37 citations · 237 across the 10 of their papers we have counts for
10 papers
Scattering polarization of the -states of ions and solar magnetic field: Effects of isotropic collisions
M. Derouich, H. Basurah, B. Badruddin
Analysis of solar magnetic fields using observations as well as theoretical interpretations of the scattering polarization is commonly designated as a high priority area of the sol…
IFU spectroscopy of southern PNe: III
A. Ali, M. A. Dopita, H. M. Basurah +3
In this paper we describe integral field spectroscopic observations of four southern Galactic Planetary Nebulae (PNe), M3-4, M3-6, Hen2-29 and Hen2-37 covering the spectral range,…
Problems for the WELS classification of planetary nebulae central stars: Self-consistent nebular modelling of four candidates
Hassan M. Basurah, Alaa Ali, Michael A. Dopita +3
We present integral field unit (IFU) spectroscopy and self-consistent photoionisation modelling for a sample of four southern Galactic planetary nebulae (PNe) with supposed weak em…
The physics and kinematics of the evolved, interacting planetary nebula PN G342.0-01.7
Alaa Ali, Morsi A. Amer, M. A. Dopita +2
Here we aim to study the physical and kinematical characteristics of the unstudied old planetary nebula (PN) PN G342.0-01.7, which shows evidence of interaction with its surroundin…
Galaxy emission line classification using 3D line ratio diagrams
Frédéric P. A. Vogt, Michael A. Dopita, Lisa J. Kewley +5
Two-dimensional (2D) line ratio diagnostic diagrams have become a key tool in understanding the excitation mechanisms of galaxies. The curves used to separate the different regions…
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…
Metal-poor dwarf galaxies in the SIGRID galaxy sample. I. HII region observations and chemical abundances
David C. Nicholls, Michael A. Dopita, Ralph S. Sutherland +3
In this paper we present the results of observations of seventeen HII regions in thirteen galaxies from the SIGRID sample of isolated gas rich irregular dwarf galaxies. The spectra…
Spaxel Analysis: Probing the Physics of Star Formation in Ultraluminous Infrared Galaxies
Michael A. Dopita, Jeffrey Rich, Frédéric P. A. Vogt +5
This paper presents a detailed spectral pixel (spaxel) analysis of the ten Luminous Infrared Galaxies (LIRGs) previously observed with the Wide Field Spectrograph (WiFeS), an integ…
Nebular metallicities in two isolated Local Void dwarf galaxies
David C. Nicholls, Helmut Jerjen, Michael A. Dopita +1
Isolated dwarf galaxies, especially those situated in voids, may provide insight into primordial conditions in the Universe and the physical processes that govern star formation in…
New additional material of meteor showers during 9th -19th centuries in the Islamic history
Hassan M. Basurah
This article presents twelve records of meteor showers in Arabic chronicles covering period from the 9th to the 19th century. The observations were in Egypt, Morocco, Syria and Yem…