Relativistic X-ray jets at high redshift

Daniel A Schwartz, Aneta Siemiginowska, Diana M Worrall, Mark Birkinshaw, Teddy Cheung, Herman Marshall, Guilia Migliori, John Wardle, Doug Gobeille

Research output: Contribution to journalArticle (Academic Journal)


Powerful radio sources and quasars emit relativistic jets of plasma and magnetic fields that travel hundreds of kilo-parsecs, ultimately depositing energy into the intra- or inter-cluster medium. In the rest frame of the jet, the energy density of the cosmic microwave background is enhanced by the bulk Lorentz factor squared, and when this exceeds the magnetic energy density the primary loss mechanism of the relativistic electrons is via inverse Compton scattering. The microwave energy density is also enhanced by a factor (1+z)^4, which becomes important at large redshifts. We are using Chandra to survey a z>3 sub-sample of radio sources selected with 21 cm wavelength flux density > 70 mJy, and with a spectroscopic redshift. Out of the first 12 objects observed, there are two clear cases of the X-rays extending beyond the detectable radio jet.
Original languageEnglish
Number of pages6
JournalAstronomische Nachrichten
Publication statusAccepted/In press - 31 Dec 2018

Bibliographical note

6 pages, 4 figures. In proceedings of the IWARA 2018 conference, to be published in Astronomische Nachrichten


  • astro-ph.HE


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