Skip navigation
Skip navigation

Relativistic jet feedback - II. Relationship to gigahertz peak spectrum and compact steep spectrum radio galaxies

Bicknell, Geoffrey; Mukherjee, Dipanjan; Wagner, Alexander; Sutherland, Ralph; Nesvadba, Nicole

Description

We propose that Gigahertz Peak Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources are the signposts of relativistic jet feedback in evolving galaxies. Our simulations of relativistic jets interacting with a warm, inhomogeneous medium, utilizing cloud densities and velocity dispersions in the range derived from optical observations, show that free-free absorption can account for the ~ GHz peak frequencies and low-frequency power laws inferred from the radio observations. These new...[Show more]

dc.contributor.authorBicknell, Geoffrey
dc.contributor.authorMukherjee, Dipanjan
dc.contributor.authorWagner, Alexander
dc.contributor.authorSutherland, Ralph
dc.contributor.authorNesvadba, Nicole
dc.date.accessioned2021-03-16T00:57:51Z
dc.date.available2021-03-16T00:57:51Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/227205
dc.description.abstractWe propose that Gigahertz Peak Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources are the signposts of relativistic jet feedback in evolving galaxies. Our simulations of relativistic jets interacting with a warm, inhomogeneous medium, utilizing cloud densities and velocity dispersions in the range derived from optical observations, show that free-free absorption can account for the ~ GHz peak frequencies and low-frequency power laws inferred from the radio observations. These new computational models replace a power-law model for the free-free optical depth a more fundamental model involving disrupted log-normal distributions of warm gas. One feature of our new models is that at early stages, the low-frequency spectrum is steep but progressively flattens as a result of a broader distribution of optical depths, suggesting that the steep low-frequency spectra discovered by Callingham et al. may possibly be attributed to young sources. We also investigate the inverse correlation between peak frequency and size and find that the initial location on this correlation is determined by the average density of the warm ISM. The simulated sources track this correlation initially but eventually fall below it, indicating the need for a more extended ISM than presently modelled. GPS and CSS sources can potentially provide new insights into the phenomenon of AGN feedback since their peak frequencies and spectra are indicative of the density, turbulent structure, and distribution of gas in the host galaxy.
dc.description.sponsorshipThis research was supported by the Australian Research Council through the Discovery Project, DP140103341 The Key Role of Black Holes in Galaxy Evolution. We acknowledge substantial grants of supercomputing time from the National Merit Allocation Scheme and the Australian National University (ANU) Merit Allocation Scheme.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherBlackwell Publishing Ltd
dc.rights© 2018 The Author(s)
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectISM: jets and outflows
dc.subjectgalaxies: evolution
dc.subjectradio continuum: galaxies.
dc.titleRelativistic jet feedback - II. Relationship to gigahertz peak spectrum and compact steep spectrum radio galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume475
dcterms.dateAccepted2018-01-02
dc.date.issued2018-04
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationa383154xPUB9805
local.publisher.urlhttps://academic.oup.com/
local.type.statusPublished Version
local.contributor.affiliationBicknell, Geoffrey, College of Science, ANU
local.contributor.affiliationMukherjee, Dipanjan, College of Science, ANU
local.contributor.affiliationWagner, Alexander, College of Science, ANU
local.contributor.affiliationSutherland, Ralph, College of Science, ANU
local.contributor.affiliationNesvadba, Nicole, Centre Universitaire d'Orsay Institute of Spacial Astrophysics
dc.relationhttp://purl.org/au-research/grants/arc/DP140103341
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage3493
local.bibliographicCitation.lastpage3501
local.identifier.doi10.1093/mnras/sty070
dc.date.updated2020-11-23T11:52:35Z
local.identifier.scopusID2-s2.0-85046031478
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."Published version can be made open access on institutional repository" from SHERPA/RoMEO site (as at 16.3.21)
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Bicknell_Relativistic_jet_feedback_-_2018.pdf6.99 MBAdobe PDFThumbnail


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator