Starburst-AGN mixing-I. NGC 7130

Rebecca L. Davies*, Jeffrey A. Rich, Lisa J. Kewley, Michael A. Dopita

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    56 Citations (Scopus)

    Abstract

    We present an integral field spectroscopic study of the luminous infrared galaxy NGC 7130, a known starburst-active galactic nucleus (AGN) composite galaxy. We employ standard emission-line ratio diagnostics and maps of velocity dispersion and velocity field to investigate how the dominant ionizing sources change as a function of radius. From the signatures of both star formation and AGN activity we show that NGC 7130 is a remarkably clean case of starburst-AGN mixing. We find a smooth transition from AGN-dominated emission in the centre to pure star-forming activity further out, from which we can estimate the radius of the extended narrow line region to be 1.8 ± 0.8 kpc. We calculate that the fraction of [OIII] luminosity due to star formation and AGN activity is 30 ± 2 and 70 ± 3 per cent, respectively, and that the fraction of Hα luminosity due to star formation and AGN activity is 65 ± 3 and 35 ± 2 per cent, respectively. We conclude with a discussion of the importance and potential of starburst-AGN mixing for future studies of the starburst-AGN connection.

    Original languageEnglish
    Pages (from-to)3835-3846
    Number of pages12
    JournalMonthly Notices of the Royal Astronomical Society
    Volume439
    Issue number4
    DOIs
    Publication statusPublished - Apr 2014

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