Conveners
Galaxies
- Tetsuya Hashimoto (National Chung Hsing University)
Galaxies
- Hsi-An Pan (Tamkang University)
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Guan-Hong Li (National Tsing Hua University)5/16/26, 11:00 AMOral
This study investigates the origin of Odd Radio Circles (ORCs) by modeling them as remnants of active galactic nucleus (AGN) feedback using the JET semi-analytical framework. Motivated by observed host galaxy properties and recent simulations suggesting that ORCs represent relics of AGN activity following a phase of rapid supermassive black hole (SMBH) growth, we identify candidate hosts with...
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Chiung-Yin Chang (National Tsing Hua University, Institute of Astronomy)5/16/26, 11:15 AMOral
Active galactic nucleus (AGN) feedback drives powerful outflows that play a crucial role in galaxy evolution. The physical origin of asymmetric outflow structures seen in observations remains unclear, as such asymmetries are often attributed to dust obscuration rather than being intrinsically produced. Recent infrared observations with JWST of NGC 7469, however, reveal intrinsically asymmetric...
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Jie Shiuan Gong5/16/26, 11:30 AMOral
Fast radio bursts (FRBs) are millisecond-duration radio transients whose physical origin remains unknown. Different progenitor channels are expected to arise in distinct host-galaxy environments. However, most previous studies have been limited to analyses of entire host galaxies rather than the immediate environments of FRB sites. Spatially resolved studies are therefore essential for placing...
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CHUAN-KENG CHUANG5/16/26, 11:45 AMOral
Fast Radio Bursts (FRBs) are energetic, millisecond radio signals from cosmological distances. The nature of FRBs, especially their short duration, leads to a lack of well-localized FRBs, being the major challenge for studies on FRB progenitors. The key measurement is the delay time between FRB emergence and past star formation in their host galaxy, called the delay time distribution (DTD)....
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Yu-Ling Chang5/16/26, 12:00 PMOral
The physical origins of the cool gas traced by Mg II absorption lines around massive galaxies remain an open question. Previous studies have suggested that the cool gas around luminous red galaxies (LRGs) may be associated with their satellite galaxies. In this talk, I will present our effort to test this scenario. We use the largest sample of LRG–QSO pairs from the Dark Energy Spectroscopic...
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I-Hsuan Li (National Cheng Kung University)5/16/26, 1:45 PMOral
We constrain the X-ray count rate-mass relation of 7408 RASS X-ray selected galaxy clusters at $0.05 < z < 1$. The sample is further optically confirmed based on the optical imaging from Legacy Survey DR9 and DR10, leading to a sample purity at $90\%$. We measure the weak-lensing shear profiles using the Hyper Suprime-Cam (HSC) Y3 data set, resulting in a total signal-to-noise ratio of $30.9$....
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Wen-Chi Hua (National Cheng Kung University)5/16/26, 2:00 PMOral
We aim to measure the stellar mass content and luminosity function of 6,439 X-ray selected galaxy clusters from the all-sky RASS-MCMF catalog, using WISE W1 (3.4 μm) photometric data. Our sample spans a mass range of $10^{13}M_\odot \lesssim M \lesssim 10^{15}M_\odot$ and redshifts $0.05 <z_{cl}< 0.4$. We use the unWISE catalog with a limiting magnitude of W1 ≈ 20.45 mag.
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In our work, we... -
Rajashree Bhuyan (National Taiwan University, Department of Physics)5/16/26, 2:15 PMOral
Recent observations with the James Webb Space Telescope (JWST) are revealing an increasing number of quiescent galaxies that had already stopped forming stars when the Universe was only a few billion years old. Given the limited time available for secular evolution at these early epochs, the existence of such quenched systems suggests that their star formation was abruptly shut down....
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Angel Rodriguez Barbosa (National Tsing Hua University)5/16/26, 2:30 PMOral
Active galactic nuclei (AGN) are pivotal drivers of galaxy evolution, yet many remain undetected in ultraviolet and optical surveys due to heavy dust obscuration. Tracking the AGN infrared (IR) contribution and number fraction (AGN fraction of IR-selected galaxies) provides insight into the dominance of AGN activity within galaxies and how common AGNs are across cosmic time. In these systems,...
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Ryuichiro Hada (ASIAA)5/16/26, 2:45 PMOral
Accurate modeling of small-scale redshift-space clustering is crucial for full-shape RSD analyses, where satellite galaxies contribute to 1-halo terms and Finger-of-God distortions. We study halo reconstruction with the cylinder-grouping method of Okumura et al. (2017), which selects an effective halo-center tracer from the observed galaxy distribution. Using DESI-like LRG mocks from...
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Mr Deriyan Senjaya (Department of Physics NTHU Taiwan)5/16/26, 3:00 PMOral
The Fermi Paradox poses a fundamental question: why, given the immense age and scale of the Universe, have we not observed evidence of advanced civilizations beyond our own? Explanations range from sociological ideas such as the zoo hypothesis to the possibility that advanced civilizations are inherently undetectable. An alternative line of inquiry emphasizes astrophysical causes. Previous...
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Tsz Hei Chan (NTHU)5/16/26, 3:15 PMOral
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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Yong Tian (National Central University)Poster
We present a unified study of the baryonic Faber–Jackson relation (BFJR) and the fundamental plane (FP) for pressure-supported systems spanning eight orders of magnitude in baryonic mass, from dwarf spheroidals to galaxy groups. Using a homogenized sample of about 1400 systems, we show that both relations depend systematically on the mean internal baryonic acceleration, with a transition...
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Namitha Kizhuprakkat Ramachandran (National Tsing Hua University)Poster
The assembly history of our Galaxy is encoded in the chemodynamical properties of its stellar populations. In this talk, I will present our work on 88,959 K-giant stars selected from three years of data from the DESI Milky Way Survey (MWS) to characterize our Galaxy’s distant stellar halo. Running HDBSCAN, a density-based clustering algorithm on integrals of motion (Energy, Lz, L⊥) and...
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