A Chandra detection of the radio hotspot of 3C 123

MJ Hardcastle*, M Birkinshaw, DM Worrall

*Corresponding author for this work

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

43 Citations (Scopus)

Abstract

Chandra X-ray Observatory observations of the powerful, peculiar radio galaxy 3C 123 have resulted in an X-ray detection of the bright eastern hotspot, with a 1-keV flux density of similar to 5nJy. The X-ray flux and spectrum of the hotspot are consistent with the X-rays being inverse-Compton scattering of radio synchrotron photons by the population of electrons responsible for the radio emission ('synchrotron self-Compton emission') if the magnetic fields in the hotspot are close to their equipartition values. 3C 123 is thus the third radio galaxy to show X-ray emission from a hotspot which is consistent with being in equipartition. Chandra also detects emission from a moderately rich cluster surrounding 3C 123, with L-X(2-10 keV) = 2 x 10(44) egr s(-1) and kT similar to 5 keV, and absorbed emission from the active nucleus, with an inferred intrinsic column density of 1.7 x 10(22) cm(-2) and an intrinsic 2-10 keV luminosity of 10(44) erg s(-1).

Original languageEnglish
Pages (from-to)17 - 22
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume323
Issue number2
DOIs
Publication statusPublished - 11 May 2001

Bibliographical note

Publisher: Blackwell Science
Other: Page number prefixed with "L"

Keywords

  • radiation mechanisms : non-thermal
  • galaxies : active
  • galaxies : individual : 3C 123
  • X-rays : galaxies
  • X-RAY-EMISSION
  • MAGNETIC-FIELD STRENGTHS
  • HOT-SPOTS
  • CYGNUS-A
  • SYNCHROTRON SPECTRA
  • GALAXY
  • PERSEUS

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