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Understanding X-ray Binary Populations in Galaxies: Insights from Recent Studies

This research explores the populations of X-ray binaries (XRBs) in nearby galaxies, focusing on their luminosity functions, evolutionary pathways, and the relationships between XRBs' properties and star formation rates (SFR). Studies highlight how different accretion mechanisms contribute to the formation of high-mass (HMXBs) and low-mass (LMXBs) X-ray binaries, as well as the impact of binary interactions over stellar lifetimes. The findings inform our understanding of star formation and the cosmic evolution of galaxies, underlining the importance of X-ray observations in astrophysics.

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Understanding X-ray Binary Populations in Galaxies: Insights from Recent Studies

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  1. Populations of (bright) compact sources in galaxies Marat Gilfanov MPA, Garching

  2. Hans-Jakob Grimm (CfA) Igor Prokopenko (IKI) Pavel Shtykovskiy (IKI/MPA) Rashid Sunyaev (MPA/IKI) Rasmus Voss (MPA, MPE) Akos Bogdan (MPA) X-rays from nearby galaxies, 5/9/2007

  3. Binary evolution wind accretion or Roche lobe overflow “primordial” binary MS+MS HMXB stellar evolution massive star: stellar evolution ~2-40 Myrs 50 Myrs Roche lobe overflow LMXB SN explosion low-mass star: stellar evolution or orbital decay BH/NS+MS 1-10 Gyrs X-rays from nearby galaxies, 5/9/2007

  4. Lx-mass relation for LMXBs total X-ray luminosity number of sources X-rays from nearby galaxies, 5/9/2007

  5. Lx-SFR relation for HMXBs number of sources total X-ray luminosity Nx~SFR Lx~SFR Non-physical effect of statistics of small numbers Ltot=Lk X-rays from nearby galaxies, 5/9/2007

  6. Total luminosity of XRBs Lx ~ 2•1039SFR 8•1038M* Nx(Lx>1037) ~ 7SFR 10M* [SFR]= M/yr [M*]=1010 M X-rays from nearby galaxies, 5/9/2007

  7. Luminosity functions X-rays from nearby galaxies, 5/9/2007

  8. HMXBs X-ray luminosity functions: SFR~0.15-7 Msun/yr X-rays from nearby galaxies, 5/9/2007

  9. HMXBs X-ray luminosity functions scaled to the same SFR SFR~0.15-7 Msun/yr X-rays from nearby galaxies, 5/9/2007

  10. HMXB & LMXB luminosity functions • different shapes - different accretion regimes: • HMXB - wind accretion • LMXB - Roche-lobe overflow • “true” ULXs are associated with star-formation • no features at LEdd for NS - ??? X-rays from nearby galaxies, 5/9/2007

  11. HMXB XLF & IMF slope accretion of radiation pressure driven stellar wind X-rays from nearby galaxies, 5/9/2007

  12. LMXB XLF gravitational braking in longer Porb systems magnetic braking(Sco X-1 etc.) Evolved companionand/or Gravitational braking in ultracompact binaries NS+WD, Porb~10 min short life-time problem King, Bildsten, Postnov and others X-rays from nearby galaxies, 5/9/2007

  13. Faint sources (old populations) number of sources contribution to total luminosity ~3% Sazonov et al., 2006Revnivtsev et al., 2006 X-rays from nearby galaxies, 5/9/2007

  14. How abundant are X-ray binaries?Nx(Lx>1037) ~ 7SFR 10M* X-rays from nearby galaxies, 5/9/2007

  15. Abundance of HMXBs number of HMXBs observed at any given time: duration of HMXB phase number of HMXB birth rate of compact objects HMXB fraction X-rays from nearby galaxies, 5/9/2007

  16. Abundance of HMXBs number of HMXBs observed at any given time : Salpeter IMF: Nx-SFR relation: X-rays from nearby galaxies, 5/9/2007

  17. Abundance of HMXBs O,B binaries: HMXB~104-105 yrs X/Be binaries: HMXB~105-106 (?) yrs X-rays from nearby galaxies, 5/9/2007

  18. Abundance of LMXBs Per 1010 Msun: Salpeter IMF: ~7.4107 BH & NS LMXB-Mstar relation: NLMXB(LX>1035)~50 LMXBs X-rays from nearby galaxies, 5/9/2007

  19. Time dependence of XRB populations LX , NX HMXB LMXB has been measured (Pavel Shtykovsky’s talk) 50-100 Myr >1 Gyr log(time) SF event X-rays from nearby galaxies, 5/9/2007

  20. HMXBs and the spiral structure X-ray sources in M51 (Chandra) distance to spiral arms HST image of M51 stars Beckwith, 2005 (low stat. significance) X-rays from nearby galaxies, 5/9/2007

  21. X-ray binaries and CXB X-rays from nearby galaxies, 5/9/2007

  22. X-ray binaries and CXB Cosmic star formation stellar mass (from Nagamine et al., 2006) X-rays from nearby galaxies, 5/9/2007

  23. X-ray binaries and CXB <zHMXB> ~ 1.5 <zLMXB> ~ 0.5 2-10 keV: HMXB ~7-10% LMXB <1-2% X-rays from nearby galaxies, 5/9/2007

  24. HMXBs & unresolved part of CXB HMXB contribution can explain ~50% of the unresolved part of the CXB (via contribution of faint normal galaxies) X-rays from nearby galaxies, 5/9/2007

  25. LMXBs: primordial and dynamically formed(talk of Rasmus Voss for details) X-rays from nearby galaxies, 5/9/2007

  26. LMXBs in M31 primordial total tidal capture in the bulge GC X-rays from nearby galaxies, 5/9/2007

  27. LMXBs in M31 X-rays from nearby galaxies, 5/9/2007

  28. LMXBs in M31 luminosity functions X-rays from nearby galaxies, 5/9/2007

  29. Andromeda galaxy (M31) Images: 5 X-rays from nearby galaxies, 5/9/2007

  30. The End X-rays from nearby galaxies, 5/9/2007

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