A5049860603- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Ionosphere and magnetosphere dynamics
- Spectroscopy and Laser Applications
- Real-time simulation and control systems
- Atmospheric Ozone and Climate
- Advanced Data Processing Techniques
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Adaptive optics and wavefront sensing
Australian National University
2022-2025
University of Alberta
2024
Canadian Institute for Theoretical Astrophysics
2024
University of Toronto
2024
Abstract The structure and dynamics of the star-forming disk Small Magellanic Cloud (SMC) have long confounded us. SMC is widely used as a prototype for galactic physics at low metallicity, yet we fundamentally lack an understanding its interstellar medium (ISM). In this work, present new model by comparing kinematics young, massive stars with ISM traced high-resolution observations neutral atomic hydrogen (H i ) from Galactic Australian Square Kilometre Array Pathfinder survey....
We present the most sensitive and detailed view of neutral hydrogen (HI) emission associated with Small Magellanic Cloud (SMC), through combination data from Australian Square Kilometre Array Pathfinder (ASKAP) Parkes (Murriyang), as part Galactic (GASKAP) pilot survey. These GASKAP-HI observations, for first time, reveal HI in SMC on similar physical scales other important tracers interstellar medium, such molecular gas dust. The resultant image cube possesses an rms noise level 1.1 K (1.6...
We use the Milky Way neutral hydrogen (HI) absorption and emission spectra from Galactic Australian Square Kilometre Array Pathfinder (GASKAP) Phase II Pilot survey along with toy models to investigate effects of stacking multicomponent on measurements peak optical depth spin temperature. Shifting by in emission, 'primary' components shifted 0 km s$^{-1}$ are correctly averaged. Additional individual sightlines averaged non-centred velocities, producing a broader shallower 'secondary'...
Turbulence plays a crucial role in shaping the structure of interstellar medium. The ratio three-dimensional density contrast ($\sigma_{\rho/\rho_0}$) to turbulent sonic Mach number ($\mathcal{M}$) an isothermal, compressible gas describes solenoidal compressive modes acceleration field gas, and is parameterised by turbulence driving parameter: $b=\sigma_{\rho/\rho_0}/\mathcal{M}$. parameter ranges from $b=1/3$ (purely solenoidal) $b=1$ compressive), with $b=0.38$ characterising natural...
ABSTRACT We present the largest Galactic neutral hydrogen H i absorption survey to date, utilizing Australian SKA Pathfinder Telescope at an unprecedented spatial resolution of 30 arcsec. This survey, GASKAP-H i, unbiasedly targets 2714 continuum background sources over 250 square degrees in direction Magellanic Clouds, a significant increase compared total 373 observed by previous surveys across entire Milky Way. aim investigate physical properties cold (CNM) and warm (WNM) atomic gas Way...
We present the first unbiased survey of neutral hydrogen (HI) absorption in Small Magellanic Cloud (SMC). The utilises pilot HI observations with Australian Square Kilometre Array Pathfinder (ASKAP) telescope as part Galactic ASKAP (GASKAP-HI) project whose dataset has been processed GASKAP-HI pipeline, also described here. This provides spectra towards 229 continuum sources, a 275% increase number sources previously published SMC region, well an improvement quality over previous surveys...
Abstract We develop a new method for spatially mapping lower limit on the mass fraction of cold neutral medium by analyzing amplitude structure <?CDATA ${\hat{T}}_{b}({k}_{v})$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mover accent="true"> <mml:mi>T</mml:mi> </mml:mrow> <mml:mo>ˆ</mml:mo> </mml:mover> <mml:mi>b</mml:mi> </mml:msub> <mml:mo stretchy="false">(</mml:mo> <mml:mi>k</mml:mi> <mml:mi>v</mml:mi>...
ABSTRACT High-spatial-resolution H i observations have led to the realization that nearby (within few hundreds of parsecs) Galactic atomic filamentary structures are aligned with ambient magnetic field. Enabled by high-quality data from Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope for ASKAP survey, we investigate potential alignment $\gtrsim\!{10}\, {\rm pc}$-scale filaments in Small Magellanic Cloud (SMC). Using Rolling Hough Transform technique automatically...
We present the largest Galactic neutral hydrogen HI absorption survey to date, utilizing Australian SKA Pathfinder Telescope at an unprecedented spatial resolution of 30''. This survey, GASKAP-HI, unbiasedly targets 2,714 continuum background sources over 250 square degrees in direction Magellanic Clouds, a significant increase compared total 373 observed by previous surveys across entire Milky Way. aim investigate physical properties cold (CNM) and warm (WNM) atomic gas Way foreground,...
Modern radio telescopes generate large amounts of data, with the next generation Very Large Array (ngVLA) and Square Kilometre (SKA) expected to feed up 292 GB visibilities per second science data processor (SDP). However, continued exponential growth in power world's largest supercomputers suggests that for foreseeable future there will be sufficient capacity available provide astronomers' needs processing 'science ready' products from new telescopes, commercial platforms becoming an option...
Context . The Galactic ASKAP collaboration (GASKAP) is undertaking an HI emission survey of the 21cm line to map Magellanic system and plane with Australian Square Kilometre Array Pathfinder (ASKAP). One first areas observed in Pilot Phase I was Small Cloud (SMC). Previous surveys SMC have uncovered new structures periphery SMC, along relatively low column density lines sight. Aims In this work we aimed uncover phase distribution three distinct SMC. This will add constraints on existence...
Context. The Galactic ASKAP collaboration (GASKAP) is undertaking an HI emission survey of the 21cm line to map Magellanic system and plane with Australian Square Kilometre Array Pathfinder (ASKAP). One first areas observed in Pilot Phase I was Small Cloud (SMC). Previous surveys SMC have uncovered new structures periphery SMC, along relatively low column density lines sight. Aims. In this work we aimed uncover phase distribution three distinct SMC. This will add constraints on existence...
High-spatial-resolution HI observations have led to the realisation that nearby (within few hundreds of parsecs) Galactic atomic filamentary structures are aligned with ambient magnetic field. Enabled by high quality data from Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope for ASKAP (GASKAP-HI) survey, we investigate potential alignment $\gtrsim 10\,{\rm pc}$-scale filaments in Small Magellanic Cloud (SMC). Using Rolling Hough Transform (RHT) technique automatically...
The structure and dynamics of the star-forming disk Small Magellanic Cloud (SMC) have long confounded us. SMC is widely used as a prototype for galactic physics at low metallicity, yet we fundamentally lack an understanding its interstellar medium (ISM). In this work, present new model by comparing kinematics young, massive stars with ISM traced high-resolution observations neutral atomic hydrogen (HI) from Galactic Australian Square Kilometer Array Pathfinder survey (GASKAP-HI)....
We develop a new method for spatially mapping lower limit on the mass fraction of cold neutral medium by analyzing amplitude structure $\hat T_b(k_v)$, Fourier transform $T_b(v)$, spectrum brightness temperature HI 21cm line emission with respect to radial velocity $v$. This advances broader effort exploiting data alone (without absorption data, $\tau$) extract integrated properties multiphase gas and map each phase separately. Using toy models, we illustrate origin interference patterns...