291 citations · 1.3k across the 11 of their papers we have counts for
12 papers
Calibration Method of the Monocular Omnidirectional Stereo Camera
Ryota Kawamata, Keiichi Betsui, Kazuyoshi Yamazaki +2
Compact and low-cost devices are needed for autonomous driving to image and measure distances to objects 360-degree around. We have been developing an omnidirectional stereo camera…
Prospects for observing strongly lensed supernovae behind Hubble Frontier Fields galaxy clusters with the James Webb Space Telescope
T. Petrushevska, T. Okamura, R. Kawamata +3
Measuring time delays from strongly lensed supernovae (SNe) is emerging as a novel and independent tool for estimating the Hubble constant . This is very important given the…
Size--luminosity relations and UV luminosity functions at simultaneously derived from the complete Hubble Frontier Fields data
Ryota Kawamata, Masafumi Ishigaki, Kazuhiro Shimasaku +3
We construct , 8, and 9 faint Lyman break galaxy samples (334, 61, and 37 galaxies, respectively) with accurate size measurements with the software from…
Angular momentum evolution of stellar disks at high redshifts
Taku Okamura, Kazuhiro Shimasaku, Ryota Kawamata
The stellar disk size of a galaxy depends on the ratio of the disk stellar mass to the halo mass, , and the fraction of the dark halo angular mom…
Two Peculiar Fast Transients in a Strongly Lensed Host Galaxy
S. A. Rodney, I. Balestra, M. Bradac +32
A massive galaxy cluster can serve as a magnifying glass for distant stellar populations, with strong gravitational lensing exposing details in the lensed background galaxies that…
Extreme magnification of a star at redshift 1.5 by a galaxy-cluster lens
Patrick L. Kelly, Jose M. Diego, Steven Rodney +42
Galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to ~50. Here we report an image of an individual star at redshift z=1.49 (dubbed "MACS J…
Full-Data Results of Hubble Frontier Fields: UV Luminosity Functions at and a Consistent Picture of Cosmic Reionization
Masafumi Ishigaki, Ryota Kawamata, Masami Ouchi +3
We present UV luminosity functions of dropout galaxies at with the complete Hubble Frontier Fields data. We obtain a catalog of dropout-galaxy candidates (350…
The Frontier Fields Lens Modeling Comparison Project
M. Meneghetti, P. Natarajan, D. Coe +20
Gravitational lensing by clusters of galaxies offers a powerful probe of their structure and mass distribution. Deriving a lens magnification map for a galaxy cluster is a classic…
Precise Strong Lensing Mass Modeling of Four Hubble Frontier Fields Clusters and a Sample of Magnified High-Redshift Galaxies
Ryota Kawamata, Masamune Oguri, Masafumi Ishigaki +2
We conduct precise strong lensing mass modeling of four Frontier Fields (HFF) clusters, Abell2744, MACSJ0416.12403, MACSJ0717.53745, and MACSJ1149.…
"Refsdal" meets Popper: comparing predictions of the re-appearance of the multiply imaged supernova behind MACSJ1149.5+2223
T. Treu, G. Brammer, J. M. Diego +25
Supernova "Refsdal," multiply imaged by cluster MACSJ1149.5+2223, represents a rare opportunity to make a true blind test of model predictions in extragalactic astronomy, on a time…
The sizes of lensed galaxies from the Hubble Frontier Fields Abell 2744 data
Ryota Kawamata, Masafumi Ishigaki, Kazuhiro Shimasaku +2
We investigate sizes of dropout galaxies using the complete data of the Abell 2744 cluster and parallel fields in the Hubble Frontier Fields program. By directly fitting…
Hubble Frontier Fields First Complete Cluster Data: Faint Galaxies at for UV Luminosity Functions and Cosmic Reionization
Masafumi Ishigaki, Ryota Kawamata, Masami Ouchi +3
We present the comprehensive analyses of faint dropout galaxies up to with the first full-depth data set of Abell 2744 lensing cluster and parallel fields observed by the…