NASA | SAO | MSFC | Chandra X-ray Observatory | 2017 Mar 13
This graphic features an artist's impression of a star found in the closest orbit known around a black hole, as reported in our latest press release. This discovery was made using data from NASA's Chandra X-ray Observatory (shown in the inset where low, medium, and high-energy X-rays are colored red, green, and blue respectively), plus NASA's NuSTAR telescope and the Australia Telescope Compact Array.
Astronomers found this extraordinarily close stellar pairing in the globular cluster named 47 Tucanae, a dense collection of stars located on the outskirts of the Milky Way galaxy, about 14,800 light years from Earth.
This particular source, known as X9, has been of interest to scientists for many years. Until a couple of years ago, astronomers thought X9 contained a white dwarf pulling material from a companion star like the Sun. However, a team of scientists in 2015 used radio data to show that X9 likely consisted instead of a black hole pulling gas from a white dwarf companion. These researchers predicted that the white dwarf would take only about 25 minutes to orbit the black hole. ...
Star Discovered in Closest Known Orbit Around Black Hole
Michigan State University | 2017 Mar 13
Star in Closest Orbit Ever Seen Around Black Hole
International Center for Radio Astronomy Research | 2017 Mar 13
The Ultracompact Nature of the Black Hole Candidate X-ray Binary 47 Tuc X9 - Arash Bahramian et al
- Monthly Notices of the RAS 467(2):2199 (May 2017) DOI: 10.1093/mnras/stx166
arXiv.org > astro-ph > arXiv:1702.02167 > 07 Feb 2017