Conveners
Extragalactic astronomy and cosmology
- Tetsuya Hashimoto (NCHU)
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...
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...
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...
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...
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...
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...
