Transient X-ray Binaries In Centaurus A July 15, 2010: Accretion Workshop Cambridge, Massachusetts Gregory R. Sivakoff (UVa) Chandra Cen A-Very Large Project Team

A Galaxy’s Cookbook A Population of X-Ray Binaries Start With A Galaxy’s Stellar IMF –# NSs/BHs Stir In Stellar Dynamics –# Binaries Form Bake With Stellar Evolution & Binary Evolution For A Few Million/Billion Years –# HMXBS/LMXBs Form Top With Accretion Physics –# XRBs Emitting At A Given L X July 15, 2010: Accretion Workshop Cambridge, Massachusetts

King 2006 X-ray Binary Variability Soft X-ray Transients Disk Instability + Irradiation + Disk Size

X-ray Binary Variability Soft X-ray Transients Disk Instability + Irradiation + Disk Size Most Outbursts Are Short, But Some > 10 yr (e.g., GRS1915, KS1731) Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii Aql X1EXO GX Year L X, kev (erg/s) 5× ×10 3 8

Galactic/Extragalactic Studies of XRBs are Complementary GalacticExtragalactic Sensitivity For Quiescent XRBS Active XRBs Active XRBs Orbital Param.Some KnownMostly Unknown AbsorptionVariable ColumnConstant Column Distance~1/3 KnownSame / gal. Field-Of-ViewAll-SkyChandra-Sized Sample SizeLimited10s – 100s per gal. July 15, 2010: Accretion Workshop Cambridge, Massachusetts

Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii 1999 Dec May Sep Sep Mar Mar Mar Apr May May 30

The Importance Of Being Variable Sivakoff et al Updates Steep Power Law StateThermal State July 15, 2010: Accretion Workshop Cambridge, Massachusetts

GX Like Sources? July 15, 2010: Accretion Workshop Cambridge, Massachusetts

But, Persistence Dominates July 15, 2010: Accretion Workshop Cambridge, Massachusetts

NGC 4697: Sivakoff et al. NGC 4365: Sivakoff et al. … In Many Galaxies Accretion Processes in X-Rays: From White Dwarfs to Quasars

… In Many Galaxies Accretion Processes in X-Rays: From White Dwarfs to Quasars

Where Do We Go From Here? Fainter Sources, Month-Year Timescales Brighter Sources, Decade Timescales Accretion Processes in X-Rays: From White Dwarfs to Quasars XLF of 14 E/SOs: Kim & Fabbiano 2003

Where Do We Go From Here? Fainter Sources, Month-Year Timescales Brighter Sources, Decade Timescales Accretion Processes in X-Rays: From White Dwarfs to Quasars Chandra X-ray Observatory

Where Do We Go From Here? Fainter Sources, Month-Year Timescales Bright Sources, Decade Timescales Week Timescales Accretion Processes in X-Rays: From White Dwarfs to Quasars L X, kev (erg/s) 5× × Year AQL X-1

Where Do We Go From Here? Fainter Sources, Month-Year Timescales Bright Sources, Decade Timescales Week Timescales Accretion Processes in X-Rays: From White Dwarfs to Quasars Wide Field X-ray Telescope

Take-Away Points There Is A Wealth Of XRB Data In Cen A Variability Reveals Black Hole Candidates Sources Largely Persistent Sources Largely NS XRBs? Missing Short Timescale Transient XRBs? BH XRBs Are Long Timescale Transients? Accretion Theory Is Missing Something? July 15, 2010: Accretion Workshop Cambridge, Massachusetts

Thank You July 15, 2010: Accretion Workshop Cambridge, Massachusetts