Tootfinder

Systematic non-thermal velocity increase preceding soft X-ray flare onset
Andy S. H. To, Abigail Burden, Deborah Baker, Henrik Eklund, David H. Brooks, Laura A. Hayes, Juan Mart\'inez-Sykora, Paola Testa, Jeffrey Reep, Miho Janvier, Shinsuke Imada, Julio Hernandez Camero, David M. Long, Teodora Mihailescu, Micah J. Weberg
https://

Systematic non-thermal velocity increase preceding soft X-ray flare onset
Non-thermal velocities, derived from spectral line broadening, can provide crucial insights into plasma dynamics before and during solar flares. To systematically study the pre-flare phase, we constructed a Hinode/Extreme-ultraviolet Imaging Spectrometer (EIS) flare catalog of 1,449 flares from 2011-2024. This enabled a large-scale analysis of flare loop footpoint non-thermal velocity evolution across different flare magnitudes (C, M, X-classes). Analyzing Fe VIII - Fe XXIV emission lines forme…

High-redshift AGN population in radiation-hydrodynamics simulations
Teodora-Elena Bulichi, Oliver Zier, Aaron Smith, Mark Vogelsberger, Anna-Christina Eilers, Rahul Kannan, Xuejian Shen, Ewald Puchwein, Enrico Garaldi, Josh Borrow
https://arxiv.org/abs/2507.11605

High-redshift AGN population in radiation-hydrodynamics simulations
High-redshift active galactic nuclei (AGN) have long been recognized as key probes of early black hole growth and galaxy evolution. However, modeling this population remains difficult due to the wide range of luminosities and black hole masses involved, and the high computational costs of capturing the hydrodynamic response of gas and evolving radiation fields on-the-fly. In this study, we present a new suite of simulations based on the IllustrisTNG galaxy formation framework, enhanced with on-…

Generation and Coherent Control of Dark-State Spatial Modes
Huai-Che Shia, Siang-Wei Shao, Wu-Cheng Chiang, Yu-Hung Kuan, I-Kang Liu, Teodora Kirova, Gediminas Juzeli\=unas, Yu-Ju Lin, Wen-Te Liao
https://arxiv.org/abs/2507.00558

Generation and Coherent Control of Dark-State Spatial Modes
The generation and dynamic control of the spatial mode of the dark-state polarization using electromagnetically induced transparency are theoretically investigated. We demonstrate that a combination of synthetic scalar and vector potentials can be employed to engineer discrete spatial modes of the dark state polariton, enabling quantum interference among these modes. We verify this concept by showing the Rabi oscillation between two spatial modes and stimulated Raman adiabatic passage among $Λ…

Deep learning-based segmentation of T1 and T2 cardiac MRI maps for automated disease detection
Andreea Bianca Popescu, Andreas Seitz, Heiko Mahrholdt, Jens Wetzl, Athira Jacob, Lucian Mihai Itu, Constantin Suciu, Teodora Chitiboi
https://arxiv.org/abs/2507.00903

Deep learning-based segmentation of T1 and T2 cardiac MRI maps for automated disease detection
Objectives Parametric tissue mapping enables quantitative cardiac tissue characterization but is limited by inter-observer variability during manual delineation. Traditional approaches relying on average relaxation values and single cutoffs may oversimplify myocardial complexity. This study evaluates whether deep learning (DL) can achieve segmentation accuracy comparable to inter-observer variability, explores the utility of statistical features beyond mean T1/T2 values, and assesses whether ma…

Spectroscopic Observations of Supra-Arcade Downflows
Ryan J. French, Maria D. Kazachenko, Teodora Mihailescu, Katharine K. Reeves
https://arxiv.org/abs/2505.22624

Spectroscopic Observations of Supra-Arcade Downflows
Despite their somewhat-frequent appearance in EUV imaging of off-limb flares, the origins of Supra-Arcade Downflows (SADs) remain a mystery. Appearing as dark, tendril-like downflows above growing flare loop arcades, SADs themselves are yet to be tied into the standard model of solar flares. The uncertainty of their origin is, in part, due to a lack of spectral observations, with the last published SAD spectral observations dating back to the Solar and Heliospheric Observatory / Solar Ultraviol…