188 citations · 412 across the 11 of their papers we have counts for
11 papers
A Decade of NASA Strategic Astrophysics Technology Investments: Technology Maturation, Infusion, and Other Benefits
Thai Pham, Opher Ganel, Azita Valinia +3
NASA Astrophysics Division funds development of cutting-edge technology to enable its missions to achieve ambitious and groundbreaking science goals. These technology development e…
RXTE Investigation into Extended Hard X-ray Emission from Elliptical Galaxies
Michael Loewenstein, Azita Valinia, Richard Mushotzky
We present results of the first RXTE investigation of hard X-ray emission from normal elliptical galaxies. Joint spectral analysis of RXTE PCA and ASCA GIS data for NGC 4472 and NG…
On the Origin of the Iron K Line in the Spectrum of the Galactic X-ray Background
Azita Valinia, Vincent Tatischeff, Keith Arnaud +2
We propose a mechanism for the origin of the Galactic ridge X-ray background that naturally explains the properties of the Fe K line, specifically the detection of the centroid lin…
Hard X-ray Observation of Abell 496
Azita Valinia, Keith Arnaud, Michael Loewenstein +2
We report the results of hard X-ray observations of Abell 496 (A496), a nearby relaxed cluster, using the Rossi X-ray Timing Explorer (RXTE). The 3-20 keV spectrum of this cluster…
Structure of the Circumnuclear Region of Seyfert 2 Galaxies Revealed by RXTE Hard X-ray Observations of NGC 4945
G. M. Madejski, P. T. Zycki, C. Done +4
We report the Rossi X-ray Timing Explorer observations of the heavily absorbed Seyfert 2 galaxy NGC 4945, which confirm the large column density of the absorber, corresponding to t…
Measurement Of the Galactic X-ray/Gamma-ray Background Radiation: Contribution of Discrete Sources
Azita Valinia, Robert L. Kinzer, Francis E. Marshall
The Galactic background radiation near the Scutum Arm was observed simultaneously with RXTE and OSSE in order to determine the spectral shape and the origin of the emission in the…
Nonthermal X-Rays from the Galactic Ridge: a Tracer of Low Energy Cosmic Rays ?
V. Tatischeff, R. Ramaty, A. Valinia
A distinct low energy cosmic-ray component has been proposed to explain the essentially constant Be/Fe ratio at low metallicities. Atomic collisions of such low energy ions produce…
Science with the Constellation-X Observatory
Azita Valinia, Nicholas White, Harvey Tananbaum +1
The Constellation X-ray Mission is a high throughput X-ray facility emphasizing observations at high spectral resolution (E/ΔE \sim 300-3000), and broad energy bandpass (0.25-40 ke…
RXTE Hard X-ray Observation of A754: Constraining the Hottest Temperature Component and the Intracluster Magnetic Field
A. Valinia, M. J. Henriksen, M. Loewenstein +3
Abell 754, a cluster undergoing merging, was observed in hard X-rays with the Rossi X-ray Timing Explorer (RXTE) in order to constrain its hottest temperature component and search…
RXTE Measurement of the Diffuse X-ray Emission From the Galactic Ridge: Implications for the Energetics of the Interstellar Medium
Azita Valinia, Francis E. Marshall
(Abridged) The diffuse X-ray emission from the thin disk surrounding the Galactic mid-plane (the so-called Galactic ridge) was measured with RXTE PCA in order to determine the spat…
Gravitational Instability in Collisionless Cosmological Pancakes
Azita Valinia, Paul R. Shapiro, Hugo Martel +1
The gravitational instability of cosmological pancakes composed of collisionless dark matter in an Einstein-de Sitter universe is investigated numerically to demonstrate that panca…