Publications (26)
Gemini Observations of Disks and Jets in Young Stellar Objects and in Active Galaxies
Peter McGregor, Michael Dopita, Ralph Sutherland +2
We present first results from the Near-infrared Integral Field Spectrograph (NIFS) located at Gemini North. For the active galaxies Cygnus A and Perseus A we observe rotationally-s…
Theoretical Diagnostics for Narrow Line Regions of Active Galactic Nuclei
Peixin Zhu, Lisa J. Kewley, Ralph Sutherland
Gas metallicity, ionization parameter, and gas pressure can affect the observed ratios of specific strong emission lines within galaxies. While the theoretical strong lines diagnos…
Theoretical Evolution of Optical Strong Lines across Cosmic Time
Lisa J. Kewley, Michael A. Dopita, Claus Leitherer +5
We use the chemical evolution predictions of cosmological hydrodynamic simulations with our latest theoretical stellar population synthesis, photoionization and shock models to pre…
Fossil imprint of a powerful flare at the Galactic Centre along the Magellanic Stream
Joss Bland-Hawthorn, Phil Maloney, Ralph Sutherland +1
The Fermi satellite discovery of the gamma-ray emitting bubbles extending 50 deg (10 kpc) from the Galactic Centre has revitalized earlier claims that our Galaxy has undergone an e…
Probing the Physics of Narrow Line Regions in Active Galaxies II: The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)
Michael A. Dopita, Prajval Shastri, Rebecca Davies +14
Here we describe the \emph{Siding Spring Southern Seyfert Spectroscopic Snapshot Survey} (S7) and present results on 64 galaxies drawn from the first data release. The S7 uses the…
Spatially-Resolved Temperature and Density Structures of Nearby HII regions
Yifei Jin, Ralph Sutherland, Lisa Kewley +1
Photoionization models frequently assume constant temperature or density within HII regions. We investigate this assumption by measuring the detailed temperature and density struct…
Probing the Physics of Narrow Line Regions in Active Galaxies IV: Full data release of The Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7)
Adam D. Thomas, Michael A. Dopita, Prajval Shastri +15
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 fi…
Ultrafaint Dwarfs - Star Formation and Chemical Evolution in the Smallest Galaxies
David Webster, Ralph Sutherland, Joss Bland-Hawthorn
In earlier work we showed that a dark matter halo with a virial mass of M can retain a large percentage of its baryons in the face of the pre-ionization phase and su…
A MUSE View of the Optical Torus within the Supernova Remnant 1E 0102.2-7219
Janette Suherli, Samar Safi-Harb, Ivo R. Seitenzahl +7
We present new MUSE Narrow Field Mode with Adaptive Optics observations of the optical torus surrounding a Central Compact Object (CCO) candidate within the oxygen-rich supernova r…
Unravelling the enigmatic ISM conditions in Minkowski's Object
Henry R. M. Zovaro, Robert Sharp, Nicole P. H. Nesvadba +7
Local examples of jet-induced star formation lend valuable insight into its significance in galaxy evolution and can provide important observational constraints for theoretical mod…
Ultrafaint Dwarf Galaxies - the lowest mass relics from before reionization
Joss Bland-Hawthorn, Ralph Sutherland, David Webster
New observations indicate that ultrafaint dwarf galaxies (UFD) -- the least luminous systems bound by dark matter halos (<10^5 Lsun) -- may have formed before reionization. The ext…
The large-scale ionization cones in the Galaxy
Joss Bland-Hawthorn, Phil Maloney, Ralph Sutherland +6
There is compelling evidence for a highly energetic Seyfert explosion (10^{56-57} erg) that occurred in the Galactic Centre a few million years ago. The clearest indications are th…
The Infrared Emission from the Narrow Line Region
Brent Groves, Michael Dopita, Ralph Sutherland
We present models for the mid- and far- infrared emission from the Narrow Line Region (NLR) of Active Galactic Nuclei (AGN). Using the MAPPINGS III code we explore the effect of ty…
Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: I. The role of ISM pressure & the Molecular Cloud Dissipation Timescale
Michael Dopita, Brent Groves, Joerg Fischera +6
In this paper, we combine the stellar spectral synthesis code STARBURST 99, the nebular modelling code MAPPINGS IIIq, a 1-D dynamical evolution model of \HII regions around massive…
Messenger Monte-Carlo MAPPINGS V (M^3) -- A self-consistent three-dimensional photoionization code
Yifei Jin, Lisa Kewley, Ralph Sutherland
The Messenger Interface Monte-Carlo Mappings V (M^3) is a photoionization code adopting the fully self-consistent Monte-Carlo radiative transfer technique, which presents a major a…
Probing the Physics of Narrow Line Regions in Active Galaxies III: Accretion and Cocoon Shocks in the LINER NGC1052
Michael A. Dopita, I-Ting Ho, Linda L. Dressell +16
We present Wide Field Spectrograph (WiFeS) integral field spectroscopy and HST FOS spectroscopy for the LINER galaxy NGC 1052. We infer the presence of a turbulent accretion flow f…
The Internal Nebular Attenuation Curve of Three-Dimensional Turbulent HII regions
Yifei Jin, Yong Shi, Ralph Sutherland +2
The internal dust attenuation of the Hii region reduces the observed emission-line fluxes. Turbulent density fields within each Hii region change the degree of the line-of-the-sigh…
Dissecting Galaxies: Spatial and Spectral Separation of Emission Excited by Star Formation and AGN Activity
Rebecca L. Davies, Brent Groves, Lisa J. Kewley +13
The optical spectra of Seyfert galaxies are often dominated by emission lines excited by both star formation and AGN activity. Standard calibrations (such as for the star formation…
Starburst or Seyfert? Using near-infrared spectroscopy to measure the activity in composite galaxies
Tanya L. Hill, Charlene A. Heisler, Ralph Sutherland +1
We present near-infrared spectra for a sample of galaxies with ambiguous optical emission line ratios. These galaxies fall between starbursts and Seyferts in the usual optical diag…
Dissecting Galaxies: Separating Star Formation, Shock Excitation and AGN Activity in the Central Region of NGC 613
Rebecca L. Davies, Brent Groves, Lisa J. Kewley +13
The most rapidly evolving regions of galaxies often display complex optical spectra with emission lines excited by massive stars, shocks and accretion onto supermassive black holes…
Probing the physics of narrow-line regions of Seyfert galaxies I: The case of NGC 5427
Michael A. Dopita, Julia Scharwaechter, Prajval Shastri +10
We have used the Wide Field Spectrograph (WiFeS) on the ANU 2.3m telescope at Siding Spring to observe the nearby, nearly face-on, Seyfert 2 galaxy, NGC 5427. We have obtained inte…
S7 : Probing the physics of Seyfert Galaxies through their ENLR & HII Regions
Michael A. Dopita, Prajval Shastri, Julia Scharwachter +13
Here we present the first results from the Siding Spring Southern Seyfert Spectroscopic Snapshot Survey (S7) which aims to investigate the physics of ~140 radio-detected southern a…
Dusty, Radiation Pressure Dominated Photoionization: The Solution to the Narrow Line Region Problem
Brent Groves, Michael Dopita, Ralph Sutherland
Seyfert narrow line regions (NLR) have emission line ratios which are remarkably uniform, displaying only ~0.5 dex variation between different galaxies. Existing models have been u…
Shocked Gas in IRAS F17207-0014: ISM Collisions and Outflows
Anne M. Medling, Vivian U, Jeffrey A. Rich +6
We combine optical and near-infrared AO-assisted integral field observations of the merging ULIRG IRAS F17207-0014 from the Wide-Field Spectrograph (WiFeS) and Keck/OSIRIS. The opt…
Intertwined birth and death: a Herbig-Haro outflow resolves the distance to Vela Junior
Janette Suherli, Ivo R. Seitenzahl, Samar Safi-Harb +8
The distance to the Vela Junior supernova remnant (RX J0852.0-4622 or G266.2-1.2) has long remained uncertain, limiting our understanding of its physical properties. Using VLT/MUSE…
The Role of Radiation Pressure in the Narrow Line Regions of Seyfert Host Galaxies
Rebecca L. Davies, Michael A. Dopita, Lisa J. Kewley +13
We investigate the relative significance of radiation pressure and gas pressure in the extended narrow line regions (ENLRs) of four Seyfert galaxies from the integral field Siding…