Probing the Physics of Narrow-line Regions in Active Galaxies. IV. Full Data Release of the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)

Abstract

We present the second and final data release of the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7). Data are presented for 63 new galaxies not included in the first data release, and we provide 2D emission-line fitting products for the full S7 sample of 131 galaxies. The S7 uses the WiFeS instrument on the ANU 2.3m telescope to obtain spectra with a spectral resolution of R = 7000 in the red (540 -700 nm) and R = 3000 in the blue (350 -570 nm), over an integral field of 25 × 38 arcsec 2 with 1 × 1 arcsec 2 spatial pixels. The S7 contains both the largest sample of active galaxies and the highest spectral resolution of any comparable integral field survey to date. The emission-line fitting products include line fluxes, velocities and velocity dispersions across the WiFeS field of view, and an artificial neural network has been used to determine the optimal number of Gaussian kinematic components for emission-lines in each spaxel. Broad Balmer lines are subtracted from the spectra of nuclear spatial pixels in Seyfert 1 galaxies before fitting the narrow lines. We bin nuclear spectra and measure reddening-corrected nuclear fluxes of strong narrow lines for each galaxy. The nuclear spectra are classified on optical diagnostic diagrams, where the strength of the coronal line [Fe VII] λ6087 is shown to be correlated with [O III]/ Hβ. Maps revealing gas excitation and kinematics are included for the entire sample, and we provide notes on the newly observed objects.

GASP – XIX. AGN and their outflows at the centre of jellyfish galaxies

“…Ferguson et al (1997); Komossa & Schulz (1997) showed that multi-component photoionization models, where emission lines are produced in an ensemble of clouds with different gas densities and distances from the center, are able to successfully fit the observed values: in particular, in these models coronal lines are mostly produced by hot (T ∼ 10 5 K) gas heated by the AGN in the high-ionization inner regions (see also Mazzalay et al 2010). Thomas et al (2017) reported the existence of a correlation between [Fe VII]λ6087/Hα and [OIII]λ5007/Hβ in Seyfert galaxies in their sample, that they interpreted as an effect of a radiation pressure dominated environment, where Compton heating in the central regions triggers the production of coronal lines (Davies et al 2016). Consistently, both JO201 and JO135 show a high [OIII]λ5007/Hβ (> 10) ratio in the inner regions where the emission of [FeVII] is observed.…”

A new diagnostic to separate line emission from star formation, shocks, and AGNs simultaneously in IFU data

“…We use data from the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7; Thomas et al 2017). The S7 is an IFU survey conducted between 2013 and 2016.…”

“…In particular, the high spectral resolution (R ∼ 7000 in the red, 3000 in the blue) allows the study of independent velocity components in the emission lines, providing more information on shocked regions (Ho et al 2014). For a full explanation of the S7, see Thomas et al (2017).…”

Separating line emission from star formation, shocks, and AGN ionization in NGC 1068

“…In particular, the high spectral resolution (R ∼ 7000 in the red, 3000 in the blue) allows the study of independent velocity components in the emission lines, providing more information on shocked regions (Ho et al 2014). Full details of the S7, including wavelength ranges and selection criteria, can be found in Dopita et al (2015a) and Thomas et al (2017).…”