A5035796513- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Advanced Vision and Imaging
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- History and Developments in Astronomy
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
The University of Tokyo
2015-2018
Gravitational lensing by clusters of galaxies offers a powerful probe their structure and mass distribution. Deriving lens magnification map for galaxy cluster is classic inversion problem many methods have been developed over the past two decades to solve it. Several research groups techniques independently predominantly dark matter distribution in lenses. While these all provided remarkably high precision maps, particularly with exquisite imaging data from Hubble Space Telescope (HST),...
We present comprehensive analyses of faint dropout galaxies up to z ∼ 10 with the first full-depth data set A2744 lensing cluster and parallel fields observed by Hubble Frontier Fields (HFF) program. identify 54 dropouts at 5–10 in HFF enlarge size 9 galaxy sample obtained date. Although number highly magnified (μ 10) is small because tiny survey volume strong lensing, our study reaches galaxies' intrinsic luminosities comparable deepest-field HUDF studies. derive UV luminosity functions...
We construct $z\sim6-7$, 8, and 9 faint Lyman break galaxy samples (334, 61, 37 galaxies, respectively) with accurate size measurements the software $\texttt{glafic}$ from complete Hubble Frontier Fields (FF) cluster parallel fields data. These are largest hitherto reach down to ends of recently obtained deep luminosity functions. At magnitudes, however, these highly incomplete for galaxies large sizes, implying that derivation function (LF) sensitively depends on intrinsic size--luminosity...
We present UV luminosity functions of dropout galaxies at $z\sim6-10$ with the complete Hubble Frontier Fields data. obtain a catalog $\sim450$ dropout-galaxy candidates (350, 66, and 40 $z\sim6-7$, 8, 9, respectively), whose absolute magnitudes reach $\sim-14$ mag, $\sim2$ mag deeper than Ultra Deep Field detection limits. carefully evaluate number densities by Monte-Carlo simulations, including all lensing effects such as magnification, distortion, multiplication images well completeness...
ABSTRACT We present clustering analysis results from 10,381 Lyman break galaxies (LBGs) at z ∼ 4–7, identified in the Hubble legacy deep imaging and new complimentary large-area Subaru/Hyper Suprime-Cam data. measure angular correlation functions of these LBGs 4, 5, 6, 7 fit measurements using halo occupation distribution (HOD) models that provide an estimate masses, <?CDATA ${M}_{{\rm{h}}}\sim (1-20)\times {10}^{11}\;{M}_{\odot }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We conduct precise strong lensing mass modeling of four ${\it Hubble}$ Frontier Fields (HFF) clusters, Abell$~$2744, MACS$~$J0416.1$-$2403, MACS$~$J0717.5$+$3745, and MACS$~$J1149.6$+$2223, for which HFF imaging observations are completed. construct a refined sample more than 100 multiple images each cluster by taking advantage the full depth images, using ${\small \rm GLAFIC}$ software, assumes simply parametrized distributions. Our also exploits magnification constraint from lensed Type Ia...
We present statistics of 133 faint 1.2-mm continuum sources detected in about 120 deep ALMA pointing data that include all the archival available by 2015 June. derive number counts 1.2 mm down to 0.02 mJy partly with assistance gravitational lensing, and find total integrated flux securely identified is 22.9^(+6.7)_(-5.6) Jy deg^(-2) corresponds 104^(+31)_(-25) % extragalactic background light (EBL) measured COBE observations. These results suggest major EBL contributors are mJy, very ~<...
We investigate sizes of $z\sim6-8$ dropout galaxies using the complete data Abell 2744 cluster and parallel fields in Hubble Frontier Fields program. By directly fitting light profiles observed with lensing-distorted S\'ersic on image plane \texttt{glafic} software, we accurately measure intrinsic 31 $z\sim6-7$ eight $z\sim8$ galaxies, including those as faint $M_{\mathrm{UV}}\simeq-16.6$. find that half-light radii $r_\mathrm{e}$ positively correlates UV luminosity at each redshift,...
Supernova "Refsdal," multiply imaged by cluster MACSJ1149.5+2223, represents a rare opportunity to make true blind test of model predictions in extragalactic astronomy, on time scale that is short compared human lifetime. In order take advantage this event, we produced seven gravitational lens models with five independent methods, based Hubble Space Telescope (HST) Frontier Field images, along extensive spectroscopic follow-up observations HST, the Very Large and Keck Telescopes. We compare...