A5085953495- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Computational Physics and Python Applications
- Planetary Science and Exploration
- Scientific Computing and Data Management
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Astro and Planetary Science
- Nuclear Materials and Properties
- Topological and Geometric Data Analysis
- Fusion materials and technologies
- Mechanics and Biomechanics Studies
- Adaptive optics and wavefront sensing
- Ionosphere and magnetosphere dynamics
- Scientific Research and Discoveries
- Data Visualization and Analytics
- Digital Image Processing Techniques
- Earthquake Detection and Analysis
- Laser-Plasma Interactions and Diagnostics
- Cosmology and Gravitation Theories
University of Southampton
2016-2024
Culham Science Centre
2014-2015
Culham Centre for Fusion Energy
2014
Topological data analysis (TDA) is a field of focused on understanding the shape and structure complex data.By computing topological descriptors data, such as connected components, loops, voids, we are better able to find hidden relationships among noisy high-dimensionality (Carlsson, 2009;Edelsbrunner & Harer, 2010).However, raw TDA metrics cannot be readily visualized.To address this gap, Singh et al. ( 2007) developed Mapper algorithm facilitate graphical exploration structures.The work...
Various unification schemes interpret the complex phenomenology of quasars and luminous active galactic nuclei (AGN) in terms a simple picture involving central black hole, an accretion disc associated outflow. Here, we continue our tests this paradigm by comparing quasar spectra to synthetic biconical wind models, produced with state-of-the-art Monte Carlo radiative transfer code. Previously, have shown that could produce resembling those observed broad absorption line (BAL) quasars, but...
The origin, geometry and kinematics of the broad line region (BLR) gas in quasars active galactic nuclei (AGN) are uncertain. We demonstrate that clumpy biconical disc winds illuminated by an AGN continuum can produce BLR-like spectra. first use a simple toy model to illustrate make quite good BLR candidates, because they self-shielded flows cover large portion ionizing flux-density ($\phi_H$-$n_H$) plane. then conduct Monte Carlo radiative transfer photoionization calculations, which fully...
X-ray signatures of outflowing gas have been detected in several accreting black-hole binaries, always the soft state. A key question raised by these observations is whether winds might also exist hard Here, we carry out first full-frequency radiation hydrodynamic simulations luminous ($\rm{L = 0.5 \, L_{\mathrm{Edd}}}$) binary systems both and state, with realistic spectral energy distributions (SEDs). Our are designed to describe transients near peak their outburst, just before after...
A significant number of tidal disruption events (TDEs) radiate primarily at optical and ultraviolet (UV) wavelengths, with only weak soft X-ray components. One model for this excess proposes that thermal emission from a compact accretion disc is reprocessed to longer wavelengths by an optically thick envelope. Here, we explore reprocessing scenario in the context wind. Using state-of-the-art Monte Carlo radiative transfer ionization software, produce synthetic UV spectra wind disc-hosting...
The broad emission lines (BELs) in active galactic nuclei (AGNs) respond to ionizing continuum variations. time and velocity dependence of their response depends on the structure broad-line region: its geometry, kinematics ionization state. Here, we predict reverberation signatures BELs formed rotating accretion disc winds. We use a Monte Carlo radiative transfer code velocity-delay maps for representative high- (C iv) low-ionization (H α) both moderate-luminosity AGNs. Self-shielding,...
Reverberation mapping (RM) is a powerful approach for determining the nature of broad-line region (BLR) in active galactic nuclei. However, inferring physical BLR properties from an observed spectroscopic time series difficult inverse problem. Here, we present blind test two widely used RM methods: MEMEcho (developed by Horne) and CARAMEL Pancoast collaborators). The data are simulated that track H$\alpha$ emission line response to empirical continuum light curve. underlying model rotating,...
The Astropy Project (http://astropy.org) is, in its own words, "a community effort to develop a single core package for Astronomy Python and foster interoperability between astronomy packages." For five years this project has been managed, written, operated as grassroots, self-organized, almost entirely volunteer while the software is used by majority of astronomical community. Despite this, always remains day effectively unfunded. Further, contributors receive little or no formal...
Outflows are critical components of many astrophysical systems, including accreting compact binaries and active galactic nuclei (AGN). These outflows can significantly affect a system's evolution alter its observational appearance by reprocessing the radiation produced central engine. Sirocco (Simulating Ionization Radiation in Created Compact Objects - or "the code formerly known as Python") is Sobolev-based Monte Carlo ionization radiative transfer code. It designed to simulate spectra any...
ABSTRACT Outflows are critical components of many astrophysical systems, including accreting compact binaries and active galactic nuclei (AGN). These outflows can significantly affect a system’s evolution alter its observational appearance by reprocessing the radiation produced central engine. sirocco (Simulating Ionization Radiation in Created Compact Objects – or ‘the code formerly known as python’) is Sobolev-based Monte Carlo ionization radiative transfer code. It designed to simulate...
The SPectrogram Analysis and Cataloguing Environment (SPACE) tool is an interactive python designed to label radio emission features of interest in a time-frequency map (called “dynamic spectrum”). program uses Matplotlib’s Polygon Selector widget allow user select edit undefined number vertices on top the dynamic spectrum before closing shape (polygon). Multiple polygons may be drawn any spectrum, feature name along with coordinates for each polygon vertex are saved into “.json” file as per...