1 / 21

Tight L iso -E p -Γ 0 Relation of Long Gamma-Ray Bursts

Tight L iso -E p -Γ 0 Relation of Long Gamma-Ray Bursts. Enwei Liang Guangxi University, China. IAUS 324: New Frontiers in BH Astrophys. 2016.9.12-9.16, Ljubljana Selovenia. General Picture of Gamma-Ray Bursts. GRBs and their afterglows are produced from extremely relativistic jets

cdomenico
Download Presentation

Tight L iso -E p -Γ 0 Relation of Long Gamma-Ray Bursts

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Tight Liso-Ep-Γ0 Relation of Long Gamma-Ray Bursts Enwei Liang Guangxi University, China IAUS 324: New Frontiers in BH Astrophys. 2016.9.12-9.16, Ljubljana Selovenia

  2. General Picture of Gamma-Ray Bursts GRBs and their afterglows are produced from extremely relativistic jets powered by the central engine. V ≥ 0.9999c

  3. Estimating the Initial Γ0 of GRB jets With the fireball deceleration time(e.g.,Sari & Piran 1999) With the "compactness" argument: (e.g.,Lithwick & Sari 2001) With the photosphere radiation: (e.g. Zou + 2015) Liang + 2010 Tang + 2014 Peng + 2014

  4. Optical and X-ray afterglow Cartoon Lightcurves Optical Emission components X-ray Emission components Zhang et al. 2006, ApJ; Li, Liang et al. 2012, ApJ

  5. Relation between afterglow onset and prompt gamma-rays • Optical afterglow onset is detected for 1/3 of GRBs • Onset peak luminosity is correlated with prompt gamma-ray luminosity. Liang et al. 2010, ApJ

  6. Eiso (or Liso)-Γ0 Relation A tight correlation between the Eiso and the Lorentz factor of GRB fireball Liang et al. 2010，2013, ApJ; LV et al. 2012, ApJL

  7. Eiso (or Liso)-Ep Relation These relations was found with GRBs detected with BeppoSAX and also confirmed with Swift/BAT and Fermi/GBM GRBs. Lu et al. 2012, ApJ Amati et al. 2012, IJMPD Yonetoku et al. 2004, ApJ

  8. Eiso (or Liso)-Ep vs. Eiso (or Liso)-Γ0 Relation • Is the large intrinsic dispersion of pair correlations due to missing of the third part? • Relation among the three parameters? Liang et al. 2010, ApJ Amati et al. 2012, IJMPD

  9. A tight Liso-Ep,z-Γ0 relation GRB 060218: Γ0~ 2.3 （Soderberg + 2006） Liang + 2015, ApJ

  10. A tight Liso-Ep,z-Γ0relation Double check with GRBs whose Γ0 are derived from the spectral cutoff energy observed with Fermi/LAT. GRB 060218: Γ0~ 2.3 （Soderberg + 2006） Liang + 2015, ApJ

  11. Liso-Ep,z-Γ0as a new GRB cosmology ruler? • Ejet-Ep relation (Ghirlanda + 2004) • Eiso-Ep-tjet relation (Liang & Zhang 2005) Dai, Liang, & Xu 2004, ApJL； Liang & Zhang 2005, ApJ

  12. Liso-Ep,z-Γ0as a new GRB cosmology ruler? • Advantages: • A tighter relation than previous ones. • Issues: • Needing to be confirmed with LL-GRBs (moderate relativistic jets?) • Needing to geometric correction to Liso • Identifying the cosmic evolution of jet luminosity. ？ Liang + 2015; Xin + 2016

  13. 3. Our On-Going Observational Project GRB trigger Follow-up Fluxmagnitude GRBs Hu+ 2014 Optical Tels Singer+2012 R=13Mini-GWAC R=16GWAC R=1960/80cm R=21 iPTF -400s -200s 0 100s 5m 1h 1d

  14. Our Current Optical Monitoring Project 10m trigger Identification and early photometry Spectrum、redshift 30s Late photometry hours GWAC/GRB alert60/80cm Telescope2m telescope

  15. Examples of Our Monitoring Results Mini-GWAC upper limit : M=13.2 GRB 160131A B, V, R, I observations with our 60/ 80 cm telescopes in Xinglong Observatory. Liang+ 2016, in prep.

  16. GRB 140629 Xin+ 2016, ApJ, submitted

  17. Zhong + 2016, ApJ, in press

  18. Huang + 2016, ApJ, in press

  19. Xin + 2016a, ApJ

  20. Summary Thanks! • Measuring the jet initial Lorentz factors of GRBs with the fireball deceleration time observed in the optical band range from ~100 to 1000. • The Lorentz factors are correlated with Liso (or Eiso), and a tighter correlation is found by adding Ep. • The Liso-Ep,z-Γ0 may be a promising GRB cosmology ruler, but issues are still there. • Our new observational project is going on for pushing the cosmology use of this relation .

More Related