Exploring Sagittarius A*: Supermassive Black Hole Evidence

In summary, there is a question about Sagittarius A*, which is believed to be a supermassive Black Hole by astrophysicists. However, an alternative model was proposed four years ago and the question is if there is any observational evidence to support it. This includes detection of dipole radiation or evidence of an internally generated magnetic field. Additionally, there are measurements of redshift near Sagittarius A* that have been made using VLBI, and these suggest the presence of an event horizon. The Event Horizon Telescope is currently working on adding more VLBI stations to further study this phenomenon."
  • #1
EinsteinKreuz
64
1
So I have a question about Sagittarius A*, which more and more astrophysicists are certain is a supermassive Black Hole. But now for the evidence part:

1. An alternative model for this object was proposed http://journalofcosmology.com/RobetsonLeiter.pdf published 4 years ago. So is there any observational evidence to support this? Like detection of dipole radiation of evidence of an internally generated magnetic field(magnetic moment)?

2. In terms of the redshift near Sagittarius A* measured by VLBI(google Event Horizon Telescope for futher details), have actual measurements been made that suggest that there is infinite redshift which indicates the presence of an event horizon beyond a resonable doubt?
 
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  • #2
The event horizon telescope have early results, but the seem to be busy adding VLBI stations at the moment (that's what they put on their homepage anyway).
Here is an oldish lecture about it:
 
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Related to Exploring Sagittarius A*: Supermassive Black Hole Evidence

1. What is Sagittarius A*?

Sagittarius A* is a supermassive black hole located at the center of our Milky Way galaxy. It is estimated to have a mass of about 4 million times that of our sun.

2. How do we know that Sagittarius A* is a black hole?

Scientists have observed the effects of Sagittarius A*'s immense gravitational pull on nearby stars and gas clouds. This evidence points to the presence of a supermassive black hole at the center of the galaxy.

3. What is the significance of exploring Sagittarius A*?

Studying Sagittarius A* can help us better understand the nature of black holes and their role in shaping galaxies. It can also provide insights into the formation and evolution of our own galaxy.

4. How do scientists explore Sagittarius A*?

Scientists use a variety of techniques to explore Sagittarius A*, including observations with telescopes that detect different wavelengths of light, such as infrared and X-ray. They also use computer simulations and mathematical models to study the behavior of matter and energy around the black hole.

5. Are there any current missions or projects focused on Sagittarius A*?

Yes, there are several ongoing projects and missions that are dedicated to studying Sagittarius A*. Some examples include the Event Horizon Telescope, which captured the first-ever image of a black hole in 2019, and the Galactic Center Orbits Initiative, which is studying the orbits of stars around Sagittarius A* to learn more about its properties.

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