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Chen Chen (National Chen Kung University)Poster
The magnitude gap (Δm₁₄), defined as the magnitude difference between the brightest cluster galaxy (BCG) and the fourth brightest galaxy in a cluster, is widely used to probe the formation history of dark matter halos and the dynamical age of galaxy clusters. For example, early-forming clusters are expected to exhibit large magnitude gaps due to galaxy merging.
In this work, we utilize the...
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Yu-Ren Lin (ASIAA/NTU)Poster
Galaxy clusters are the largest gravitationally bound structures, residing at the nodes of the cosmic web. They provide key insights into galaxy formation and constrain the growth of structure and underlying cosmology. Across all areas of cluster science, robust cluster finding is fundamental, yet current methods, based on optical, X-ray, and Sunyaev–Zel'dovich (SZ) observations, each exhibit...
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Dr Angelo George (ASIAA, Taipei)Poster
I present findings from our recent study (George et al., 2025, ApJ 987, 45), investigating environmental impacts on the size evolution of massive (log stellar mass > 9.5) quiescent galaxies (QGs). Using CLAUDS+HSC imaging over 18.6 deg², we studied ~86,000 field and ~1,000 cluster-core QGs at redshifts 0.1 to 0.85. We measured effective radii at rest-frame 3000Å (UV) and 5000Å (optical), as UV...
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Yu-Chen Chu (National Taiwan University)Poster
The interstellar dust content of a galaxy is closely linked to its star formation. While it is well-established that star-forming galaxies are dust-rich and quiescent galaxies are largely dust-poor, the timeline and drivers of dust depletion immediately following the end of star formation (quenching) remain poorly understood. Understanding this depletion timescale is crucial, as it reveals how...
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Wei-Shan SuPoster
Galactic outflows are thought to be a primary channel for transporting dust grains out of galaxies, especially in dwarf galaxies due to their shallower gravitational potential. However, the existence of CGM dust challenges our understanding of dust evolution, as the conditions in outflows are hostile, where dust grains are expected to be rapidly destroyed by sputtering. We present...
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tzuning YenPoster
Understanding how galaxies evolve over cosmic time is a central goal of modern astrophysics and requires a detailed understanding of the baryon cycle. More than 80% of the baryons associated with galaxies reside in the circumgalactic medium (CGM), making it a key driver of galaxy evolution. Quasar absorption line surveys of distant galaxies show that approximately 20-25% of galaxy halos...
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Yi-Ping Hung (Department of Physics, National Taiwan University)Poster
Double-peaked (DP) emission lines have been revealed via galaxy spectroscopic observations. However, the physical drivers giving rise to the profiles and the underlying galaxy population remain poorly understood. In this poster, I will present our exploration of the DP galaxy properties by utilizing the largest spectroscopic dataset provided by the Dark Energy Spectroscopic Instrument (DESI)....
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Mr Pei-Cheng Tung (ASIAA)Poster
We present the first simulation of the formation and evolution of a supernova remnant (SNR) in a realistic interstellar environment drawn directly from a galactic simulation. Our study employs magneto-hydrodynamical simulations with the GIZMO code, including detailed interstellar medium (ISM) physics. Unlike previous studies that assume idealized environments, our pre-explosion conditions are...
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佳蓁 余Poster
In this work, we measure and model the galaxy number density radial profiles of eFEDS clusters using HSC-SSP galaxies. The eFEDS clusters have redshift $< 1.31$ and virial masses $\mathrm{∼10^{14} M_\odot/h}$. We divide the cluster sample into 26 subsamples based on redshift and virial mass.
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For each subsample, we observe the mean galaxy number density radial profile within a radius of 3... -
Angelo George (ASIAA, Taipei)Poster
I investigate spatially resolved star formation and gas properties in KILOGAS galaxies using ALMA and optical IFU data, as part of my ongoing work at ASIAA, through radial profiles of specific star formation rate (sSFR), gas fraction ($f_g$), and star formation efficiency (SFE). Galaxies are divided into star-forming, green valley, and quiescent populations to probe evolutionary pathways. I...
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te chun wang (retired teacher)Poster
A field flux picture with generalized Integral Gauss’s law of gravity is proposed for an alternative solution for mass discrepancy problem of disk galaxies. The flat rotation curve of disk galaxies is modeled by a cylindrical distribution of the gravitational field flux along the disk surface and the radius dependence of the field strength becomes 1/r, instead of Newtonian 1/r^2.
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Ya-I Chen (National Yang Ming Chiao Tung University)Poster
In this study, we investigate the gravitational lensing effects of projected elliptical halos. We perform a comparative analysis of the Cored Steep Ellipsoid (CSE) model, the standard spherical NFW model, and the elliptical NFW model to assess their relative performance and accuracy.
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Within the CSE framework, we conduct a quadrupole shear analysis and further extend it to include higher order... -
Ting-Kai Yang (NTU/ASIAA)Poster
Submillimeter galaxies (SMGs) are characterized by high star formation rates (SFRs) and strong luminosities in the far-infrared and submillimeter regimes. They represent a key population in galaxy evolution, exhibiting extreme star-forming activity and large stellar masses. Near-infrared spectroscopy is particularly effective for characterizing SMGs, especially at cosmic noon (z ∼ 2) and...
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Srivardini Ayyappan (NTHU, Macquarie University)Poster
It is important to find and study protoclusters in the distant Universe during their formative stages in order to understand the formation and evolution of present-day galaxy clusters. In the pre-JWST era, protocluster candidates were primarily identified up to z ≲ 7, limited by optical wavelength coverage and survey area. Deep JWST near-infrared surveys such as CEERS and JADES have enabled...
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Tsz Hei Chan (NTHU)Poster
Accurate distance measurements are fundamental to understanding the formation and distribution of galaxies in the nearby universe. For faint and diffuse systems, such as dwarf and low-surface-brightness (LSB) galaxies, distances are needed to distinguish satellites from background systems, to derive physical properties such as mass and size, and to map the structure of the local volume (LV)....
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Dr Lapo Fanciullo (Tamkang University)Poster
Star formation is a fundamental process driving galaxy evolution. To understand how galaxies grow and transform, it is essential to study systems spanning a wide range of star formation activity. Moreover, since stars form from molecular gas, the properties of molecular gas also play an essential role in regulating galaxy evolution.
In this work, we compile molecular gas measurements traced...
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Po-Han Chen (ASIAA)Poster
The Transiting Exoplanet Survey Satellite (TESS), a space-based optical observatory, was primarily designed to monitor stellar light curves and detect exoplanets. However, its Full-Frame Images (FFIs) are also highly valuable for both galactic and extragalactic science, particularly in the low surface brightness (LSB) regime (Holwerda, 2018). We constructed a full-sky map from TESS image...
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Chia-Tse Wang (Graduate Institute of Astrophysics, National Taiwan University)Poster
We investigate the spatially resolved star formation histories (SFHs) of seven post-starburst (PSB) galaxies at $z \approx 0.6$--$1.0$ using multi-band imaging from the JWST/PRIMER--COSMOS and HST/CANDELS surveys. Combining rest-frame UV--to--near-IR coverage ($0.4$--$4.4~\mu$m), we perform pixel-by-pixel SED fitting to reconstruct the radial SFHs of individual galaxies. We first apply a...
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Hsi-An Pan (Tamkang University)Poster
Galaxy interactions and mergers are expected to redistribute baryons across galactic disks, yet how molecular gas and metals are reorganized as a function of merger stage remains poorly constrained. In this work, we investigate the radial structure of molecular gas and gas-phase metallicity using a large sample of nearby galaxies from the KILOGAS survey spanning a wide range of interaction...
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Chung-Wen Wang (National Tsing Hua University)Poster
We present a new framework for constructing stellar halo density profiles from galaxy merger histories without relying on particle-based simulations. An approximate but efficient approach allows us to capture the essential physics of tidal stripping and orbit evolution for large ensembles of stellar halo models, making it well suited for statistical studies of halo structure and assembly. We...
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HaoMin Wu (National Taitung University)Poster
Fast Radio Bursts (FRBs) often exhibit a downward frequency drift, known as the sad-trombone effect, even after removing dispersion. The physical origin of this phenomenon remains unclear and may arise from either intrinsic emission processes or propagation effects. In this work, we apply a plasma lensing model to investigate whether frequency-dependent propagation can account for the observed...
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Tz-En Gau (National Taiwan University)Poster
The CO-to-H$_2$ conversion factor $X_\text{CO}$ is commonly used to estimate the mass of molecular clouds in the interstellar medium (ISM), yet its applicability in galactic outflow remains poorly constrained. Starburst and AGN-host galaxies commonly exhibit high-velocity ($\gtrsim 100\ \mathrm{km\ s^{-1}}$) CO-emitting outflows. In these extreme environments, the density, temperature, and...
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Gutu Dereje Mekonen (National Tsing Hua University)Poster
We present a study of the relationship between large-scale environment and AGN activity across 0.5 ≤ z ≤ 5.0 in the GOODS-S field. This work combines two complementary JWST datasets in a two-layer approach: JADES DR5 serves as the environmental backbone, providing an exceptionally deep and wide photometric catalogue in the GOODS-S field from which local projected surface densities are...
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Yu Shan ChengPoster
We present a measurement of the redshift enhancement of background galaxies behind clusters. The 3,085 cluster sample is selected from RASS-MCMF with a redshift range of $0.05\leq z<0.4$. The background galaxies are obtained from DESI, including LRGs with redshifts 0.4-1.1 and ELGs with redshifts 0.8-1.6.
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The RASS-MCMF clusters are selected within a 10 Mpc of the DESI area. We center on each... -
Po-Yen HuangPoster
In typical star forming galaxies, cooling is dominated by fine-structure metal lines where H₂ formation occurs predominantly via the dust channel. However, in dwarf galaxies with extremely low metallicity, cooling and chemistry behave qualitatively differently. In this study, we perform high-resolution hydrodynamic simulations using the GIZMO code to investigate the thermal balance of the...
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Dr Angelo George (ASIAA, Taipei)Poster
Understanding how bulges and disks grow across cosmic time is key to uncovering the physical processes that shape galaxy evolution. We investigate the wavelength-dependent structural evolution of galaxies using a mass-complete sample of 44,000 star-forming galaxies (SFGs) and 34,000 quiescent galaxies (QGs) at z<0.85. By modelling bulges and disks separately in rest-frame UV (3000 Å) and...
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Mr HAO-WEN ZHENG (National Yang Ming Chiao Tung University)Poster
We present a joint strong and weak lensing analysis of Abell 370 using Hubble Space Telescope imaging from the BUFFALO survey and wide-field observations from Subaru/Suprime-Cam. By combining deep, high-resolution data with wide-field coverage, we reconstruct the mass distribution of the cluster from its core to the outskirts.
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Using Lenstool, we adopt a hybrid approach that incorporates fixed...
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