Mon. Not. R. Astron. Soc., 475, 1485-1507 (2018/April-1)
The Star Formation Reference Survey - II. Activity demographics and host-galaxy properties for infrared-selected galaxies.
MARAGKOUDAKIS A., ZEZAS A., ASHBY M.L.N. and WILLNER S.P.
Abstract (from CDS):
We present activity demographics and host-galaxy properties of infrared-selected galaxies in the local Universe, using the representative Star Formation Reference Survey (SFRS). Our classification scheme is based on a combination of optical emission-line diagrams (BPT) and infrared (IR)-colour diagnostics. Using the weights assigned to the SFRS galaxies based on its parent sample, a far-IR-selected sample comprises 71 per cent H II galaxies, 13 per cent Seyferts, 3 per cent transition objects (TOs), and 13 per cent low-ionization nuclear emission-line regions (LINERs). For the SFRS H II galaxies, we derive nuclear star formation rates and gas-phase metallicities. We measure host-galaxy metallicities for all galaxies with available long-slit spectroscopy and abundance gradients for a subset of 12 face-on galaxies. The majority of H II galaxies show a narrow range of metallicities, close to solar, and flat metallicity profiles. Based on their host-galaxy and nuclear properties, the dominant ionizing source in the far-infrared selected TOs is star-forming activity. LINERs are found mostly in massive hosts (median of 1010.5 M☉), median L(60 µm) = 109 L☉, median dust temperatures of F60/F100 = 0.36, and median L_H α_ surface density of 1040.2 erg s–1kpc–2, indicating older stellar populations as their main ionizing source rather than active galactic nucleus activity.
© 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: abundances - galaxies: nuclei - galaxies: Seyfert - galaxies: starburst - galaxies: star formation
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