Centaurus A July 15 2010 Accretion Workshop Cambridge Massachusetts Gregory R Sivakoff UVa Chandra Cen A Very Large Project Team A Galaxys Cookbook A Population of XRay Binaries ID: 778604
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Slide1
Transient X-ray Binaries In
Centaurus
A
July 15, 2010: Accretion WorkshopCambridge, Massachusetts
Gregory R. Sivakoff (
UVa
)
Chandra
Cen
A-
Very Large Project Team
Slide2A Galaxy’s Cookbook
A Population of X-Ray Binaries
Start With A Galaxy’s Stellar IMF
#
NSs/BHs
Stir In Stellar Dynamics# Binaries FormBake With Stellar Evolution & Binary Evolution For A Few Million/Billion Years# HMXBS/LMXBs FormTop With Accretion Physics# XRBs Emitting At A Given LX
July 15, 2010: Accretion Workshop
Cambridge, Massachusetts
Slide3July 15, 2010: Accretion WorkshopCambridge, Massachusetts
King 2006
X-ray Binary Variability
Soft X-ray Transients
Disk Instability + Irradiation + Disk Size
Slide4X-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 X1EXO1745-248GX339-4200120032001
2003
2001
2003
Year
L
X,0.3-10
kev
(erg/
s
)
5×10
37
1×10
38
Slide5Galactic/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 Workshop
Cambridge, Massachusetts
Slide6July 15, 2010: Accretion Workshop
Cambridge, Massachusetts
Slide7Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii
1999 Dec 05
2000 May 17
2002 Sep 03
2003 Sep 14
2007 Mar 272007 Mar 222007 Mar 302007 Apr 172007 May 082007 May 30
Slide8The Importance Of Being Variable
Sivakoff et al. 2008 + Updates
Steep Power Law State
Thermal State
July 15, 2010: Accretion Workshop
Cambridge, Massachusetts
Slide9GX 339-4 Like Sources?
July 15, 2010: Accretion Workshop
Cambridge, Massachusetts
Slide10But, Persistence Dominates
July 15, 2010: Accretion Workshop
Cambridge, Massachusetts
Slide11NGC 4697: Sivakoff et al.
NGC 4365: Sivakoff et al.
… In Many
Galaxies
Accretion Processes in X-Rays:
From White Dwarfs to Quasars
Slide12… In Many
Galaxies
Accretion Processes in X-Rays:From White Dwarfs to Quasars
Slide13Where 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
Slide14Where 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
Slide15Where Do We Go From Here?
Fainter Sources, Month-Year Timescales
Bright Sources, Decade Timescales
Week TimescalesAccretion Processes in X-Rays:From White Dwarfs to Quasars
L
X,0.3-10 kev (erg/s)5×10371×103820032001YearAQL X-1
Slide16Where Do We Go From Here?
Fainter Sources, Month-Year Timescales
Bright Sources, Decade Timescales
Week TimescalesAccretion Processes in X-Rays:From White Dwarfs to Quasars
Wide Field
X-ray Telescope
Slide17Take-Away Points
There Is A Wealth Of XRB Data In
Cen A
Variability Reveals Black Hole CandidatesSources Largely PersistentSources 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
Slide18Thank You
Thank You
July 15, 2010: Accretion Workshop
Cambridge, Massachusetts