Journal article
Winds as the origin of radio emission in z=2.5 radio-quiet extremely red quasars
Monthly notices of the Royal Astronomical Society, v 477(1), pp 830-844
01 Jun 2018
Abstract
Most active galactic nuclei (AGNs) are radio quiet, and the origin of their radio emission is not well understood. One hypothesis is that this radio emission is a byproduct of quasar driven winds. In this paper, we present the radio properties of 108 extremely red quasars (ERQs) at z = 2-4. ERQs are among the most luminous quasars (L-bol similar to 10(47-48) erg s(-1)) in the Universe, with signatures of extreme (>> 1000 km s(-1)) outflows in their [O III]lambda 5007 angstrom emission, making them the best subjects to seek the connection between radio and outflow activities. All ERQs but one are unresolved in the radio on similar to 10 kpc scales, and the median radio luminosity of ERQs is nu L-nu[6 GHz] = 10(41.0) erg s(-1), in the radio-quiet regime, but 1-2 orders of magnitude higher than that of other quasar samples. The radio spectra are steep, with a mean spectral index = -1.0. In addition, ERQs neatly follow the extrapolation of the low-redshift correlation between radio luminosity and the velocity dispersion of [O III] emitting ionized gas. Uncollimated winds, with a power of one per cent of the bolometric luminosity, can account for all these observations. Such winds would interact with and shock the gas around the quasar and in the host galaxy, resulting in acceleration of relativistic particles and the consequent synchrotron emission observed in the radio. Our observations support the picture in which ERQs are signposts of extremely powerful episodes of quasar feedback, and quasar-driven winds as a contributor of the radio emission in the intermediate regime of radio luminosity nu L-nu = 10(39)-10(42) erg s(-1).
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Details
- Title
- Winds as the origin of radio emission in z=2.5 radio-quiet extremely red quasars
- Creators
- Hsiang-Chih Hwang - Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USANadia L. Zakamska - Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USARachael M. Alexandroff - Dunlap Institute for Astronomy and Astrophysics, The University of Toronto, Toronto, ON M5S 3H4, CanadaFred Hamann - University of FloridaJenny E. Greene - Princeton UniversitySerena Perrotta - University of California, RiversideGordon T. Richards - Drexel University
- Publication Details
- Monthly notices of the Royal Astronomical Society, v 477(1), pp 830-844
- Publisher
- Oxford Univ Press
- Number of pages
- 15
- Grant note
- Johns Hopkins University via the Catalyst Award GO6-17100X; NAS8-03060 / National Aeronautics and Space Administration through Chandra Award by the Chandra X-ray Observatory Center Postdoctoral Fellowship - Natural Science and Engineering Research Council of Canada
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000432660300059
- Scopus ID
- 2-s2.0-85046665428
- Other Identifier
- 991019169000204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics