Transient X-ray Binaries In Centaurus A July 15, 2010: Accretion Workshop Cambridge, Massachusetts...
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Transient X-ray Binaries In Centaurus A
July 15, 2010: Accretion WorkshopCambridge, 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 LX
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
King 2006
X-ray Binary Variability
Soft X-ray Transients Disk Instability + Irradiation + Disk Size
Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii
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)
Aql X1 EXO1745-248GX339-4
2001 2003 2001 2003 2001 2003YearL
X,0
.3-1
0 k
ev (
erg
/s)
5×1037
1×1038
Galactic/Extragalactic Studies ofXRBs are Complementary
Galactic Extragalactic
Sensitivity For Quiescent XRBSActive XRBs Active XRBs
Orbital Param. Some Known Mostly Unknown
Absorption Variable Column Constant Column
Distance ~1/3 Known Same / gal.
Field-Of-View All-Sky Chandra-Sized
Sample Size Limited 10s – 100s per gal.
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii
1999 Dec 052000 May 172002 Sep 032003 Sep 142007 Mar 272007 Mar 222007 Mar 302007 Apr 172007 May 082007 May 30
The Importance Of Being Variable
Sivakoff et al. 2008 + Updates
Steep Power Law StateThermal State
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
GX 339-4 Like Sources?
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
But, Persistence Dominates
July 15, 2010: Accretion WorkshopCambridge, 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,0
.3-1
0 k
ev (
erg
/s)
5×1037
1×1038
20032001 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 FieldX-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 WorkshopCambridge, Massachusetts
Thank You
Thank You
July 15, 2010: Accretion WorkshopCambridge, Massachusetts