Intimate Life in the Galactic Center ASCI/Alliances Center for Astrophysical Thermonuclear Flashes Sgr A* and Sgr A East Intimate Life in the Galactic Center Tomasz Plewa ASCI Flash Center, University of Chicago Michal Rozyczka Copernicus Astronomical Center, Warsaw December 3, 2001 in 2.5D December 3, 2001

Galactic Center Trivia distance ~8 kpc extinction several 10s in V linear size of Sgr A*: 0.76 mas (6.2x1013 cm) December 3, 2001

GC on 100s pc scale December 3, 2001

Gaseous component December 3, 2001

X-ray emission of molecular gas no powerful ionizing sources December 3, 2001

Young helium stars December 3, 2001

Central object December 3, 2001

Accretion from * winds December 3, 2001

Sgr A*/Sgr A East December 3, 2001

Model characteristics Uniform medium Optically thin cooling, 3 times solar metallicity Gravitational equilibrium for the ambient gas Static gravitational potential, m=2.6x106 solar Cylindrical 2.5D geometry Adaptive mesh refinement, ~650002 zones, 2.5 mas, 10-4 pc, 2.8x1014 cm, 300 Rg December 3, 2001

One-dimensional models December 3, 2001

Two-dimensional models December 3, 2001

Luminosity and accretion rates December 3, 2001

Conclusions vicinity of the central region appears to be dominated by Sgr A East; uncertain role of stellar winds size constraint favors low-density background with interaction beginning ~13 000 years after SN explosion violent interaction approaching a quasi-steady with a stream-like accretion rapid rise in luminosity; high-luminosity state lasting for several hundred years thermal emission peaking in hard X-rays with total luminosity in the range of 1039-1040 ergs range depending on the background density December 3, 2001