A5009676764- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Pulsars and Gravitational Waves Research
- Relativity and Gravitational Theory
- Geophysics and Gravity Measurements
- Neutrino Physics Research
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Scientific Research and Discoveries
- Cold Atom Physics and Bose-Einstein Condensates
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- X-ray Diffraction in Crystallography
- Particle physics theoretical and experimental studies
- Crystallization and Solubility Studies
- Black Holes and Theoretical Physics
- Experimental and Theoretical Physics Studies
- Lipid Membrane Structure and Behavior
Cracow University of Technology
2016-2024
Institute of Physics
2016-2022
Institute of Nuclear Physics, Polish Academy of Sciences
2007-2015
Polish Academy of Sciences
2015
The Cosmic Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) ray ensembles (CRE): groups of minimum two CR with common primary interaction vertex or the same parent particle. CREDO program embraces testing known CRE scenarios, preparing observe unexpected physics, it also suitable for multi-messenger multi-mission applications. Perfectly matched capabilities, could be formed both within classical models...
An iterative method for reconstructing mass distribution in spiral galaxies using a thin disk approximation is developed. As an example, the applied to galaxy NGC 4736; its rotation curve does not allow one employ model with massive spherical halo. We find global this (without non-baryonic dark matter) that agrees perfectly high resolution of galaxy. This consistent $I$-band luminosity profile mean mass-to-light ratio $M/L_I=1.2$, and also amount hydrogen observed outermost regions predict...
Spiral galaxies are studied using a simple global disc model as means for approximate determination of mass profiles. Based on rotation curves and the amount gas (HI+He), we find surface densities consistent with measurements compare them B-band brightness As result obtain mass-to-light ratio We give some arguments why our approach is reliable sometimes better than those assuming ad hoc presence massive non-baryonic dark matter halo. Using this model, study NGC 7793, 1365, 6946 UGC 6446....
The Cosmic-Ray Extremely Distributed Observatory (CREDO) is a project dedicated to global studies of extremely extended cosmic-ray phenomena, the ensembles (CRE), beyond capabilities existing detectors and observatories. Up date, research has been focused on detecting single air showers, while search for cosmic-rays, which may overspread significant fraction Earth, scientific terra incognita. Instead developing commissioning completely new detector infrastructure, CREDO proposes approaching...
The aim of this work is to show, in the framework a simple finite-width disk model, that amount mass seen through gravitational microlensing measurements region 0 < R R° consistent with dynamical ascertained from Galaxy rotation after subtracting gas contribution. Since only detects compact objects, result suggests non-baryonic component may be negligible region.
Non-monotonic features of rotation curves, and also the related gravitational effects typical thin discs – like backward-reaction or amplification by negative surface density gradients which are characteristic imprints disc-like mass distributions, discussed in axisymmetric disc model. The influence data cut-off rotational velocity measurements on determination distribution flattened galaxies is studied. It has been found that baryonic matter spiral galaxy NGC 5475, obtained approximation,...
In this paper, we aim to estimate the vertical gradients in rotational velocity of Galaxy. This is carried out framework a global thin disc model approximation. The predicted gradient values coincide with observed fall-off rotation curve estimated based on statistical analysis trajectories test bodies gravitational field and an analytical way using quasi-circular orbit agreement results measurements remarkable view other more complicated, non-gravitational mechanisms used for explaining...
We address the problem of influence large-scale magnetic fields on galactic rotation for example spiral galaxy NGC 891. Based its curve and surface density HI we determine, in framework global disc model, matter. Then, based brightness, determine corresponding profile local mass-to-light ratio. also model vertical gradient azimuthal velocity quasi-circular-orbit approximation, compare it with measurements. discuss what factors may matter 891 how this can translate to changes In particular,...
We estimate the vertical gradient of rotational velocity for several spiral galaxies in framework a global thin-disc model, using approximation quasi-circular orbits. obtain gradients having broad range values, agreement with measurements, both low and high gradients. To model gradient, it suffices to know rotation curve only. illustrate, example galaxy NGC 4302 particularly gradients, that mass models galactic curves assume significant spheroidal component reduce predicted value, which may...
Stationary, axisymmetric, and asymptotically flat spacetimes of dust which trajectories are integral curves the time translation Killing vector investigated. The flow has no Newtonian limit. Asymptotic flatness implies existence singularities curvature scalar that distributions not isolated from regularity regions flow. closely related to presence additional stresses contribute negative active mass total (Komar) mass, is zero for spacetimes. Several families solutions were constructed.
The Cosmic Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) ray ensembles (CRE): groups of minimum two CR with common primary interaction vertex or the same parent particle. CREDO program embraces testing known CRE scenarios, preparing observe unexpected physics, it also suitable for multi-messenger multi-mission applications. Perfectly matched capabilities, could be formed both within classical models...
In this paper we model the vertical structure of mass distribution Milky Way galaxy in framework a finite-width global disk model. Assuming Galactic rotation curve only, test inside solar orbit predictions for two measurable and unrelated to each other processes: gravitational microlensing that allows fix width-scale by best fit measurements, gradient modelled quasi-circular orbits approximation. The former is sensitive gravitating compact objects latter all kinds matter. analysis points...
It is shown that strange quark matter (SQM) objects, stars, and planets, can very efficiently convert the mechanical energy into hadronic when they oscillate. This because mass density at edge of SQM $\rho_0{=}4.7{\times}10^{14}\frac{\mathrm{g}}{\mathrm{cm}^3}$, critical below which unstable with respect to decay photons, hadrons, leptons. We consider here radial oscillations objects could be induced in stellar or planetary systems where tidal interactions are ubiquitous. Oscillations...
The Cosmic Ray Extremely Distributed Observatory (CREDO) is a newly formed, global collaboration dedicated to observing and studying cosmic rays (CR) ray ensembles (CRE): groups of minimum two CR with common primary interaction vertex or the same parent particle. CREDO program embraces testing known CRE scenarios, preparing observe unexpected physics, it also suitable for multi-messenger multi-mission applications. Perfectly matched capabilities, could be formed both within classical models...
The magnetic fields that are present in the galaxy NGC 253 exceptionally strong. This means they can influence rotation of matter and hence mass-to-light ratio. In this context, we address issue presence a non-baryonic dark halo galaxy.
The Cosmic-Ray Extremely Distributed Observatory (CREDO) is an infrastructure for global analysis of extremely extended cosmic-ray phenomena, so-called super-preshowers, beyond the capabilities existing, discrete, detectors and observatories. To date research has been focused on detecting single air showers, while search ensembles events induced by super-preshowers a scientific terra incognita - CREDO explores this uncharted realm. Positive detection would have impact ultra-high energy...
We model the phase-space distribution of kinematic tracers using general, smooth functions to derive a conservative lower bound on total mass within ≈150−200 kpc. By approximating potential as Keplerian, can be simplified that energies and eccentricities. Our approach naturally allows for calculating moments function, such radial profile orbital anisotropy. systematically construct family with resulting velocity dispersion overlapping one obtained data motions distant tracers, while making...
The main objective of the Cosmic-Ray Extremely Distributed Observatory (CREDO) is detection and analysis extended cosmic ray phenomena, so-called super-preshowers (SPS), using existing as well new infrastructure (cosmic-ray observatories, educational detectors, single detectors etc.). search for ensembles events initiated by SPS yet an untouched ground, in contrast to current state-of-the-art analysis, which focused on events. Theoretical explanation could be given either within classical...
Observations suggest a slower stellar rotation relative to gas in the outer part of Milky Way Galaxy. This difference could be attributed an interaction with interstellar magnetic field. In simple model, fields order 10 micro Gauss are then required, consistently observed values. coincidence suggests tool for estimating spiral galaxies. A North-South asymmetry Galaxy origin too.
Ring mass density and the corresponding circular velocity in thin disk model are known to be integral transforms of one another. But it may less familiar that can reduced one-fold integrals with identical weight functions. It practical value for surface does not involve derivative, unlike equivalent widely Toomre's formula.
A few systematizing remarks concerning a spherically symmetric approximation in the description of compact stars with gravitationally strong magnetic fields are given, including problem definition mass accounting for electromagnetic contribution. The effective charges associated method is addressed. Two simple models ultrastrong ${10}^{17}--{10}^{18}\text{ }\text{ }\mathrm{Gs}$ studied limiting exact spherical symmetry, which limit considered approximations. Under this condition...
Scaling relations with the bag constant parameter are investigated for strange quark matter (SQM) stars in presence of gravitationally strong magnetic fields minimally coupled matter, considering both massless and massive scenarios. Assuming a simple model such coupling under approximation spherical symmetry, phenomenological scaling formula maximum mass is derived as function surface field mass. This applicable all formally admissible values free parameters, strict retained only vanishing...