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A New Diagnostic to Separate Line Emission from Star Formation, Shocks, and AGN Simultaneously in IFU Data

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arxiv 1902.10295 v2 pith:NAWDQGNR submitted 2019-02-27 astro-ph.GA

A New Diagnostic to Separate Line Emission from Star Formation, Shocks, and AGN Simultaneously in IFU Data

classification astro-ph.GA
keywords emissionlineformationregionsseparateshocksstararising
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the optical spectra of galaxies, methods for the separation of line emission arising from star formation and an additional hard component, such as shocks or AGN, is well-understood and possible with current diagnostics. However, such diagnostics fail when attempting to separate and define line emission which arises from shocked gas, and that arising from AGN. We present a new three-dimensional diagnostic diagram for IFU data which can simultaneously separate the line emission amongst star formation, shocks, and AGN within a galaxy. We show that regions we define as AGN-dominated correlate well with the hard X-ray distribution in our test case NGC 1068, as well as with known regions of AGN activity in NGC 1068. Similarly, spaxels defined as shock-dominated correlate strongly with regions of high velocity dispersion within the galaxy.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. The evolution of the galaxy gas-phase mass-metallicity relation from $z=15$ to $z=0$ in the COLIBRE cosmological simulations

    astro-ph.GA 2026-06 unverdicted novelty 6.0

    COLIBRE simulations find the galaxy gas-phase MZR already in place at z≈10 with little evolution until z≈5, then shallowens at low z, with high-mass turnover set by AGN feedback and low-mass end by core-collapse supernovae.

  2. Dust destruction signals shock-accelerated outflows in the nearby active galaxy NGC 1068

    astro-ph.GA 2026-06 unverdicted novelty 5.0

    Line ratio diagnostics in NGC 1068 indicate AGN outflows are shock-accelerated, with outflowing gas dust-free and 19-110 times denser than disk gas.

  3. Dust destruction signals shock-accelerated outflows in the nearby active galaxy NGC 1068

    astro-ph.GA 2026-06 unverdicted novelty 4.0

    Line ratio diagnostics in NGC 1068 indicate that AGN outflows are accelerated by shocks that destroy dust and compress gas.