Astronomy & Astrophysics

Free access article

A&A 385, L27-L30 (2002)
DOI: 10.1051/0004-6361:20020278

Letter

X-rays from the jet in 3C 273 : Clues from the radio-optical spectra

S. Jester¹, H.-J. Röser¹, K. Meisenheimer¹ and R. Perley²

¹ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
² NRAO, PO Box 0, Socorro, NM 87801, USA

(Received 18 January 2002 / Accepted 21 February 2002)

Abstract
Using new deep VLA and HST observations of the large-scale jet in 3C 273 matched to 0 $\farcs$ 3 resolution, we have detected excess near-ultraviolet emission ( $\lambda\,300\mbox{${\rm\ts\,nm}$ }$ ) above a synchrotron cutoff spectrum accounting for the emission from radio through optical ( $\lambda\lambda 3.6\mbox{${\rm\ts cm}$ }$ - $620\mbox{${\rm\ts\,nm}$ }$ ). This necessitates a two-component model for the emission. The radio-optical-X-ray spectral energy distributions suggest a common origin for the UV excess and the X-rays from the jet.

Key words: galaxies: jets -- quasars: individual: 3C 273 -- radiation mechanisms: non-thermal

Offprint request: S. Jester, jester@mpia.de

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