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Black Hole Formation and Kicks

Black Hole Formation and Kicks. Vicky Kalogera Physics & Astronomy Dept with Bart Willems Mike Henninger Todd Levin Natasha Ivanova and Chris Fryer (LANL) Frank Timmes (LANL). BH formation: some open questions … What is the mass relation between progenitors and BHs ?

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Black Hole Formation and Kicks

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  1. Black Hole Formation and Kicks Vicky Kalogera Physics & Astronomy Dept with Bart Willems Mike Henninger Todd Levin Natasha Ivanova and Chris Fryer (LANL) Frank Timmes (LANL)

  2. BH formation: some open questions … • What is the mass relation between progenitors and BHs ? • Are asymmetric birth kicks imparted to BHs ? • How do their magnitudes compare to NS kicks ? • Observed sample of BH X-ray binaries: • Growing in number • Exciting recent measurements of proper motion give us with radial velocity unique information on kinematic history (see F. Mirabel’s talk)

  3. primordial binary How do BH X-ray binaries form ? Common Envelope: orbital contraction and mass loss BH formation X-ray binary at Roche-lobe overflow courtesy Sky & Telescope Feb 2003 issue

  4. Use ALL observational constraints: Currently: donor position on the H-R diagram BH and donor masses *orbital period * 3-D center-of-mass velocity Calculations: 1. Identify MT sequences that satisfy H-R, masses, periodconstraints > obtain time of BH formation 2. Follow motion in the Galaxy > obtain post-collapse Vcm 3. Follow tidal evolution prior to XRB phase > obtain post-collapse A, e 4. Analyze collapse dynamics: constrainBH XRB progenitor and kick

  5. Example case: GRO J1655-40 Two sets of binary properties from: Beer & Podsiadlowski 2002 (BP) Greene, Bailyn, & Orosz 2001 (GBO) BH (Mo) Donor (Mo) SpT BP5.4+-0.3 1.45+-0.35 F5-G0 GBO 6.3+-0.5 2.4+-0.4 F6III Porb =2.62 d

  6. GRO J1655-40 (with BP parameters) Conservative MT: Sequences must satisfy constraints on current H-R position of the donor and …

  7. GRO J1655-40 Conservative MT: Sequences must satisfy constraints on current H-R position of the donor and …

  8. GRO J1655-40 … satisfy constraints on current BH and donor masses and most importantly orbital period BH chosen MT seq: 4.4Mo BH 2.4Mo donor 1.4d period donor time since BH formation: ~830Myr

  9. GRO J1655-40 :MT seq. that satisfy all constraints BP conservative BP non-conservative GBO conservative GBO non-conservative

  10. GRO J1655-40 :MT seq. that satisfy all constraints BH BP conservative BP non-conservative GBO conservative GBO non-conservative donor

  11. GRO J1655-40: Motion in the Galaxy (for BP conservative MT seq.) BH age ~ 830Myr ---> VPEC = 63-78 km/s

  12. GRO J1655-40 (for BP conservative MT seq.) VPEC, MBH, Mdonor, Aorb (or Porb), and e at BH formation constrain pre-collapse Aorb as well as the BH-progenitor mass and the possible BH kick magnitude

  13. GRO J1655-40 (for BP conservative MT seq.) MBH = 4.4 Mo from core-collapse hydro simulations: BH formation: delayed M0 >~ 6 Mo BH progenitor mass BH kick magnitude

  14. GRO J1655-40 conservative MT non-conservative MT BP GBO

  15. Conclusions on J1655-40: • BH progenitor in the range 4.5 - 14 Mo • BH kicks necessary; in the range of 30 - 200 km/s • delayed BH formation through fallback • Work in progress: • Analysis for XTE J1118-480 and Cyg X-1 is underway … • Are BH kicks correlated with either BH mass or • mass loss at BH formation ? • Comparison with NS systems Sco X-1, 4U1700-37, LS 5039 and more …

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