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55 papers · 1 filter
The location and kinematics of the coronal-line emitting regions in AGN
J. R. Mullaney, M. J. Ward, C. Done +2
We use the photoionisation code Cloudy to determine both the location and the kinematics of the optical forbidden, high ionisation line (hereafter, FHIL) emitting gas in the narrow…
Magnetic fields and the location of the PDR
Gary J. Ferland
I review recent studies of the emission-line regions in Orion and M17. Both have similar geometries, a bubble of hot shocked gas surrounding the central star cluster, with H^+, H^0…
Uncertainties in Theoretical HeI Emissivities: HII Regions, Primordial Abundance, and Cosmological Recombination
R. L. Porter, G. J. Ferland, K. B. MacAdam +1
A number of recent works in astronomy and cosmology have relied upon theoretical He I emissivities, but we know of no effort to quantify the uncertainties in the atomic data. We an…
Collisional heating as the origin of filament emission in galaxy clusters
G. J. Ferland, A. C. Fabian, N. A. Hatch +4
[Abridged] Photoionization, whether by starlight or other sources, has difficulty in accounting for the observed spectra of the optical filaments that often surround central galaxi…
The three dimensional dynamic structure of the inner Orion Nebula
C. R. O'Dell, W. J. Henney, N. P. Abel +2
The three dimensional structure of the brightest part of the Orion Nebula is assessed in the light of published and new data. We find that the widely accepted model of a concave bl…
Disk Evolution and Bar Triggering Driven by Interactions with Dark Matter Substructure
Emilio Romano-Diaz, Isaac Shlosman, Clayton Heller +1
We study formation and evolution of bar-disk systems in fully self-consistent cosmological simulations of galaxy formation in the LCDM WMAP3 Universe. In a representative model we…