Astrophys. J., Suppl. Ser., 226, 19-19 (2016/October-0)
Far-infrared line spectra of active galaxies from the Herschel/PACS spectrometer: the complete database.
FERNANDEZ-ONTIVEROS J.A., SPINOGLIO L., PEREIRA-SANTAELLA M., MALKAN M.A., ANDREANI P. and DASYRA K.M.
Abstract (from CDS):
We present a coherent database of spectroscopic observations of far-IR fine-structure lines from the Herschel/Photoconductor Array Camera and Spectrometer archive for a sample of 170 local active galactic nuclei (AGNs), plus a comparison sample of 20 starburst galaxies and 43 dwarf galaxies. Published Spitzer/IRS and Herschel/SPIRE line fluxes are included to extend our database to the full 10-600 µm spectral range. The observations are compared to a set of Cloudy photoionization models to estimate the above physical quantities through different diagnostic diagrams. We confirm the presence of a stratification of gas density in the emission regions of the galaxies, which increases with the ionization potential of the emission lines. The new [O iv]25.9\mum/[O iii]88\mum versus [Ne iii]15.6\mum/[Ne ii]12.8\mum diagram is proposed as the best diagnostic to separate (1) AGN activity from any kind of star formation and (2) low-metallicity dwarf galaxies from starburst galaxies. Current stellar atmosphere models fail to reproduce the observed [O iv]25.9\mum/[O iii]88\mum ratios, which are much higher when compared to the predicted values. Finally, the ([Ne iii]15.6\mum + [Ne ii]12.8\mum)/([S iv]10.5\mum +[S iii]18.7\mum) ratio is proposed as a promising metallicity tracer to be used in obscured objects, where optical lines fail to accurately measure the metallicity. The diagnostic power of mid- to far-infrared spectroscopy shown here for local galaxies will be of crucial importance to study galaxy evolution during the dust-obscured phase at the peak of the star formation and black hole accretion activity (1<z<4). This study will be addressed by future deep spectroscopic surveys with present and forthcoming facilities such as the James Webb Space Telescope, the Atacama Large Millimeter/submillimeter Array, and the Space Infrared telescope for Cosmology and Astrophysics.
© 2016. The American Astronomical Society. All rights reserved.
galaxies: active - galaxies: dwarf - galaxies: ISM - galaxies: nuclei - galaxies: Seyfert - galaxies: starburst - galaxies: starburst
VizieR on-line data:
<Available at CDS (J/ApJS/226/19): table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat table11.dat refs.dat>
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