A Multi-band Study of the remarkable Jet in Quasar 4C+19.44

D.E. Harris, N.P. Lee, D.A. Schwartz, A. Siemiginowska, F. Massaro, Mark Birkinshaw, Diana Worrall, C.C. Cheung, J.M. Gelbord, Svetlana G Jostad, Alan P Marscher, H. Landt, H. Marshall, E.S. Perlman, L. Stawarz, Y. Uchiyama, C.M. Urry

Research output: Contribution to journalArticle (Academic Journal)peer-review

9 Citations (Scopus)
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Abstract

We present arc-second-resolution data in the radio, IR, optical and X-ray for 4C+19.44 (=PKS 1354+195), the longest and straightest quasar jet with deep X-ray observations. We report results from radio images with half to one arc-second angular resolution at three frequencies, plus HST and Spitzer data. The Chandra data allow us to measure the X-ray spectral index in 10 distinct regions along the 18 arcsec jet and compare with the radio index. The radio and X-ray spectral indices of the jet regions are consistent with a value of α=0.80 throughout the jet, to within 2 sigma uncertainties. The X-ray jet structure to the south extends beyond the prominent radio jet and connects to the southern radio lobe, and there is extended X-ray emission in the direction of the unseen counter jet and coincident with the northern radio lobe. This jet is remarkable since its straight appearance over a large distance allows the geometry factors to be taken as fixed along the jet. Using the model of inverse Compton scattering of the cosmic microwave background (iC/CMB) by relativistic electrons, we find that the magnetic field strengths and Doppler factors are relatively constant along the jet. If instead the X-rays are synchrotron emission, they must arise from a population of electrons distinct from the particles producing the radio synchrotron spectrum.
Original languageEnglish
Article number119
Number of pages18
JournalAstrophysical Journal
Volume846
Issue number2
Early online date8 Sep 2017
DOIs
Publication statusPublished - 10 Sep 2017

Keywords

  • radiation mechanisms:
  • non-thermal — quasars
  • individual (4C+19.44) — galaxies
  • jets — galaxies
  • active

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