A Multiwavelength Study of the High Surface Brightness Hot Spot in PKS 1421-490

作者: M. Birkinshaw , M. Birkinshaw , E. S. Perlman , D. M. Worrall , D. M. Worrall

DOI: 10.1088/0004-637X/695/1/707

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摘要: Long Baseline Array imaging of the z = 0.663 broadline radio galaxy PKS 1421−490 reveals a 400 pc diameter high surface brightness hot spot at projected distance ∼40 kpc from active galactic nucleus. The isotropic X-ray luminosity spot, L2–10 keV 3 × 10 44 ergs s −1 , is comparable to entire jet 0637−752, and peak hundreds times greater than that brightest in Cygnus A. We model spectral energy distribution using one-zone synchrotron self-Compton with near equipartition magnetic field strength mG. There strong asymmetry between approaching receding hotspots spectrum remains flat (α ≈ 0.5) well beyond predicted cooling break for mG field, indicating hotspot emission may be Doppler beamed. A plasma velocity terminal shock could result dynamically important jet. change slope GHz frequencies, which we by incorporating cutoff electron γmin 650, higher values implied if show sharp decrease number density below Lorentz factor 650 would arise dissipation bulk kinetic an electron/proton Γjet 5.

参考文章(79)
D. Campbell-Wilson, R. W. Hunstead, Variable Radio Sources at 843 MHz Publications of the Astronomical Society of Australia. ,vol. 11, pp. 33- 38 ,(1994) , 10.1017/S1323358000019639
M. A. Aloy, J. Ma. Ibáñez, J. Ma. Martí, J.-L. Gómez, E. Müller, High--Resolution 3D Simulations of Relativistic Jets arXiv: Astrophysics. ,(1999) , 10.1086/312266
J. F. C. Wardle, D. C. Homan, R. Ojha, D. H. Roberts, Electron–positron jets associated with the quasar 3C279 Nature. ,vol. 395, pp. 457- 461 ,(1998) , 10.1038/26675
Olivia Tsang, John Kirk, The inverse Compton catastrophe and high brightness temperature radio sources Astronomy and Astrophysics. ,vol. 463, pp. 145- 152 ,(2007) , 10.1051/0004-6361:20066502
F. Tavecchio, R. Cerutti, L. Maraschi, R. M. Sambruna, J. K. Gambill, C. C. Cheung, C. Megan Urry, X-Ray and Optical Emission from Radio Hot Spots of Powerful Quasars The Astrophysical Journal. ,vol. 630, pp. 721- 728 ,(2005) , 10.1086/432371
J. P. Leahy, T. W. B. Muxlow, P. W. Stephens, 151-MHz and 1.5-GHz observations of bridges in powerful extragalactic radio sources Monthly Notices of the Royal Astronomical Society. ,vol. 239, pp. 401- 440 ,(1989) , 10.1093/MNRAS/239.2.401
K. R. Lind, R. D. Blandford, Semidynamical models of radio jets: relativistic beaming and source counts. The Astrophysical Journal. ,vol. 295, pp. 358- 367 ,(1985) , 10.1086/163380
Mark Birkinshaw, E. S. Perlman, J. M. Gelbord, H. L. Marshall, D. W. Murphy, D. A. Schwartz, J. E. J. Lovell, D. L. Jauncey, Diana M Worrall, A Chandra Survey of Quasar Jets: First Results Astrophysical Journal Supplement Series. ,vol. 156, pp. 13- 33 ,(2005) , 10.1086/425578
D. J. Saikia, C. H. Ishwara-Chandra, Relativistic beaming effects in the spectra of cores and hotspots in radio galaxies and quasars Monthly Notices of the Royal Astronomical Society. ,vol. 317, pp. 658- 666 ,(2000) , 10.1046/J.1365-8711.2000.03677.X