Variable accretion of stellar winds onto Sgr A*

Jorge Cuadra, Sergei Nayakshin

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We report a 3-dimensional numerical study of the accretion of stellar winds onto Sgr A*, the super-massive black hole at the centre of our Galaxy. Compared with previous investigations, we allow the stars to be on realistic orbits, include the recently discovered slow wind sources, and allow for optically thin radiative cooling. We frst show the strong inflience of the stellar dynamics on the accretion onto the central black hole. We then present more realistic simulations of Sgr A* accretion and frid that the slow winds shock and rapidly cool, forming cold gas clumps and flaments that coexist with the hot X-ray emitting gas. The accretion rate in this case is highly variable on time-scales of tens to hundreds of years. Such variability can in principle lead to a strongly non-linear response through accretion fbw physics not resolved here, making Sgr A* an important energy source for the Galactic centre.

Original languageEnglish
Article number068
Pages (from-to)436-442
Number of pages7
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - 1 Dec 2006
Externally publishedYes


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