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Lookup NU author(s): Dr Vicky FawcettORCiD, Dr David Rosario
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
A non-negligible fraction of quasars are red at optical wavelengths, indicating (in the majority of cases) that the accretion disc is obscured by a column of dust which extinguishes the shorter-wavelength blue emission. In this paper, we summarize recent work by our group, where we find fundamental differences in the radio properties of SDSS optically-selected red quasars. We also present new analyses, using a consistent color-selected quasar parent sample matched to four radio surveys (FIRST, VLA Stripe 82, VLA COSMOS 3 GHz, and LoTSS DR1) across a frequency range 144 MHz–3 GHz and four orders of magnitude in radio flux. We show that red quasars have enhanced small-scale radio emission (∼kpc) that peaks around the radio-quiet threshold (defined as the ratio of 1.4 GHz luminosity to 6 micron luminosity) across the four radio samples. Exploring the potential mechanisms behind this enhancement, we rule out star-formation and propose either small-scale synchrotron jets, frustrated jets, or dusty winds interacting with the interstellar medium; the latter two scenarios would provide a more direct connection between opacity (dust; gas) and the production of the radio emission. In our future study, using new multi-band uGMRT data, we aim to robustly distinguish between these scenarios.
Author(s): Fawcett VA, Alexander DM, Rosario DJ, Klindt L, Fotopoulou S, Lusso E, Morabito LK, Calistro Rivera G
Publication type: Article
Publication status: Published
Journal: MDPI Galaxies
Year: 2021
Volume: 9
Issue: 4
Print publication date: 01/12/2021
Online publication date: 19/11/2021
Acceptance date: 16/11/2021
Date deposited: 18/10/2022
ISSN (electronic): 2075-4434
Publisher: MDPI
URL: https://doi.org/10.3390/galaxies9040107
DOI: 10.3390/galaxies9040107
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