A5083043836- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Physics of Superconductivity and Magnetism
- Organic and Molecular Conductors Research
- High-pressure geophysics and materials
- Geotechnical and Geomechanical Engineering
- Astronomical Observations and Instrumentation
- Quantum and electron transport phenomena
Radboud University Nijmegen
2019-2024
University of Groningen
1991-2019
Abstract Magnetic fields permeate the entire Galaxy and are essential to, for example, regulation of several stages star formation process cosmic-ray transportation. Unraveling their properties, such as intensity topology, is an observational challenge that requires combining different complementary techniques. The polarization starlight due to absorption by field-aligned nonspherical dust grains provides a unique source information about interstellar magnetic field in optical band. This...
Abstract Optical starlight can be partially polarized while propagating through the dusty, magnetized interstellar medium (ISM). The polarization efficiency describes intensity fraction per reddening unit, P V / E ( B − ), related to dust grains and magnetic field properties. maximum value observed, [ )] max , is thus achieved under optimal polarizing conditions of ISM. Therefore, analysis observations across Galaxy contributes study topology, small-scale fluctuations, grain-alignment...
Abstract The Galactic global magnetic field is thought to play a vital role in shaping structures such as spiral arms and giant molecular clouds. However, our knowledge of the plane at different distances limited, measurements used map are integrated effect along line sight. In this study, we present first ever tomographic imaging arm. Using optical stellar polarimetry over <?CDATA $17^{\prime} \times 10^{\prime} $?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">...
Abstract Starlight polarimetry, when combined with accurate distance measurements, allows for exploration of the three-dimensional structure local magnetic fields in great detail. We present optical polarimetric observations stars and close to Southern Coalsack, taken from Interstellar Polarization Survey. Located five view approximately 0.°3 × size, these data represent highest density Coalsack date. Using data, distances extinctions based on Gaia we are able characterize field disentangle...
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 Galaxies are believed to experience star formation and black-hole-driven nuclear activity symbiotically. The symbiosis may be more extreme in the distant universe, as far-infrared photometry with Herschel Space Observatory has found many cases of ultraluminous cool dust emission z > 1 radio galaxies quasars, which could have its origin central black hole activity, or starbursts. We here present strong evidence for an circumnuclear starburst = 1.439 quasar 3C298. Our unparalleled...
Far-infrared photometry with the Herschel Space Observatory has found many examples of ultra-luminous dust emission at around 40 K in host galaxies high-redshift, radio-loud 3C Active Galactic Nuclei (AGN). The heating could have its origin central black hole activity or extreme circumnuclear starbursts, both. We used Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 3 to study morphology on kiloparsec scale a sample these AGN, and present results for three well-known distant...
Starlight polarimetry, when combined with accurate distance measurements, allows for exploration of the three-dimensional structure local magnetic fields in great detail. We present optical polarimetric observations stars and close to Southern Coalsack, taken from Interstellar Polarization Survey (IPS). Located five view approximately $0.3^{o}$ by size, these data represent highest density Coalsack date. Using data, distances extinctions based on Gaia we are able characterize field...
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 regular ratios, $\langle B_t^2\rangle^{1/2}/B_{pos}$, which often underestimated by classic Davis-Chandrasekhar-Fermi method. We assess technique's suitability characterize and plane-of-sky low-density structures of nearby interstellar medium (ISM), particularly when...
Optical starlight can be partially polarized while propagating through the dusty, magnetized interstellar medium. The polarization efficiency describes intensity fraction per reddening unit, P$_V$/E($B-V$), related to dust grains and magnetic field properties. maximum value observed, [P$_V$/E$(B-V)]_{max}$, is thus achieved under optimal polarizing conditions of Therefore, analysis observations across Galaxy contributes study topology, small-scale fluctuations, grain-alignment efficiency,...
The Galactic global magnetic field is thought to play a vital role in shaping structures such as spiral arms and giant molecular clouds. However, our knowledge of the plane at different distances limited, measurements used map are integrated effect along line sight. In this study, we present first-ever tomographic imaging arm. Using optical stellar polarimetry over $17' \times 10'$ view, probe Sagittarius Combining these data with from $Gaia$ mission, can isolate contributions five...
Magnetic fields permeate the entire Galaxy and are essential to, for example, regulation of several stages star formation process cosmic ray transportation. Unraveling its properties, such as intensity topology, is an observational challenge that requires combining different complementary techniques. The polarization starlight due to absorption by field-aligned non-spherical dust grains provides a unique source information about interstellar magnetic field in optical band. This work...