M. Polkas

ORCID: 0000-0002-8889-2167
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About
Contact & Profiles
Research Areas
  • Galaxies: Formation, Evolution, Phenomena
  • Gamma-ray bursts and supernovae
  • Astrophysics and Cosmic Phenomena
  • Radio Astronomy Observations and Technology
  • Astronomy and Astrophysical Research
  • Refrigeration and Air Conditioning Technologies
  • Astrophysics and Star Formation Studies
  • Radio Wave Propagation Studies
  • Pulsars and Gravitational Waves Research
  • Dark Matter and Cosmic Phenomena
  • Solar and Space Plasma Dynamics
  • Ionosphere and magnetosphere dynamics

National Observatory of Athens
2023

Yale University
2021

National and Kapodistrian University of Athens
2021

Observatoire astronomique de Strasbourg
2021

Université de Strasbourg
2021

Centre National de la Recherche Scientifique
2021

Stars can be ripped apart by tidal forces in the vicinity of a massive black hole (MBH), causing luminous flares known as disruption events (TDEs). These could contributing to mass growth intermediate-mass MBHs. New samples from transient surveys provide useful information on this unexplored channel. This work aims study demographics TDEs modeling coevolution MBHs and their galactic environments cosmological framework. We use semianalytic galaxy formation model L-Galaxies BH , which follows...

10.1051/0004-6361/202449470 article EN cc-by Astronomy and Astrophysics 2024-09-01

ABSTRACT Decade-long monitoring of blazars at optical and infrared (OIR) wavelengths with the Small Moderate Aperture Research Telescope System (SMARTS) in Chile γ-rays Fermi -Large Area (LAT) has enabled systematic study their multiwavelength long-term variability. In this work, we investigate, from a theoretical perspective, variability properties blazar emission by introducing an observationally motivated time-dependence to four main parameters one-zone leptonic model: injection...

10.1093/mnras/stab1618 article EN Monthly Notices of the Royal Astronomical Society 2021-06-06

We report the detection of outflowing molecular gas at center nearby radio galaxy NGC6328 ( z = 0.014), which has a gigahertz-peaked spectrum core and compact (2 pc) young double lobe tracing jet. Utilizing Atacama Large Millimeter/submillimeter Array (ALMA) CO(3 − 2) CO(2 1) observations, as well novel code developed to fit 3D distribution kinematics, study we find that bulk is situated within highly warped disk structure, most likely result past merger event. Our analysis further uncovers,...

10.1051/0004-6361/202346464 article EN Astronomy and Astrophysics 2023-10-03

Stars can be ripped apart by tidal forces in the vicinity of a massive black hole, causing luminous flares classified as disruption events (TDEs). These could contributing to mass growth intermediate-mass holes, whilst new samples from ongoing transient surveys provide useful information on this unexplored channel. This work aims study demographics TDEs modeling co-evolution holes and their galactic environments cosmological framework. We use semi-analytic galaxy formation model L-Galaxies,...

10.48550/arxiv.2312.13242 preprint EN public-domain arXiv (Cornell University) 2023-01-01

We report the detection of outflowing molecular gas at center nearby radio galaxy NGC6328 (z=0.014), which has a gigahertz-peaked spectrum core and compact (2 pc) young double lobe tracing jet. Utilizing Atacama Large Millimeter/submillimeter Array (ALMA) CO(2-1) CO(3-2) observations, as well novel code developed to fit 3D distribution kinematics, study we find that bulk is situated within highly warped disk structure, most likely result past merger event. Our analysis further uncovers,...

10.48550/arxiv.2310.02033 preprint EN cc-by-nc-sa arXiv (Cornell University) 2023-01-01

Blazars are characterized by flux variability that is frequency-dependent and manifests in a varietyof timescales. Decade-long monitoring of blazars at optical infrared (OIR) wavelengthswith the Small Moderate Aperture Research Telescope System (SMARTS) Chile ingamma-rays with Fermi Large Area (LAT) has enabled systematic study theirmulti-wavelength (MW) long-term variability. These studies pinpoint besides extreme short-term (minutes to hours), source can exhibit correlated uncorrelated...

10.22323/1.395.0680 article EN cc-by-nc-nd Proceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019) 2021-07-04
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