EDP Sciences
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Volume 419, Number 2, May IV 2004
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040132

A&A 419, L9-L12 (2004)
DOI: 10.1051/0004-6361:20040132


A possible feature of thermal matter in relativistic jets of radio-loud quasars

J.-M. Wang1, 2, 3, R. Staubert1 and T. J.-L. Courvoisier4, 5

1  Institut für Astronomie und Astrophysik, Abt. Astronomie, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
2  Laboratory for High Energy Astrophysics, Institute of High Energy Physics, CAS, Beijing 100039, PR China
3  Alexander von Humboldt Fellow
4  INTEGRAL Science Data Center, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
5  Geneva Observatory, 51 ch. des Maillettes, 1290 Sauverny, Switzerland

(Received 23 October 2003 / Accepted 4 April 2004)

It has been suggested that relativistic jets in quasars may contain a considerable amount of thermal matter. In this paper, we explore the possibility that the K $\alpha$ line from the thermal matter may appear at tens of keV due to a high Doppler blue-shift. In the jet comoving frame, the energy density of photons originally emitted by the accretion disk and reflected off the broad line region clouds dominates over that of photons of other origin. We discuss the photoionization states of the thermal matter and find that the irons elements are neutral. The high metallicity in quasars enhances the possibility to detect the thermal matter in the relativistic jet in some radio-loud quasars. A highly Doppler blue-shifted K $\alpha$ line may be detected. We make a prediction for 3C 273, in which the K $\alpha$ line luminosity might be of the order $3.0\times 10^{44} \;{\rm erg~s^{-1}}$ with an equivalent width of 2.4 keV. Such a line could be detected in a future mission.

Key words: galaxy: radio galaxies: active -- quasars -- individual: 3C 273

Offprint request: J.-M. Wang, wang@astro.uni-tuebingen.de

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