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Jet-Induced Emission-Line Nebulosity and Star Formation in the High-Redshift Radio Galaxy 4C 41.17

Bicknell, Geoffrey; Sutherland, Ralph; van Breugel, Willem Johannes Maria; Dopita, Michael; Dey, Arjun; Miley, George

Description

The high-redshift radio galaxy 4C 41.17 has been shown in earlier work to consist of a powerful radio source in which there is strong evidence for jet-induced star formation along the radio axis. We argue that nuclear photoionization is not responsible for the excitation of the emission line clouds, and we construct a jet-cloud interaction model to explain the major features revealed by the detailed radio, optical, and spectroscopic data of 4C 41.17. The interaction of a high-powered (∼ 1046...[Show more]

dc.contributor.authorBicknell, Geoffrey
dc.contributor.authorSutherland, Ralph
dc.contributor.authorvan Breugel, Willem Johannes Maria
dc.contributor.authorDopita, Michael
dc.contributor.authorDey, Arjun
dc.contributor.authorMiley, George
dc.date.accessioned2015-12-13T23:21:59Z
dc.date.available2015-12-13T23:21:59Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/91234
dc.description.abstractThe high-redshift radio galaxy 4C 41.17 has been shown in earlier work to consist of a powerful radio source in which there is strong evidence for jet-induced star formation along the radio axis. We argue that nuclear photoionization is not responsible for the excitation of the emission line clouds, and we construct a jet-cloud interaction model to explain the major features revealed by the detailed radio, optical, and spectroscopic data of 4C 41.17. The interaction of a high-powered (∼ 1046 ergs s-1) jet with a dense cloud in the halo of 4C 41.17 produces shock-excited emission-line nebulosity through ∼ 1000 km s-1 shocks and induces star formation. The C IV luminosity emanating from the shock implies that the preshock density in the line-emitting cloud is high enough (hydrogen density ∼ 1-10 cm-3) that shock-initiated star formation could proceed on a timescale (∼a few × 106 yr) well within the estimated dynamical age (∼ 3 × 107 yr) of the radio source. Broad (FWHM ≈ 1100-1400 km s-1) emission lines are attributed to the disturbance of the gas cloud by a partial bow shock, and narrow emission lines (FWHM ≈ 500-650 km s-1; in particular, C IV λλ1548, 1550) arise in precursor emission in relatively low-metallicity gas or in shocked line emission in the lateral regions of the bow shock. The implied baryonic mass ∼ 8 × 1010 M⊙ of the cloud is high and implies that Milky Way size condensations existed in the environments of forming radio galaxies at a redshift of 3.8. Our interpretation of the data provides a physical basis for the alignment of the radio, emission-line, and UV continuum images in some of the highest redshift radio galaxies, and the analysis presented here may form a basis for the calculation of densities and cloud masses in other high-redshift radio galaxies.
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Galaxies: individual (4C 41.17); Galaxies: ISM; Galaxies: jets; Galaxies: structure; Stars: formation
dc.titleJet-Induced Emission-Line Nebulosity and Star Formation in the High-Redshift Radio Galaxy 4C 41.17
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume540
dc.date.issued2000
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub21914
local.type.statusPublished Version
local.contributor.affiliationBicknell, Geoffrey, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSutherland, Ralph, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationvan Breugel, Willem Johannes Maria, University of California
local.contributor.affiliationDopita, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationDey, Arjun, National Optical Astronomy Observatory
local.contributor.affiliationMiley, George, Leiden University
local.bibliographicCitation.startpage678
local.bibliographicCitation.lastpage686
dc.date.updated2015-12-12T09:09:28Z
local.identifier.scopusID2-s2.0-0034633028
CollectionsANU Research Publications

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