A5069445240- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Satellite Image Processing and Photogrammetry
- Plant Water Relations and Carbon Dynamics
- Nonlinear Waves and Solitons
- Superconducting and THz Device Technology
- Structural Analysis of Composite Materials
- Photoacoustic and Ultrasonic Imaging
- Cosmology and Gravitation Theories
- Aeolian processes and effects
- Photodynamic Therapy Research Studies
- Historical Astronomy and Related Studies
- Material Science and Thermodynamics
- Relativity and Gravitational Theory
- Optical measurement and interference techniques
Goddard Space Flight Center
2020-2022
Universities Space Research Association
2020-2021
University of North Carolina at Chapel Hill
2016-2021
Augusta University
2017-2020
Trinity University
2012
Abstract Using a series of 3D relativistic hydrodynamical simulations active galactic nuclei (AGN) we investigate how AGN power, clumpy interstellar medium (ISM) structure, and jet angle with respect to the disk affect morphology content resulting outflow. For low-power across three orders magnitude luminosities (10 41 –10 43 erg s −1 ) our did not show significant changes either or total mass Changing galaxy small in outflow factor 2–3. Jets perpendicular created hot single-phase outflows,...
Abstract NGC 4945 contains a well-known heavily obscured active galactic nucleus (AGN) at its core, with prior reports of strong nuclear and off-nuclear neutral Fe K α emission due to the AGN activity. We report discovery very extended XMM-Newton EPIC pn in ∼5 kpc by ∼10 region that is misaligned plane inclined optical disk ∼60° projection. After careful consideration crowded center galaxy numerous unresolved hard X-ray sources present, we estimate ∼15% on kiloparsec-sized scales. The...
Our three-dimensional hydro-dynamical simulations of starbursts examine the formation superbubbles over a range driving luminosities and mass loadings that determine superbubble growth wind velocity. From this we relationship between velocity galactic power starburst. We find threshold for wind, above which speed is not affected by grid resolution or temperature floor our radiative cooling. investigate effect two different floors in cooling prescription have on kinematics content. to $10$ K...
Abstract Galactic winds are associated with intense star formation and active galactic nuclei. Depending on their mechanism velocity, they may remove a significant fraction of gas from host galaxies, thus suppressing formation, enriching the intergalactic medium, shaping circumgalactic gas. However, long-term evolution these remains mostly unknown. We report detection wind NGC 3079 to at least 60 kpc galaxy. detect in far-ultraviolet (FUV) line emission (as inferred broad FUV filter Galaxy...
Abstract Using synthetic absorption lines generated from 3D hydrodynamical simulations, we explore how the velocity of a starburst-driven galactic wind correlates with star formation rate (SFR) and SFR density. We find strong correlations for neutral low ionized gas, but no correlation highly gas. The gas only hold SFRs below critical limit set by mass loading starburst, above which point scaling relations flatten abruptly. Below this depend on temperature regime being probed line, not...
This white paper discusses the breadth of science related to active galactic nuclei (AGN) and associated phenomena be enabled by a mission with microcalorimeter energy resolution in soft X-ray band, large collecting area, wide-field imaging. Such mission, Line Emission Mapper (LEM), has been proposed NASA's 2023 Astrophysics Probe Explorer call. While pillars PI-led part focus on galaxy evolution, LEM All-Sky Survey (LASS) General Observer/Investigator opportunities will enable vital...
Published orbits of spectroscopic binaries are investigated for spurious periods by a simple method. Attention is drawn to possible the type I/Pz = I/P + 1/2 in symmetric double-line binaries. Four new cases found 130 examined. David Dunlap Observatory, Richmond Hill, Ont.
We present the results from an analysis of deep Herschel far-infrared observations edge-on disk galaxy NGC 3079. The PSF-cleaned PACS images at 100 and 160 um display a 25 kpc x X-shape structure centered on nucleus that is similar in extent orientation to seen Halpha, X-rays, far-ultraviolet. One dusty filaments making up this detected SPIRE 250 map out ~25 nucleus. match between those other wavelengths suggests material has been lifted by same large-scale galactic wind produced structures...
A set of 66 3D hydrodynamical simulations explores how galactic stellar mass affects three-phase, starburst-driven outflows. Simulated velocities are compared to two basic analytic models: with and without a gravitational potential. For <1010M⊙, simulated match those both analytical models unaffected by the potential; above they reduce significantly as expected from model gravity. Gravity also total outflow each three phases differently. Outflow masses in hot, warm, cold scale −0.25, −0.97,...
NGC 4945 contains a well-known heavily obscured active galactic nucleus (AGN) at its core, with prior reports of strong nuclear and off-nuclear neutral Fe K$\alpha$ emission due to the AGN activity. We report discovery very extended XMM-Newton EPIC pn in $\sim5$ kpc by $\sim10$ region that is misaligned plane inclined optical galaxy disk $\sim60$ degrees projection. After careful consideration crowded center numerous unresolved hard X-ray sources present, we estimate $\sim15$% on kpc-sized...
Some of the problems involved in detection plate motions by astronomical methods are discussed with particular reference to a Herstmonceux–Calgary cooperative program using photographic zenith tubes. Analysis observations obtained 1969 and 1970 shows that several decades continued observation may suffice present techniques demonstrate measure relative motion North American – Eurasian plates.