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Title:
Red synchrotron jets in Parkes quasars
Authors:
Whiting, M. T.; Webster, R. L.; Francis, P. J.
Affiliation:
AA(Astrophysics Group, School of Physics, University of Melbourne, Victoria 3010, Australia), AB(Astrophysics Group, School of Physics, University of Melbourne, Victoria 3010, Australia), AC(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 0200, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 323, Issue 3, pp. 718-732. (MNRAS Homepage)
Publication Date:
05/2001
Origin:
MNRAS
MNRAS Keywords:
RADIATION MECHANISMS: NON-THERMAL, BL LACERTAE OBJECTS: GENERAL, GALAXIES: JETS, QUASARS: GENERAL
DOI:
10.1046/j.1365-8711.2001.04287.x
Bibliographic Code:
2001MNRAS.323..718W

Abstract

We present model fits to spectral energy distributions in the optical and near-infrared of >100 flat-spectrum radio quasars from the Parkes Half-Jansky Flat-spectrum Sample. We find that ~40 per cent of the sources have power-law spectral energy distributions (SEDs), while a similar number show evidence for two primary components: a blue power law and optical synchrotron emission. The blue power law is similar to the dominant component observed in the spectra of optically selected quasars. There is strong evidence that the synchrotron component has a turnover in the ultraviolet-optical rest frame of the spectrum. In the remaining sources, it is likely that the synchrotron peaks at longer wavelengths. This mixture of two components is supported by optical polarization measurements in a subgroup of the sources. The sources with power-law SEDs show evidence for an excess number of red power-law slopes compared with optically selected quasars. There are additional spectral components in some of the sources, such as dust and the underlying galaxy, which have not been considered here.

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