Jump To Date
View By Semester
View By Series
Add An Event

Center for Astrophysics Research and Technologies Seminar Series Information


Events Calendar

Testing General Relativity Using a Star in a Tight Orbit around the Galactic Black Hole

Friday February 22, 2019
3:30 pm

 Presenter:  Mark Morris, UCLA
 Series:  Physics and Astronomy Colloquium
 Abstract:  Using adaptive optics observations with the Keck Telescopes, the UCLA Galactic center group has followed the orbit of the star S0-2 through its periapse passage close to the supermassive black hole at the Galactic center, where it was moving at 3% of the speed of light.  The radial velocity and astrometric measurements of this star’s orbit show good agreement with both special and general relativistic predictions, giving a test of GR in a strong gravity regime that had not been probed prior to this event.  With 24 years of monitoring the orbit of this star (and many others), the precision of the orbital determination is such that the distance to the Galactic center and the mass of the black hole are now determined with 1% and 1.5% accuracy, respectively.  We also place strong limits on the presence of unseen mass in the entourage of the black hole.
 Host:  Ylva Pihlström
 Location:  Room 125, Dane Smith Hall

Refreshments will be available before the colloquium, at 03:15 pm, in in the lobby of Dane Smith Hall.

Disability Notice Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Sandra Ortiz (phone: 505-277-5900, email: sportiz@unm.edu) well in advance to ensure your needs are accommodated. Event handouts can be provided in alternative accessible formats upon request. Please contact Ms. Ortiz if you need written information in an alternative format.