科学研究
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2024.11.11
Two Bridges in Galaxy Ecosystem: Star – InterStellar Medium Interaction and Observation – Theory Connection [EN]
The increasing sophistication of research and data quality has revealed a complex interplay between the internal and external environments of galaxies. While galaxies are demonstrably connected to their cosmic ecosystems, their interiors are also comprised of diverse components with intricate interactions, forming a "galaxy ecosystem". Stars and the interstellar medium (ISM) are two crucial con...
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2024.11.01
Breeding seeds to grow supermassive black holes in the cosmological context: theory and semi-analytical forecasts
Supermassive black holes (SMBHs) are indispensable components of galaxy ecosystems. Their origin, growth, and feedback to the host galaxies are among the most fundamental questions in galaxy formation. In this talk, I will introduce a theoretical framework that coherently describes the formation of SMBHs from their seeding epoch to the present within the cosmological context. I will show that t...
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2024.10.28
Constraints on the tensor-to-scalar ratio r via a likelihood-based, optimal lensing reconstruction
The cosmic microwave background (CMB) holds valuable information about the early Universe, including an imprint of its mass distribution that overshadows the faint signal from primordial gravitational waves, likely generated during inflation. Removing this imprint is crucial for future CMB observations to tightly constrain the tensor-to-scalar ratio r. This talk focuses on achieving the tightes...
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2024.10.21
The influence of GC evolution on the specific frequency in dwarf galaxies
The presence of large fractions of metal-poor stars in dwarf galaxies still belonging to GCs raises questions about cluster mass loss and their formation mechanisms. These high ratios of metal-poor GCs relative to the number of low-metallicity field stars could imply that clusters in dwarfs have not lost enough mass, compared to more massive galaxies, or that the formation of field stars was su...
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2024.09.23
Lyman-alpha Intensity Mapping with optical imaging surveys: Future prospects
Being the first spectral line of HI, Lyman-alpha permeates the cosmic web in emission. It has been largely used to study the close environment of galaxies and QSOs (Lyman-alpha blobs/nebulae); but being a resonant line it should scatter through the intergalactic medium. This should make Lyman-alpha an interesting candidate for Intensity Mapping (IM): the study of large-scale by integrating the ...
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