. Although we cannot see the black hole itself, because it is completely dark, glowing gas around it reveals a telltale signature: a dark central region ...

2024年10月29日 · The EHT study of Sgr A* resulting in the 2022 image release was the first detailed attempt to map the region around the black hole. The EHT consortium is working on improvements to produce better and more detailed interferometry images of this and other black holes. Eventually, that should result in more accurate views.

2025年1月21日 · Sgr A*'s presence creates a wild, turbulent region of space, with a huge torus of dust roiling around the supermassive black hole. Astronomers don't know what causes the flares in the region, but simulations suggest that it's an interaction between magnetic field lines in the disk of material that most closely orbits the black hole.

4 天之前 · Slim filaments seen in the CMZ of the Milky Way around the supermassive black hole Sgr A* by the ALMA telescope. (Image credit: Yang et al.) Astronomers don't currently know for sure how these ...

2025年2月28日 · Hourly timescale variable emission of Sgr A* has been detected at radio, (sub)millimeter, near-IR, and X-ray frequencies, suggesting similarly-present emission in this portion of the electromagnetic spectrum. However, the sensitivity and angular resolution of available mid-IR telescopes were insufficient to detect Sgr A* until the launch of ...