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HUAI-MIN WANG (National Taitung University)Poster
This study aims to investigate the characteristics of X-ray sources in elliptical (E), lenticular (S0), spiral (S), and active/interacting galaxies, and analyze their relationship with star formation activity. We use X-ray data from the Chandra X-ray Observatory, combined with infrared observations from Spitzer and Herschel, to estimate the star formation rate (SFR) using the X-ray luminosity...
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Szu-Ting Chen (NTHU, ECAP)Poster
Cosmic rays (CRs) influence the ionization, heating, and astrochemistry of interstellar molecular clouds. Their propagation through the complex structure of these clouds remains unsettled but appears to transition from diffusion in magnetized turbulent regions to ballistic streaming in dense cores. Efforts to characterize CR diffusion under varying physical conditions have produced a wide...
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Che-Wei Pai (LeCosPA, NTU)Poster
Ultra-high energy (UHE) neutrinos and cosmic rays not only provide critical insights into high-energy astrophysical phenomena but also serve as probes for physics beyond the energy scales accessible by human-made accelerators. The Taiwan Astro-Particle Radiowave Observatory for Geo-synchrotron Emissions (TAROGE) is an experimental project designed to detect radio emissions from extensive air...
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Jun-Lei Wu (Institute of Astronomy, National Central University)Poster
The ultra-compact low mass X-ray binary 4U 1820-30 exhibits a ~3% orbital modulation in its X-ray light curve with a period of 685 seconds, along with a superorbital modulation where the flux varies by a factor of 2 over a period of ~170 days. Zdziarski et al.(2007), using early RXTE data, discovered a correlation between the amplitude of the orbital modulation and the accretion rate,...
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He-Feng Hsieh (Institute of Astrophysics and Department of Physics, National Taiwan University)Poster
Multi-dimensional instabilities coupled with magnetic fields, such as the magnetorotational instability (MRI), are considered important contributors to the explosion mechanism of core-collapse supernovae in extreme scenarios. In this work, we present three-dimensional simulations of a 40-solar-mass progenitor using the GPU-accelerated magnetohydrodynamics code GAMER. We investigate the effects...
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Hao-Min ChangPoster
The Gamma-ray Transients Monitor (GTM) is a science payload on the Taiwanese satellite Formosat-8B, designed to detect GRBs and other gamma-ray transients in the 50 keV to 2 MeV range. It consists of two detector units, each with four sensor modules using GAGG(Ce) scintillators and Silicon Photomultipliers (SiPMs), providing all-sky coverage.
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In this report, we present the energy calibration... -
Chiung-Yin Chang (National Tsing Hua University, Institute of Astronomy)Poster
We use 3D special relativistic hydrodynamic (SRHD) simulations to study AGN-driven winds in a disk galaxy. Our results reveal an early-stage (t ~ 0.1 Myr) asymmetry in bubble formation, with one bubble reaching velocities up to 2000 km/s while the other remains underdeveloped due to interactions with the clumpy disk. This aligns with JWST observations of NGC 7469, which show a circumnuclear...
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Chang-Mao Yang (Department of Physics, National Tsing Hua University)Poster
Chiral effects induced by quantum anomalies, such as the chiral magnetic effect, are expected to influence the dynamics of core-collapse supernovae (CCSN). These effects arise in strong magnetic fields and rapid flows, which are common in supernova cores. In this project, we investigate the potential impact of chiral neutrino radiation transport in CCSN, focusing on contributions from...
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Afif Ismail (National Taiwan Normal University)Poster
The observation of the M87* black hole shadow has opened new avenues for exploring horizon-scale phenomena around astrophysical black holes.
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Current interpretations of black hole images often rely on state-of-the-art general relativistic magnetohydrodynamics (GRMHD) simulations to model ion
temperatures, combined with post-processed radiative modeling of electron radiation. However, these... -
Yu-Chen Lee (National Taitung University)Poster
Fast Radio Bursts (FRBs) are high-energy, transient phenomena with extremely short durations, and their origin remains uncertain. Various theories have been proposed to explain their mechanism. Among these, FRB 200428 has been confirmed to originate from the magnetar SGR 1935+2154, providing a potential model for understanding other FRBs. In this study, I use the physical parameters of FRB...
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Ashwin Aravindaraj (Institute of Astronomy, National Tsing Hua University)Either
Supernova remnants (SNRs) are considered the primary sources of Galactic cosmic ray acceleration. Particles are energized at the shock front of SNR through the diffusive shock acceleration mechanism, gaining energy by repeatedly crossing the shock. Magnetic turbulence plays a crucial role in scattering these particles back and forth; therefore, investigating this turbulence is essential for...
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Kaustubha Sen (PhD Student)Poster
This paper reports the localization performance analysis of a compact GRB monitor to fly on a future cubesat. This proposed GRB monitor consists of four hexagonal CsI scintillator detectors of geometric area 12.5 $cm^{2}$ encased in 2 mm thick aluminium (Al7075) on the sides and one square detector of area 8 $cm^{2}$ on the top. All detectors have a thickness of 0.5 cm. The base of the...
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Damien Koon (Florida Institute of Technology), Krupa Pothiwala (Florida Institute of Technology)Poster
The Rubin and Roman telescopes will come online soon and are expected to detect over 1000 “orphan afterglows” per year: broad-band long lasting emission from a gamma-ray burst (GRB), but without the GRB. Having a method to extract the physical parameters of these orphan afterglows will give us a better understanding of the progenitor systems. We start with a model that takes physical...
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Debjit Chatterjee (Postdoctoral Research Fellow, National Tsing Hua University)Either
We present an in-depth analysis of the timing and spectral properties of NGC 7314, a Seyfert 1.9 galaxy, using data from XMM-Newton, NuSTAR, and RXTE/PCA. Our timing analysis reveals significant variability across multiple energy bands, with fractional variability (Fvar). We observe that soft X-ray photons exhibit greater variability compared to harder photons, suggesting distinct emission...
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Chin-Ping Hu (National Changhua University of Education)Poster
SMC X-1 is a high-mass X-ray binary exhibiting an X-ray pulsar with a ~0.7 s spin period and a non-stationary superorbital modulation ranging from ~40 to ~65 days. Its luminosity of 5E38 erg/s makes it a local analogue of ultraluminous X-ray pulsars, powered by supercritical accretion. To investigate whether SMC X-1's superorbital modulation originates from a change in the mass accretion rate...
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Tzu-Hsuan Lin (國立清華大學)Poster
Pulsars are fast-rotating and strongly magnetized neutron stars. They emit radio waves in an intense, narrow beam that sweeps across the observer. However, their radiation mechanisms have remained mysterious. This study presents the observational connection of radio emission from X-ray-emitting pulsars with their X-ray spectral properties. We found that pulsars’ radio luminosity is tightly...
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Chung-Ming KoPoster
In the hydrodynamic approach to cosmic-ray propagation, cosmic rays and self-excited Alfven waves are considered as massless fluids. We study the three-fluid model, which comprises thermal plasma, cosmic rays and forward propagating Alfven waves. The coupling of cosmic rays to the plasma or their diffusion coefficient depends on the waves. We have classified all possible physically allowable...
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Surojit Saha (Institute of Astronomy, National Tsing Hua University, Taiwan)Poster
Physics-inspired neural networks (PINNs) have gained considerable importance in recent years in the domain of Astronomy & Astrophysics, particularly, being a potential tool to solve differential equations within the given boundary conditions, not limiting to accurate predictions but also providing efficient approach for large computations. In this work, we have focused on solving the kilonova...
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Yi-Chan Han (National Yang Ming Chiao Tung University)Poster
Supernovae explosion (SNe) are among the most energetic astrophysical phenomena, where the ejecta from a stellar explosion collides with a dense circumstellar medium (CSM), leading to intense shock interactions and enhanced radiation output. We employ two-dimensional radiation hydrodynamics (RHD) simulations using the CASTRO code, incorporating adaptive mesh refinement (AMR) to model the...
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Yo-Yo ChuPoster
Rapidly rotating core-collapse supernovae are key to the formation of exotic compact objects such as magnetars and are potential sources of strong gravitational wave emission. Binary interaction offers one of the most promising pathways to spin up massive stars and endow them with high angular momentum at the point of collapse. In this study, we employ the stellar evolution code MESA to...
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Chih-En Wu (IoA, NTHU)Poster
The Gamma-ray Transients Monitor (GTM) is a secondary payload on board Formosat-8B (FS-8B). It aims to monitor Gamma Ray Bursts (GRBs) and other bright gamma-ray transients in the energy range from 50 keV to 2 MeV. GTM consists of two modules, each positioned on opposite sides of the FS-8B. Each module's sensors cover half of the sky. As a result, GTM can detect signals from all directions...
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Yi-Fang Li (NTHU)Either
Core-collapse supernovae (CCSNe) are the birthplace of neutron stars and stellar-mass black holes (smBH), albeit the exact explosion engine(s) remain elusive. Observationally, magnetized CCSNe have been linked to long gamma-ray bursts and magnetars. In this project, we investigate the magneto-hydrodynamics and rotational effects on core-collapse supernova dynamics and multimessenger signals...
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Bo-Chun ChenPoster
X2127+119 is a dipping low mass X-ray binary system located at the globular cluster M15 with an orbital period of 0.713 day. To refine the orbital ephemeris, we analyzed the light curves collected by HEAO-1, EXOSAT, Ginga, ASCA, BeppoSAX, XMM-Newton, RXTE, Chandra, and MAXI, with a total time span of 47 years from 1977 to 2024. The orbital modulation profiles, obtained by folding the light...
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Meng-Hung Hou (National Tsing Hua University)Poster
We present a follow-up X-ray study of the redback millisecond pulsar PSR J2215+5135. PSR J2215+5135 was discovered as a radio pulsar with an orbital period of 0.17 day. It is in a compact binary system with a low-mass companion of 0.33 $\text{M}_\odot$ (Linares, et al., 2018).
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Observationally, redback systems occasionally exhibit a double-peaked structure in their X-ray light curves. This...
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