A5065924919- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Molecular Spectroscopy and Structure
- Scientific Research and Discoveries
- Fluid Dynamics and Mixing
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Petroleum Processing and Analysis
- Enhanced Oil Recovery Techniques
- Sarcoma Diagnosis and Treatment
- Radio Astronomy Observations and Technology
- Hemodynamic Monitoring and Therapy
- Healthcare Technology and Patient Monitoring
- Spectroscopy and Laser Applications
- Asphalt Pavement Performance Evaluation
- Fluid Dynamics and Turbulent Flows
- Graphite, nuclear technology, radiation studies
- Ionosphere and magnetosphere dynamics
- Particle Dynamics in Fluid Flows
Australian National University
2022-2025
Canadian Institute for Theoretical Astrophysics
2020-2024
University of Toronto
2020-2024
University of Alberta
2024
Vrije Universiteit Brussel
2023-2024
Institut d'Astrophysique Spatiale
2019-2021
Centre National de la Recherche Scientifique
2016-2019
CEA Paris-Saclay
2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2019
Université Paris-Sud
2019
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....
Context. Extracting the multiphase structure of neutral interstellar medium is key to understanding star formation in galaxies. The radiative condensation diffuse warm producing a thermally unstable lukewarm and dense cold closely related initial step leading atomic-to-molecular (HI-to-H 2 ) transition molecular clouds. Up now, mapping these phases out 21 cm emission hyper-spectral cubes has remained elusive mostly due velocity blending individual structures present on given line sight. As...
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...
Abstract The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early-stage precursors of star formation. Uncovering its origin is key to understanding dynamical mechanisms that control evolution contents. In this study, we explore 3D geometry and dynamics NCPL using high-resolution dust extinction data H i data, respectively. We find material toward Polaris Ursa Major distributed along plane similarly oriented Radcliffe wave. Spider projected in between appears...
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...
CO isotopologue transitions are routinely observed in molecular clouds to probe the column density of gas, elemental ratios carbon and oxygen, trace kinematics environment. We aim at estimating abundances, excitation temperatures, velocity field dispersions three main isotopologues towards a subset Orion B cloud. use Cramer Rao Bound (CRB) technique analyze estimate precision physical parameters framework local-thermodynamic-equilibrium radiative transfer with an additive white Gaussian...
Abstract The transition from the diffuse warm neutral medium (WNM) to dense cold (CNM) is what set initial conditions formation of molecular clouds. properties turbulent cascade in WNM, essential describe this radiative condensation process, have remained elusive part due difficulty mapping out structure and kinematics each H i thermal phase. Here we present an analysis a 21 cm hyper-spectral data cube GHIGLS survey where contribution WNM extracted using ROHSA , Gaussian decomposition tool...
The Square Kilometre Array Observatory (SKAO) will explore the radio sky to new depths in order conduct transformational science. SKAO data products made available astronomers be correspondingly large and complex, requiring application of advanced analysis techniques extract key science findings. To this end, is conducting a series Science Data Challenges, each designed familiarise scientific community with drive development techniques. We present results from Challenge 2 (SDC2), which...
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...
The physical properties of galactic halo gas have a profound impact on the life cycle galaxies. As travels through halo, it undergoes dynamical interactions, influencing its star formation and chemical evolution disk. In Milky-Way considerable effort has been made to understand spatial distribution neutral gas, which are mostly in form large complexes. However, internal variations their remains unclear. this study, we investigate thermal state HVCs. High-resolution observations (1.'1) 21 cm...
We present the identification of previously unnoticed physical association between Corona Australis molecular cloud (CrA), traced by interstellar dust emission, and two shell-like structures observed with line emission atomic hydrogen (HI) at 21 cm. Although existence shells had already been reported in literature, link HI CrA never highlighted until now. used both Planck Herschel data to trace Galactic All Sky Survey (GASS) HI. The is assessed based on spectroscopic observations gas...
We revisit the reliability of metallicity estimates high velocity clouds with help hydrodynamical simulations. quantify effect accretion and viewing angle on derived from absorption lines. Model parameters are chosen to provide strong lower limits cloud contamination by ambient gas. Consistent previous results, a traveling through stratified halo is contaminated material point that <10% its mass in neutral hydrogen consists original material. Contamination progresses nearly linearly time, it...
The low-brightness dust emission at high Galactic latitudes is of interest with respect to studying the interplay among physical processes involved in shaping structure interstellar medium (ISM), as well statistical characterizations a foreground cosmic microwave background (CMB). Progress this avenue research has been hampered by difficulty related separating from infrared (CIB). We demonstrate that and CIB may be effectively separated based on their different sky we use separation...
Abstract The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early stages of star formation, in particular condensation neutral interstellar medium (ISM). Understanding physical properties that control evolution its contents is key to uncovering origin NCPL. Archival data from NCPL region GHIGLS 21 cm line survey (9.′4) are used map multiphase content with ROHSA , Gaussian decomposition tool includes spatial regularization. Column density and mass fraction maps...
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 Angular dispersion functions are typically used to estimate the fluctuations in polarization angle around mean magnetic field orientation dense regions, such as molecular clouds. The technique provides accurate turbulent-to-regular ratios, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo stretchy="false">〈</mml:mo> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>t</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> <mml:msup> stretchy="false">〉</mml:mo> <mml:mrow>...
Abstract Understanding how the Galactic magnetic field threads multiphase interstellar medium (ISM) remains a considerable challenge, as different tracers probe dissimilar phases and components. We search for evidence of common shared between ionized neutral ISM by comparing 1.4 GHz radio continuum polarization H i line emission from Arecibo L -Band Feed Array Continuum Transit Survey (GALFACTS) (GALFA-H ) survey, respectively. compute gradient associations with diffuse/translucent...
Understanding the initial properties of star-forming material and how they affect star formation process is key. From an observational point view, feedback from young high-mass stars on future still poorly constrained. In framework IRAM 30m ORION-B large program, we obtained observations translucent moderately dense gas, which used to analyze kinematics over a field 5 deg^2 around filamentary structures. We ROHSA algorithm decompose de-noise C18O(1-0) 13CO(1-0) signals by taking spatial...
Respiratory Oscillometry is a promising technique to provide information medical practitioners on the respiratory system of patient in non-invasive fashion. It focuses identifying impedance between air pressure and flow signals. However, for conscious patients, breathing acts as disturbance parameter estimation process. Therefore, it increases variance estimated parameters impedance. To solve this problem, paper proposes method separate contribution from controlled excitation measured The...
We have discovered a 300kpc-wide giant Lya nebula centered on the massive galaxy group RO-1001 at z=2.91 in COSMOS field. Keck Cosmic Web Imager observations reveal three cold gas filaments converging into center of potential well its ~4x10^13Msun dark matter halo, hosting 1200Msun/yr star formation as probed by ALMA and NOEMA observations. The morphological kinematics properties prevalence blueshifted components spectra are consistent with scenario accretion. upper limits AGN activity...