Transient x ray binaries in centaurus a
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Transient X-ray Binaries In Centaurus A. 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

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Transient X-ray Binaries In Centaurus A

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Transient x ray binaries in centaurus a

Transient X-ray Binaries In Centaurus A

Gregory R. Sivakoff (UVa)Chandra CenA-Very Large Project Team

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


Transient x ray binaries in centaurus a

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


X ray binary variability

X-ray Binary Variability

  • Soft X-ray Transients

    • Disk Instability + Irradiation + Disk Size

King 2006

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


X ray binary variability1

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)

GX339-4

Aql X1

EXO1745-248

1×1038

LX,0.3-10 kev (erg/s)

5×1037

2001

2003

2001

2003

2001

2003

Year

Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii


Galactic extragalactic studies of xrbs are complementary

Galactic/Extragalactic Studies ofXRBs are Complementary

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


Transient x ray binaries in centaurus a

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


Transient x ray binaries in centaurus a

2000 May 17

2007 May 08

2007 May 30

2002 Sep 03

2003 Sep 14

1999 Dec 05

2007 Mar 27

2007 Mar 22

2007 Mar 30

2007 Apr 17

Mar. 4, 2010: HEAD Meeting, Waikoloa, Hawaii


The importance of being variable

The Importance Of Being Variable

Steep Power Law State

Thermal State

Sivakoff et al. 2008 + Updates

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


Gx 339 4 like sources

GX 339-4 Like Sources?

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


But persistence dominates

But, Persistence Dominates

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


In many galaxies

… In Many Galaxies

NGC 4697: Sivakoff et al.

NGC 4365: Sivakoff et al.

Accretion Processes in X-Rays:From White Dwarfs to Quasars


In many galaxies1

… In Many Galaxies

Accretion Processes in X-Rays:From White Dwarfs to Quasars


Where do we go from here

Where Do We Go From Here?

  • Fainter Sources, Month-Year Timescales

  • Brighter Sources, Decade Timescales

XLF of 14 E/SOs: Kim & Fabbiano 2003

Accretion Processes in X-Rays:From White Dwarfs to Quasars


Where do we go from here1

Where Do We Go From Here?

Chandra X-ray Observatory

  • Fainter Sources, Month-Year Timescales

  • Brighter Sources, Decade Timescales

Accretion Processes in X-Rays:From White Dwarfs to Quasars


Where do we go from here2

Where Do We Go From Here?

LX,0.3-10 kev (erg/s)

  • Fainter Sources, Month-Year Timescales

  • Bright Sources, Decade Timescales

  • Week Timescales

AQL X-1

1×1038

5×1037

2001

2003

Year

Accretion Processes in X-Rays:From White Dwarfs to Quasars


Where do we go from here3

Where Do We Go From Here?

Wide FieldX-ray Telescope

  • Fainter Sources, Month-Year Timescales

  • Bright Sources, Decade Timescales

  • Week Timescales

Accretion Processes in X-Rays:From White Dwarfs to Quasars


Take away points

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 XRBsAre Long Timescale Transients?

    • Accretion Theory Is Missing Something?

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


Thank you

Thank You

Thank You

July 15, 2010: Accretion WorkshopCambridge, Massachusetts


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