arXiv subjects

Aristeidis Polychronakis

Publications and source records attributed to Aristeidis Polychronakis.

3 recordsLinked to original sources

arXiv2026

Tracking down the broadband polarimetric properties of PG 1553+113

We report on a nine-month monitoring campaign of the blazar PG 1553+113, relying on three observations carried out in 2025 with the Imaging X-ray Polarimetry Explorer (IXPE) and supported by multi-wavelength facilities. The source displayed pronounced variability across the electromagnetic spectrum, with X-ray flux changes by up to a factor of $\sim5$ and complex evolution of the optical polarization properties, including one of the largest (exceeding $150^{\circ}$) and fastest rotations in the electric vector position angle (EVPA) ever recorded. This swing of the EVPA was also accompanied by a temporary drop of the optical polarization degree to nearly zero. Significant X-ray polarization was observed during the third IXPE pointing, with a polarization degree $\Pi_{\rm X}\,=(\,18.4\,\pm\,5.8)\%$ and $\Psi_{\rm X}\,=\,74^{\circ} \pm 9^{\circ}$ in the 2--8~keV band, while only upper limits were obtained in the first two epochs. The optical data show that the second IXPE observation occurred shortly after a dramatic optical polarization event characterized by a rapid EVPA swing and strong depolarization. Two possible scenarios may explain the broadband polarimetric behavior: (i) the superposition of two emitting regions with nearly orthogonal magnetic field configurations and variable relative contributions, and (ii) the interaction of a single emitting region with a shock that temporarily reorders the magnetic field. In both cases, the data support a picture in which the X-ray and optical emissions arise from closely related but not strictly co-spatial regions within a dynamically evolving, magnetically structured jet.

astro-ph.HE↗

arXiv2025

Intra-night optical polarization monitoring of blazars

Blazars are known for their extreme variability across the electromagnetic spectrum. Variability at very short timescales can push the boundaries between competing models offering us much needed discriminating power. This is particularly true for polarization variability that allows us to probe particle acceleration and high-energy emission models in blazars. Here we present results from the first pilot study of intra-night optical polarization monitoring conducted using RoboPol at the Skinakas Observatory and supplemented by observations from the Calar Alto, Perkins, and Sierra Nevada observatories. Our results show that while variability patterns can widely vary between sources, variability on timescales as short as minutes is prevalent in blazar jets. The amplitude of variations are typically small, a few percent for the polarization degree and less than 20 degrees for the polarization angle, pointing to a significant contribution to the optical emission from a turbulent magnetic field component, while the overall stability of the polarization angle over time points to a preferred magnetic field orientation.

astro-ph.HE↗

arXiv2025

A three-step approach to reliably estimate magnetic field strengths in star-forming regions

The magnetic field is known to play a crucial role in star formation. Dust polarization is an effective tool for probing the morphology of the field, yet it does not directly trace its strength. Several methods have been developed, combining polarization and spectroscopic data, to estimate the strength of the magnetic field, including the DCF method, which relates these quantities to the magnetic-field strength under the assumption of Alfv\'enic turbulence. Skalidis & Tassis (2021) (ST), relaxed this assumption to account for the compressible modes, deriving more accurate estimates of the field strength. We evaluate the accuracy of these methods in star-forming regions and propose a systematic approach for calculating the key observational parameters involved: the velocity dispersion (dv), the dispersion of polarization angles (d\theta), and the cloud density (rho). We use a 3D MHD chemodynamical simulation of a turbulent molecular cloud and generate synthetic observations, for seven different inclination angles. We employ various approaches for estimating the parameters dv, d\theta, and rho and find that the approach used to calculate these parameters plays a crucial role in estimating the magnetic field strength. We show that the value probed by both the DCF and ST methods corresponds to the median of the molecular-species-weighted POS component of the magnetic field. The ST outperforms DCF, accurately following the expected cosine trend with respect to the inclination angle, and remains within 1\sigma from the true strength of the field. Based on our analysis, we proposed that, in self-gravitating clouds, the intrinsic parameters (rho, dv, d\theta) should be calculated as follows: rho using radiative transfer analysis, dv using the second moment maps, and d\theta by fitting Gaussians to the polarization angle distributions to remove the contribution of the hourglass morphology.

astro-ph.GA↗