Probing the Physics of Narrow Line Regions in Active Galaxies. Ii. The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)

Dopita, Michael A.; Shastri, P.; Davies, R. L.; Kewley, Lisa J.; Hampton, Elise; Scharwächter, J.; Sutherland, Ralph S.; Kharb, P.; Jose, Jessy; Bhatt, H. C.; Ramya, S.; Jin, Chichuan; Banfield, Julie; Zaw, I.; Juneau, Stéphanie; James, Bethan L.; Srivastava, Shweta

doi:10.1088/0067-0049/217/1/12

Cited by 72 publications

(90 citation statements)

References 114 publications

(205 reference statements)

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“…The sample consists of 47 Sy2 nuclei compiled by Dors et al (2015) and 14 observed by Dopita et al (2015). All emission line intensities are reddening corrected.…”

Section: Agn Samplementioning

confidence: 99%

New quantitative nitrogen abundance estimations in a sample of Seyfert 2 active galactic nuclei

Dors

Arellano-Córdova

Cardaci

et al. 2017

Monthly Notices of the Royal Astronomical Society: Letters

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We obtained new quantitative determinations of the nitrogen abundance and a consistent relation between nitrogen and oxygen abundances for a sample of Seyfert 2 galaxies located at redshift z < 0.1. We carried out this analysis using the Cloudy code to build detailed photoionization models. We were able to reproduce observed optical narrow emission line intensities for 44 sources compiled from the literature. Our results show that Seyfert 2 nuclei have nitrogen abundances ranging from ∼ 0.3 to ∼ 7.5 times the solar value. We derived the relation log(N/H) = 1.05(±0.09) × [log(O/H)] − 0.35(±0.33). Results for N/O vs. O/H abundance ratios derived for Seyfert 2 galaxies are in consonance with those recently derived for a sample of extragalactic disk H ii regions with high metallicity.

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“…The sample consists of 47 Sy2 nuclei compiled by Dors et al (2015) and 14 observed by Dopita et al (2015). All emission line intensities are reddening corrected.…”

Section: Agn Samplementioning

confidence: 99%

New quantitative nitrogen abundance estimations in a sample of Seyfert 2 active galactic nuclei

Dors

Arellano-Córdova

Cardaci

et al. 2017

Monthly Notices of the Royal Astronomical Society: Letters

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“…Three-colour [O III]-Hα-[N II] images and nuclear spectral properties for the first 64 S7 sources are compiled in [9]. This information can be used as a reference for source selection from S7 galaxies.…”

Section: Overview Of S7 Resultsmentioning

confidence: 99%

“…S7 is a targeted survey based on optical integral field spectroscopy, providing data for the central regions of ∼ 140 nearby Seyfert galaxies on ∼ 100 pc scales resolution [7,8,9,10]. S7 is designed to probe the AGN NLR by means of emission-line diagnostics and kinematics.…”

Section: Introductionmentioning

confidence: 99%

The WiFeS S7 AGN Survey: Current Status and Recent Results on NGC 6300

Scharwächter¹,

Dopita²,

Shastri³

et al. 2016

Astrophysics and Space Science Proceedings

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The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) is a targeted survey probing the narrow-line regions (NLRs) of a representative sample of ∼ 140 nearby (z < 0.02) Seyfert galaxies by means of optical integral field spectroscopy. The survey is based on a homogeneous data set observed using the Wide Field Spectrograph WiFeS. The data provide a 25 × 38 arcsec 2 field-of-view around the galaxy centre at typically ∼ 1.5 arcsec spatial resolution and cover a wavelength range between ∼ 3400 − 7100Å at spectral resolutions of ∼ 100 km s −1 and ∼ 50 km s −1 in the blue and red parts, respectively. The survey is primarily designed to study gas excitation and star formation around AGN, with a special focus on the shape of the AGN ionising continuum, the interaction between radio jets and the NLR gas, and the nature of nuclear LINER emission. We provide an overview of the current status of S7-based results and present new results for NGC 6300.

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“…Perpendicular to this disc is an ionization cone with an opening angle of 110 deg that is excited by the central AGN, highlighted in Fig. 17 and described in Dopita et al (2015). The gas within this cone is highly ionized and extends to 15 kpc.…”

Section: A P P L I C At I O N To S a N D S A M Imentioning

confidence: 99%

Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7

Hampton

Medling

Groves

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Integral field spectroscopy (IFS) surveys are changing how we study galaxies and are creating vastly more spectroscopic data available than before. The large number of resulting spectra makes visual inspection of emission line fits an infeasible option. Here, we present a demonstration of an artificial neural network (ANN) that determines the number of Gaussian components needed to describe the complex emission line velocity structures observed in galaxies after being fit with LZIFU. We apply our ANN to IFS data for the S7 survey, conducted using the Wide Field Spectrograph on the ANU 2.3 m Telescope, and the SAMI Galaxy Survey, conducted using the SAMI instrument on the 4 m Anglo-Australian Telescope. We use the spectral fitting code LZIFU (Ho et al. 2016a) to fit the emission line spectra of individual spaxels from S7 and SAMI data cubes with 1-, 2-and 3-Gaussian components. We demonstrate that using an ANN is comparable to astronomers performing the same visual inspection task of determining the best number of Gaussian components to describe the physical processes in galaxies. The advantage of our ANN is that it is capable of processing the spectra for thousands of galaxies in minutes, as compared to the years this task would take individual astronomers to complete by visual inspection.

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Probing the Physics of Narrow Line Regions in Active Galaxies. Ii. The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)

Cited by 72 publications

References 114 publications

New quantitative nitrogen abundance estimations in a sample of Seyfert 2 active galactic nuclei

New quantitative nitrogen abundance estimations in a sample of Seyfert 2 active galactic nuclei

The WiFeS S7 AGN Survey: Current Status and Recent Results on NGC 6300

Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7

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