What Evidence Supports Sagittarius A* as a Supermassive Black Hole?

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SUMMARY

Sagittarius A* is widely accepted as a supermassive black hole, supported by observational evidence such as redshift measurements obtained through Very Long Baseline Interferometry (VLBI) and the Event Horizon Telescope. The discussion highlights the need for further evidence, particularly concerning dipole radiation and magnetic fields, as proposed in alternative models. Current efforts by the Event Horizon Telescope to enhance their VLBI network aim to provide more definitive measurements regarding the event horizon. The ongoing research is crucial for solidifying the understanding of Sagittarius A* as a black hole.

PREREQUISITES
  • Understanding of supermassive black holes
  • Familiarity with redshift measurements and their implications
  • Knowledge of Very Long Baseline Interferometry (VLBI)
  • Awareness of the Event Horizon Telescope and its methodologies
NEXT STEPS
  • Research the latest findings from the Event Horizon Telescope regarding Sagittarius A*
  • Explore the implications of redshift measurements in black hole studies
  • Investigate alternative models of black holes and their supporting evidence
  • Learn about the techniques used in VLBI and their applications in astrophysics
USEFUL FOR

Astronomers, astrophysicists, and students interested in black hole research and observational astrophysics will benefit from this discussion.

EinsteinKreuz
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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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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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