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Starburst-AGN mixing: I. NGC 7130

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arxiv 1402.0493 v1 pith:CRNCZ2SQ submitted 2014-02-03 astro-ph.GA astro-ph.CO

Starburst-AGN mixing: I. NGC 7130

classification astro-ph.GA astro-ph.CO
keywords starburst-agnactivitystarformationmixingemissionfieldfraction
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present an integral field spectroscopic study of the Luminous Infrared Galaxy (LIRG) NGC 7130, a known starburst-AGN composite galaxy. We employ standard emission line ratio diagnostics and maps of velocity dispersion and velocity field to investigate how the dominant ionising 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% respectively, and that the fraction of H-alpha luminosity due to star formation and AGN activity is 65 +/- 3% and 35 +/- 2% respectively. We conclude with a discussion of the importance and potential of starburst-AGN mixing for future studies of the starburst-AGN connection.

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