The Knotty Question of the Jet of PKS B1421-490

JM Gelbord, HL Marshall, DM Worrall, M Birkinshaw, JEJ Lovell, R Ojha, L Godfrey, DA Schwartz, ES Perlman, M Georganopoulos, DW Murphy, DL Jauncey

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

8 Citations (Scopus)


We report the discovery of unusually strong optical and X-ray emission associated with a knot in the radio jet of PKS B1421-490. The knot is the brightest feature observed beyond the radio band, with knot/core flux ratios 300 and 3.7 at optical and X-ray frequencies, respectively. We interpret the extreme optical output of the knot as synchrotron emission. The nature of the X-ray emission is unclear. We consider a second synchrotron component, inverse Compton emission from a relativistic, decelerating jet, and the possibility that this feature is a chance superposition of an unusual BL Lac object.
Translated title of the contributionThe Knotty Question of the Jet of PKS B1421-490
Original languageEnglish
Pages (from-to)L75 - L78
Number of pages4
JournalAstrophysical Journal
Publication statusPublished - 2005

Bibliographical note

Publisher: University of Chicago Press


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