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Minimum e Lorentz factor and matter content of jet in blazars

Minimum e Lorentz factor and matter content of jet in blazars. Qingwen Wu Huazhong University of Science and Technology, China Collaborators: S.-J. Kang & L. Chen Krakow-2015/4/24. 1. Why minimum electron Lorentz factor ?. Crucial for jet power estimation and

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Minimum e Lorentz factor and matter content of jet in blazars

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  1. Minimum e Lorentz factor and matter content of jet in blazars Qingwen Wu Huazhong University of Science and Technology, China Collaborators:S.-J. Kang & L. Chen Krakow-2015/4/24

  2. 1. Why minimum electron Lorentz factor ? Crucial for jet power estimation and constraint on jet matter content!

  3. Jet kinetic power Inhomogeneous jet model: VLBI core size, proper motion, X-ray (SSC) and with a assumed minimum electron Lorentz factor

  4. Gu et al.2009 MHD simulations on jet efficiency, e.g., Tchekhovskoy, Narayan … (2012)

  5. Constrain minimum electron Lorentz factor from observations? Celotti & Ghisellini 2008 Kang, Chen & Wu 2014

  6. 2) Sample & Model • Sample: 30 Low-Synchrotron-Peaked(LSP) blazars (FSRQs) with (quasi-)simultaneous observations (Fermi, Swift, Plank & ground based radio, optical, infrared telescopes). X-rays of LSP blazars are mainly dominated by SSC.

  7. 2) Sample & Model • Model: one-zone leptonic model IC: SSC + EC Seed photons for EC?

  8. 2) Sample & Model • Jet dissipation region & seed photon field ? Possibilities: (1) R < RBLR (2) RBLR< R< Rtorus (3) R > Rtorus ? ? Torus ? BLR

  9. 2) Sample & Model • Jet dissipation region & seed photon field Indirect test? Origin of seed photon field may provide a test on the gamma-ray location Ghisellini & Tavecchio 2009

  10. 2) Sample & Model • Model: one-zone leptonic model BLR and torus seed photons are considered in IC respectively.

  11. 2) Sample & Model • Model: one-zone leptonic model Model parameters: 7 free parameters Fitting method:

  12. 3) Results • Fitting results BLR Torus Fit the data from submm to Gamma-ray (e.g., > 300GHz) Giroletti’s talk: optically thin at >~86 GHz

  13. 3) Results • Doppler factor & Doppler factor Hovatta’s talk & works

  14. 3) Results • Seed photon field Klein-Nishina effect? It suggests that IR seed photons are preferred and RBLR < Rdissi < Rtorus.

  15. 3) Results • uBLR, uIR as a free parameter (but p1 or p2 fixed) Kang, Wu & Chen in prep log Pjet/LEdd log Pjet/LEdd IR seed photons are preferred? RBLR < Rdissi< Rtorus?

  16. 3) Results • Minimum electron Lorentz factor ~ several tens, which is not sensitive to seed photon field (SSC!). Sari et al. 1998

  17. 3) Results • Jet power & matter content One electron one proton, jet power of blazars is systematically larger than that of FR IIs at given 151 MHz radio luminosity. The jet power will decrease if positrons exist!

  18. 3) Results • Jet power & matter content Assume , and set Pjet=Pjet151, we get ne+/np~10

  19. 4) Conclusion • SED modeling with IR seed photon is better than that of BLR, which suggest that gamma-ray emitting region may locate outside of BLR. Most of jet energy is dissipated at 105Rg? M87 Asada et al. 2014 & Nakamura’s talk

  20. 4) Conclusion • SED modeling with IR seed photon is better than that of BLR, which suggest that gamma-ray emitting region may locate outside of BLR. • Minimum electron Lorentz factors are ~ several tens in FSRQs.

  21. 4) Conclusion • SED modeling with IR seed photon is better than that of BLR, which suggest that gamma-ray emitting region may locate outside of BLR. • Minimum electron Lorentz factors are ~ several tens in FSRQs. • Mixed composition of e+-e--p in FSRQs.

  22. 4) Conclusion • SED modeling with IR seed photon is better than that of BLR, which suggest that gamma-ray emitting region may locate outside of BLR. • Minimum electron Lorentz factors are ~ several tens in FSRQs. • Mixed composition of e+-e--p in FSRQs. Thanks for your attention!

  23. 2.5 Gamma-ray emitting region and jet composition in blazars Syn IC (SSC&EC) FSRQs BL Lacs LBL,IBLand HBL Multi-band SED normally can be modeled by one-zone model (size R~D*c*tmin, tmin~1 day).

  24. Possibilities: • (1) R < RBLR • (2) RBLR<R<Rtorus • (3) R > Rtorus ? ? ? Different locations will lead to different IC seed photons.

  25. SED modeling results BLR IR Support the IR soft photons -> located at R>~RBLR

  26. Blazar jet include positrons? e-/p Median value is 0.08, average value is 0.22 ne+/np ~10electron-positron dominated! Kang, Chen & Wu* 2014, ApJS

  27. MHD Jet efficiency Minimum electron Lorentz factor >> 1 ? But see Tchekhovskoy, Narayan … (2012) for a*~0.99 Hawley & Krolik 2006

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