Message Boards Message Boards


Stars orbiting Sagittarius A*: evidence​ for a black hole

Posted 9 months ago
2 Replies
16 Total Likes

POSTED BY: Jeff Bryant
2 Replies

enter image description here -- you have earned Featured Contributor Badge enter image description here Your exceptional post has been selected for our editorial column Staff Picks and Your Profile is now distinguished by a Featured Contributor Badge and is displayed on the Featured Contributor Board. Thank you!

POSTED BY: Moderation Team

I finally looked at one of the major source papers, An Update on Monitoring Stellar Orbits in the Galactic Center, Astrophysical Journal.

"We use a fitting code we developed in Mathematica (Wolfram Research, Inc. 2016), which calculates the positions and velocities by explicitly integrating the orbits, and then uses the built-in minimization routines to find the best fitting parameters. These routines are based on standard techniques such as quasi-Newton methods, steepest gradient search, or the Levenberg–Marquardt algorithm. Usually, we apply different search algorithms iteratively, until none is able to improve the minimum further."

Reply to this discussion
Community posts can be styled and formatted using the Markdown syntax.
Reply Preview
or Discard

Group Abstract Group Abstract