Conveners
Extragalactic astronomy and cosmology
- Tetsuya Hashimoto (NCHU)
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Jamie Chang (NTHU)5/16/25, 4:15 PMOral
Understanding gas dynamics in protoplanetary disks is crucial for searching the planet forming region and comprehending the evolution of planetary systems. Various observational signatures suggest the presence of protoplanets in the disk of HD 163296, such as CO kink structure. To expand our understanding of planetary systems, we aim to focus on the gas kinematic structure of HD 163296. In...
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Meng-Zhe Yang (National Tsing Hua University)5/16/25, 4:30 PMOral
We investigate the magnetic field properties in the massive star-forming region Onsala 2 (ON2) in Cygnus using 850 µm polarization observations from the B-Fields in Star-Forming Region Observations (BISTRO) survey, which is a Large Program of the James Clerk Maxwell Telescope (JCMT). Our data cover the entire ON2 complex at a resolution of 0.12 pc, allowing us to spatially resolve polarized...
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Mohanraj Madheshwaran (National Chung Hsing University)5/16/25, 4:45 PMOral
Fast Radio Bursts (FRBs) are enigmatic astrophysical phenomena that manifest as millisecond radio pulses. While the origin of FRBs is still unknown, observations confirm that some FRBs repeat and some do not apparently. In addition to the repetition nature, repeaters are known to show distinct physical properties from non-repeaters: broader pulses with narrower bandwidths for repeaters...
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Mr Jui-Kuan Chan (National Taiwan University)5/16/25, 5:00 PMOral
Millions of spectra have been collected by the Dark Energy Spectroscopic Instrument (DESI) survey. While the DESI survey is designed to observe specific types of sources, unexpected sources are often included and hidden within the dataset. In this talk, I will show that a fraction of the sources observed by DESI are galaxies producing strong Lyman-alpha emission lines, known as Lyman-alpha...
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Wen-Yen Wu (NTNU/ASIAA)5/16/25, 5:15 PMOral
The Hyper Suprime-Cam (HSC) offers high-resolution, wide-field imaging of the Universe. We explore the application of machine learning methods, specifically DEmP (Hsieh et al., 2014) and Convolutional Neural Networks (CNN), to predict spatially resolved stellar mass and star formation rate maps from HSC-SSP 5-band photometry using approximately 800 overlapping galaxies with MaNGA survey. We...
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Kent-Wei Wu5/16/25, 5:30 PMOral
High-redshift protoclusters are crucial for understanding the formation of galaxy clusters and the evolution of galaxies in dense environments. With its unprecedented near-infrared sensitivity, the James Webb Space Telescope (JWST) enables the first exploration of protoclusters beyond z>10. Among JWST surveys, COSMOS-Web offers the largest area (~0.5 deg^2), making it an optimal field for...
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HUNG-YU LIN (National Cheng Kung University)5/16/25, 5:45 PMOral
The galaxy luminosity function, which describes a number density of a galaxy population as a function of their luminosities, provides key insights into galaxy formation and evolution. In this study, we investigate the optical luminosity functions of galaxies in clusters identified in the eROSITA Final Equatorial-Depth Survey (eFEDS), spanning redshifts from 0.1 to 1.3 and halo masses between...
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Shouvik Roy Choudhury (Academia Sinica Institute of Astronomy and Astrophysics)5/16/25, 6:00 PMOral
Based on arXiv: 2409.13022 (published in ApJ Letters). We update constraints on cosmological parameters in a 12-parameter model, which extends the standard 6-parameter ΛCDM to include dynamical dark energy and massive neutrinos, along with other new parameters. We use the latest Planck PR4 (2020) likelihoods, DESI DR1 BAO, and the latest uncalibrated type Ia Supernovae (SNe) datasets. In this...
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