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te chun wang (retired teacher)Poster
Discussions are made on an alternative interpretation for the Hubble constant of red-shift. The expansion of the space is relaxed to a relative scaling between the space and the matter with gravity. The possible mechanism and results including the energy difference between space and matterd are discussed.
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Po-Han Chen (ASIAA)Poster
The Transiting Exoplanet Survey Satellite (TESS) was primarily designed to monitor stellar light curves and detect exoplanets. However, its full-frame images (FFIs) could be valuable for studying low surface brightness objects. In this work, we construct a full-sky map from TESS image patches in HEALPix format with a pixel size of 1.7'×1.7'. To enhance the usability of the map for...
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Po-Yen HuangPoster
Understanding the distribution of molecular hydrogen (H₂) is essential for studying star formation in galaxies. However, direct observations of H₂ are difficult. Carbon species such as carbon monoxide (CO) and ionized carbon (C⁺) might be used as good tracers of molecular hydrogen, as their formation is closely related to the presence of H₂.
In this study, we perform high-resolution galaxy...
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Tzu-Yin Hsu (National Tsing Hua University)Poster
The enigma of the missing baryons poses a prominent and unresolved problem in astronomy. Dispersion measures (DM), serving as a distinctive observable of fast radio bursts (FRBs), quantify the electron column density along each line-of-sight, revealing the missing baryons described in the Macquart (DM-z) relation. The scatter of this relation is anticipated to be caused by the variation of...
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Mr HaoMin Wu (0900850119jk@gmail.com)Poster
This study aims to investigate the properties of host galaxies of Fast Radio Burst (FRB). We begin by extracting FRB event data from the Transient Name Server (TNS), using their sky positions (Right Ascension and Declination) and observed Dispersion Measures (DMs) to identify potential host galaxy candidates. By cross-matching with astronomical catalogs such as SDSS and Gaia, we filter out...
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Pei-Cheng Tung (ASIAA)Poster
Massive stars end their lives in powerful explosions known as supernovae (SNe), which evolve into supernova remnants (SNRs). SNRs carry the legacy of their progenitor stars, enriching the interstellar medium (ISM) with stellar material and playing a crucial role in shaping the ISM
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ecosystem within galaxies.
In this study, we present the high-resolution simulations of SNRs in dwarf galaxies... -
Tsung Ching Yang (NCHU)Poster
Fast radio bursts (FRBs) are millisecond-duration, coherent radio transients with unknown origins. They are generally classified into two types: repeating and non-repeating FRBs. These two categories are believed to arise from different physical mechanisms—for instance, starquakes on neutron stars for repeaters, and binary mergers for non-repeaters. Therefore, determining whether an FRB is a...
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Albert KongPoster
Fast radio bursts (FRBs) are millisecond-duration radio transients whose population characteristics remain poorly constrained. This study applies capture-recapture analysis, an established statistical method in ecology and epidemiology, to estimate the unseen population of FRBs based on repeat detections from current radio surveys. By treating FRB detections as "captures" and accounting for...
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Steven Chen (0939977281)Poster
We aim to study the intrinsic alignment (IA) properties of galaxy clusters within the large-scale structure (LSS) of the Universe. This task was usually carried out by using an optically selected sample of galaxy clusters, whose member galaxies are identified by optical cluster finders that can be directly used to estimate the projected shapes of the halos. However, optically selected clusters...
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Daniel Baker (ASIAA)Poster
Pulsar dispersion measures have long been an important probe of the distribution of free electrons in the interstellar medium (ISM). However, the cadence of pulsar observations, combined with the uncertainty on individual dispersion measure measurements limits our ability to probe small scale variations in the ISM. Here, we present a novel method for measuring changes in dispersion measure...
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Yi-Yang Li (National Tsing Hua University)Poster
Aims. Cold gas ( $T \sim 10^4$ K) filamentary structures with H$\alpha$ emissions were found around central regions of some
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cool-core galaxy clusters. We wish to compare the results
between the observation of the Perseus cluster and our simulation
in order to interpret velocity structures of observed filaments.
Methods. We perform hydrodynamic simulations to trace gas
motions in... -
You-Lun Lin (Graduate Institute of Astronomy, NCU)Poster
Galaxy clusters are the most massive gravitationally bound systems and represent the most recently formed structures in the Universe under the hierarchical formation model. In this work, we reconstruct the dynamical mass profiles of galaxy clusters from the TNG300 and TNG-Cluster simulations by numerically solving the Jeans equation based on the kinematics of member galaxies. By comparing our...
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Ms Yuri Uno (NCHU)Either
The Search for Extraterrestrial Intelligence (SETI) has historically concentrated on detecting technosignatures within the Milky Way, targeting individual stars. The absence of confirmed signals over six decades may stem from the narrow scope of these efforts. This study shifts the SETI framework to galaxy clusters, where advanced civilizations—potentially at higher Kardashev scale...
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I-HSUAN LI (National Cheng Kung University)Either
We present weak lensing shear measurements of two ICM-selected galaxy cluster samples. The cluster samples, RASS-MCMF and ACT-DR5 MCMF, are selected by applying the Multi-Component Matched Filter (MCMF) algorithm to the second ROSAT All-Sky-Survey (RASS) source catalog (2RXS) and the ACT-DR5 dataset, respectively. For the RASS-MCMF catalog, 171 out of 8449 clusters within the redshift range...
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Ming Jhe Tsai (National Taiwan university)Poster
Previous studies have investigated the quenching mechanisms of quiescent galaxies at high redshift. However, due to limitations in angular resolution and sample size, the underlying processes remain poorly understood. In this study, as an initial step, we aim to explore the quenching process by analyzing the spatially resolved color profiles of quiescent galaxies at $z > 3$ using data from...
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Jacob Yen (National Taiwan University)Either
The interstellar medium (ISM) is inherently non-uniform. The inhomogeneous structures on both large and small scales influence the propagation of EM waves. Theoretical studies and simulations of the ISM are typically performed on parsec-scale resolution, yet, structures on AU or sub-AU scales are not well explored. Pulsar scintillation is a powerful probe of the small scale structures...
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Tz-En Gau (National Taiwan University)Poster
The interstellar medium (ISM) is fundamental to star formation and galaxy evolution, with dust serving as a pivotal regulator of various astrophysical processes. Yet, the mechanisms driving dust evolution in stellar feedback–dominated environments remain elusive. While photoionization feedback from massive stars—responsible for generating HII regions and reshaping the ISM’s structure and...
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Wen-Chi Hua (National Cheng Kung University)Poster
In this project, our goal is to measure the stellar mass function of galaxy clusters selected in X-rays in the eROSITA Final Equatorial Depth Survey (eFEDS), which is the deepest X-ray survey over a contiguous footprint.
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The sample consists of galaxy clusters spanning a mass range of $10^{13}\,h^{-1}M_\odot \leq M \leq 10^{15}\,h^{-1}M_\odot$, and a redshift range of $0.1 < z_{\mathrm{cl}} <... -
Bovornpratch Vijarnwannaluk (ASIAA)Poster
Statistical X-ray AGN studies show that the fraction of obscured active galactic nuclei (AGN) increases towards the early universe, indicating that most of the supermassive black hole (SMBH) growth occurs behind large amounts of gas and dust. Models of AGN obscuration by a dusty torus cannot simply account for the increased fraction of absorbed sources, indicating additional obscuring...
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Ms Pon-Yin Wang (Tamkang University)Poster
Galaxy interactions play a crucial role in the evolution of galaxies in the local universe, often triggering enhanced star formation. Simulations consistently suggest that such interactions significantly reshape the distribution of molecular gas within galactic disks, thereby altering the spatial distribution of star formation. In this study, we aim to observationally investigate the...
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Chia-Ching Lin (Department of Physics, National Central University)Either
The cosmic infrared background (CIB) originated from reprocessed dust emission after dust in galaxies absorbs the UV light from young massive stars and accreting supermassive blackholes. Resolving the diffuse CIB into individual galaxies provides insights into the cosmic star-forming activities that are obscured at the optical wavelength. Previous studies have constructed number counts of...
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I-Da Chiang (ASIAA)Poster
Recent studies with JWST and ALMA have revealed an almost-linear scaling relation between mid-infrared polycyclic aromatic hydrocarbons (PAHs) and CO J=2-1 (tracing H2) emissions at hundred-parsec resolution. This scaling relation could be a powerful tool for studying neutral gas structure within molecular clouds. However, whether this gas-PAH relation holds in atomic-gas-dominated...
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Zi-Jia Lai (National Cheng Kung University)Poster
Fast Radio Bursts (FRBs) are millisecond-duration radio wave transients that emit enormous energy with unknown origins. In this project, we aim to constrain the environment of galaxies hosting FRBs by measuring their cross correlations with other populations of galaxies. To explore the methodology, we construct realistic mock catalogs of FRBs and galaxies using a semi-analytical method.
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