A5100781774- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Black Holes and Theoretical Physics
- Scientific Research and Discoveries
- Dark Matter and Cosmic Phenomena
- Image Retrieval and Classification Techniques
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Algebraic and Geometric Analysis
- Spectroscopy and Laser Applications
Nagoya University
2022-2025
Abstract The mean free path of ionizing photons, λ mfp , is a critical parameter for modeling the intergalactic medium (IGM) both during and after reionization. We present direct measurements from QSO spectra over redshift range 5 < z 6, including first at ≃ 5.3 5.6. Our sample includes data XQR-30 VLT large program, as well new Keck/ESI observations QSOs near ∼ 5.5, which we also acquire [C ii ] 158 μ m redshifts with ALMA. By measuring Lyman continuum transmission profile in stacked...
Abstract A direct approach to studying the galaxy-halo connection is analyze groups and clusters of galaxies that trace underlying dark matter halos, emphasizing importance identifying galaxy their associated brightest cluster (BCGs). In this work, we test propose a robust density-based clustering algorithm outperforms traditional Friends-of-Friends (FoF) in currently available group/cluster catalogs. Our new modified version Ordering Points To Identify Clustering Structure (OPTICS)...
Aiming at discriminating different gravitational potential models of the Milky Way, we perform tests based on kinematic data powered by Gaia DR2 astrometry, over a large range $(R,z)$ locations. Invoking complete form Jeans equations that admit three integrals motion, use independent $R$- and $z$-directional as two discriminators ($T_R$ $T_z$). We apply formula for spatial distributions radial vertical velocity dispersions proposed Binney et al., successfully extend it to azimuthal...
A direct approach to studying the galaxy-halo connection is analysis of observed groups and clusters galaxies that trace underlying dark matter halos, making identifying galaxy their associated brightest cluster (BCGs) crucial. We test propose a robust density-based clustering algorithm outperforms traditional Friends-of-Friends (FoF) in currently available group/cluster catalogs. Our new modified version Ordering Points To Identify Clustering Structure (OPTICS) algorithm, which accounts for...
We report the discovery of a two-dimensional Galaxy Manifold within multi-dimensional luminosity space local galaxies. The is constructed using 11 bands that span from far ultraviolet to near-infrared for redshift < 0.1 galaxies observed with GALEX, SDSS, and UKIDSS. two latent parameters are sufficient express 93.2% variance in galaxy sample, suggesting this one most efficient representations transformation between luminosities manifold as an analytic mapping provided. representation...
The mean free path of ionizing photons, $λ_{\rm mfp}$, is a critical parameter for modeling the intergalactic medium (IGM) both during and after reionization. We present direct measurements mfp}$ from QSO spectra over redshift range $5
Abstract We report the discovery of a unique quasar-dusty star-forming galaxy (DSFG) system at z = 5.63, consisting bright quasar J1133+1603 ( M UV − 27.42) and its compact, dust-obscured companion, J1133c. ALMA observations reveal prominent [C II ] bridge connecting DSFG, indicating ongoing interaction projected separation 1 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>.</mml:mi> </mml:mrow> <mml:mi>″</mml:mi>...
We report the discovery of a unique quasar-dusty star-forming galaxy (DSFG) system at $z = 5.63$, consisting bright quasar J1133+1603 ($M_{\rm UV} -27.42$) and its compact, dust-obscured companion, J1133c. ALMA observations reveal prominent [C II] bridge connecting DSFG, indicating ongoing interaction projected separation 1.8 arcsec ($\sim$10 proper kpc). J1133c exhibits unusually broad emission ($L_{\rm [CII]} > 10^{43}$ erg s$^{-1}$, FWHM $> 500$ km s$^{-1}$), with luminosity five times...
We report the discovery of a two-dimensional Galaxy Manifold within multi-dimensional luminosity space local galaxies. The is constructed using 11 bands that span from far ultraviolet to near-infrared for redshift < 0.1 galaxies observed with GALEX, SDSS, and UKIDSS. two latent parameters are sufficient express 93.2% variance in galaxy sample, suggesting this one most efficient representations transformation between luminosities manifold as an analytic mapping provided. representation...
Aiming at discriminating different gravitational potential models of the Milky Way, we perform tests based on kinematic data powered by Gaia DR2 astrometry, over a large range $(R,z)$ locations. Invoking complete form Jeans equations that admit three integrals motion, use independent $R$- and $z$-directional as two discriminators ($T_R$ $T_z$). We apply formula for spatial distributions radial vertical velocity dispersions proposed Binney et al., successfully extend it to azimuthal...