A5054484999- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Astro and Planetary Science
- Optical Systems and Laser Technology
- Pulsars and Gravitational Waves Research
- Advanced optical system design
- Dark Matter and Cosmic Phenomena
- Advanced Semiconductor Detectors and Materials
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Optical Wireless Communication Technologies
- Photocathodes and Microchannel Plates
- Planetary Science and Exploration
- Remote-Sensing Image Classification
National Astronomical Observatory of Japan
2013-2023
The Graduate University for Advanced Studies, SOKENDAI
2016-2023
Subaru (Japan)
2005-2021
Saint Mary's University
2019-2021
National Institutes of Natural Sciences
2011-2017
Astronomical Observatory
1999-2007
Kyoto University
1997-2007
Toyama Science Museum
1999
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of 8.2m Subaru telescope summit Maunakea in Hawaii. A team scientists from Japan, Taiwan and Princeton University using HSC to carry out 300-night multi-band survey high-latitude sky. The includes three layers: Wide layer will cover 1400 deg$^2$ five broad bands ($grizy$), with $5\,\sigma$ point-source depth $r \approx 26$. Deep covers total 26~deg$^2$ four fields, going roughly magnitude fainter, while UltraDeep goes...
This paper presents the second data release of Hyper Suprime-Cam Subaru Strategic Program, a wide-field optical imaging survey on 8.2 meter Telescope. The includes from 174 nights observation through January 2018. Wide layer cover about 300 deg^2 in all five broadband filters (grizy) to nominal exposure (10min gr and 20min izy). Partially observed areas are also included release; 1100 is at least one filter exposure. median seeing i-band 0.6 arcsec, demonstrating superb image quality survey....
We present an updated version of the so-called Madau model for attenuation radiation from distant objects by intergalactic neutral hydrogen. First, we derive distribution function absorbers latest observational statistics Lyα forest, Lyman-limit systems and damped systems. The reproduces observed redshift evolution depression mean-free path Lyman continuum excellently simultaneously. then a set analytic functions describing mean curve at z > 0.5. new predicts less (or more) ≃ 3–5 (z 6)...
The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most outstanding questions in astronomy today, including nature dark matter and energy. has been awarded 300 nights observing time Telescope it started March 2014. This paper presents first public data release HSC-SSP. includes taken 1.7 years observations (61.5 nights) each Wide, Deep, UltraDeep layers covers about 108, 26, 4 square degrees down to depths i~26.4, ~26.5,...
Abstract This paper presents the third data release of Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP), a wide-field multi-band imaging survey with 8.2 m telescope. HSC-SSP has three layers (Wide, Deep, and UltraDeep) different area coverages depths, designed to address wide array astrophysical questions. from includes 278 nights observing time covers about 670 deg2 in all five broad-band filters (grizy) at full depth (∼26 mag 5σ depending on filter) Wide layer. If we include partially...
Abstract We have developed an automated quick data analysis system for quality assurance (QA) Hyper Suprime-Cam (HSC). The was commissioned in 2012–2014, and has been offered general observations, including the HSC Subaru Strategic Program, since 2014 March. provides observers with information, such as seeing, sky background level, transparency, based on are acquired. Quick-look images validation of image focus also provided through interactive web application. is responsible automatic...
We present multi-wave band optical imaging data obtained from observations of the Subaru/XMM-Newton Deep Survey (SXDS). The survey field, centered at R .A . = 02h18m00s, decl − 05°00'00'', has been focus a wide range multiwavelength observing programs spanning X-ray to radio wavelengths. A large part are carried out with Suprime-Cam on Subaru Telescope Mauna Kea in course "Observatory Projects." This paper describes our observations, reduction and analysis procedures employed,...
Knowing the amount of ionizing photons from young star-forming galaxies is particular importance to understanding reionization process. Here we report initial results Subaru/Suprime-Cam deep imaging observation SSA22 proto-cluster region at z=3.09, using a special narrow-band filter optimally trace Lyman continuum (LyC) z~3. The unique wide field-of-view Suprime-Cam enabled us search for 198 (73 break (LBGs) and 125 Ly-alpha emitters (LAEs)) with spectroscopically measured redshifts z~3.1....
We discuss the rest-frame ultraviolet emission line spectra of a large (~100) sample low luminosity redshift z~3.1 Lyman alpha emitters (LAEs) drawn from Subaru imaging survey in SSA22 field. Our earlier work based on smaller samples indicated that such sources have high [OIII]/[OII] ratios possibly arising hard ionising spectrum may be typical similar reionisation era. With optical secured VLT/VIMOS, we re-examine nature radiation larger using strength ionisation diagnostic lines CIII]1909,...
The CFHT Large Area U-band Deep Survey (CLAUDS) uses data taken with the MegaCam mosaic imager on to produce images of 18.60 deg2 median seeing FWHM=0.92 arcsec and a depth U = 27.1 AB (5 sigma in 2 apertures), selected areas that total 1.36 reaching U=27.7 AB. These are deepest assembled date over this large an area. located four fields also imaged comparably faint levels grizy several narrowband filters as part Hyper Suprime-Cam (HSC) Subaru Strategic Program (HSC-SSP). datasets will...
We present Keck/MOSFIRE spectra of the diagnostic nebular emission lines [OIII]5007,4959, [OII]3727, and H-beta for a sample 15 redshift z=3.1-3.7 Ly-alpha emitters (LAEs) Lyman break galaxies (LBGs). In conjunction with from other surveys, we confirm earlier indications that LAEs have much higher [OIII]/[OII] line ratio than is seen in similar LBGs. By comparing their distributions on versus R23 diagram, demonstrate this difference cannot arise solely because lower metallicities but most...
We report a deficiency of luminous Lyman break galaxies (LBGs) with large rest-frame equivalent width (EWrest) Lyα emission at z ~ 5-6. Combining our spectroscopic sample LBGs 5 and those from the literature, we found that 5-6 generally show weak emissions, while faint wide range EWrest tend to have strong (EWrest ≳ 20 Å) emissions; i.e., there is in LBGs. There seems be threshold UV luminosity for deficiency; it M1400 = -21.5 -21.0 mag, which close or somewhat brighter than M* function 6....
We use very deep near-infrared (NIR) imaging data obtained in MOIRCS Deep Survey (MODS) to investigate the evolution of galaxy stellar mass function back z ∼ 3. The MODS reach J = 24.2, H 23.1, and K 23.1 (5σ, Vega magnitude) over 103 arcmin2 (wide) 25.1, 23.7, 24.1 28 (deep) GOODS-North region. wide NIR allow us measure number density galaxies down low (109–1010 M☉) even at high redshift with statistical accuracy. normalization decreases redshift, integrated becomes ∼8%–18% local value 2...
We have made a Monte Carlo simulation of the intergalactic absorption in order to model Lyman continuum absorption, which is required estimate escape fraction from distant galaxies. To input into simulation, we derive an empirical distribution function absorbers reproduces recent observational statistics $α$ forest, limit systems (LLSs), and damped (DLAs) simultaneously. In particular, assume common functional form number evolution along redshift for all types absorbers. The series...
We present the results of spectral energy distribution (SED) fitting analysis for Lyman break galaxies (LBGs) at z ∼ 5 in Great Observatories Origins Deep Survey North (GOODS-N) and its flanking fields (the GOODS-FF). With publicly available Infrared Array Camera (IRAC) images GOODS-N IRAC data GOODS-FF, we constructed rest-frame UV to optical SEDs a large sample (∼100) UV-selected 5. Comparing observed with model generated population synthesis code, derived best-fit set parameters (stellar...
The escape fraction of ionizing photons from galaxies is a crucial quantity controlling the cosmic background radiation and reionization. Various estimates this parameter can be obtained in redshift range, z=0--6, either direct observations or observed intensities. We compare them homogeneously terms flux density ratio ($\sim900$ Årest-frame) to non-ionizing ultraviolet ($\sim1500$ corrected for intergalactic absorption. found increase by an order magnitude, value less than 0.01 at $z\la1$...
(abridged) We report the UV luminosity function (LF) of Lyman break galaxies at z~5 derived from a deep and wide survey using Subaru/Suprime-Cam. Target fields consist two blank regions sky (the HDF-N J0053+1234), total effective surveyed area is 1290 sqarcmin. Applications carefully determined colour selection criteria in V-I I-z' yield detection 853 candidates with z'AB<26.5 mag. The UVLF shows no significant change number density bright (L>=L*_z=3) LBGs that z~3, while there decline...
We present deep J-, H-, and Ks-band imaging data of the MOIRCS Deep Survey (MODS), which was carried out with Multi-Object Infrared Camera Spectrograph (MOIRCS) mounted on Subaru telescope in GOODS-North region. The reach 5sigma total limiting magnitudes for point sources J=23.9, H=22.8, Ks=22.8 (Vega magnitude) over 103 arcmin^2 (wide field). In 28 survey area, is ultra field MODS (deep field), depths J=24.8, H=23.4, Ks=23.8. spatial resolutions combined images are FWHM ~ 0.6 arcsec 0.5...
(abridged) We present results of a search for Lyman break galaxies (LBGs) at z ~ 5 in 618 square-arcmin field including the HDF-N taken by Subaru Prime Focus Camera. Utilizing published redshift data and its flanking fields, color selection criteria are chosen so that LBGs picked out most efficiently least contaminated foreground objects. The numbers LBG candidates detected 310 23.0 < I_c 25.5. rest-frame UV luminosity function(LF) is derived statistically. fraction contamination estimated...
We have performed narrow-band imaging observations with the Very Large Telescope, aimed at detecting Lyman continuum (LC) flux escaping from galaxies . do not find any significant LC our sample of two in Hubble Deep Field South, and 3.275. The corresponding lower limits on density (per Hz) ratio are 15.6 10.2 (3-σ confidence level). After correction for intergalactic hydrogen absorption, resulting relative escape fraction compared those obtained by different approaches, similar or redshifts....
We present the results of a narrow-band (H2S1, 2.121/0.021um) imaging search with WFCAM/UKIRT for H-alpha emitters around several potential signposts rare (10^-7-10^-8 Mpc^-3) over-dense regions at z=2.23: an over-density QSOs (2QZ cluster), powerful, high-redshift radio galaxy (HzRG), and concentration submillimetre galaxies (SMGs) optically faint (OFRGs). In total, we detect 137 emitter candidates down to emission-line fluxes 0.5-1 x 10^-16 erg s^-1 cm^-2, across total area 0.56 sq....
Subaru/SuprimeCam narrowband photometry of the SSA22 field reveals presence four Lyman continuum (LyC) candidates among a sample 14 AGN. Two show offsets and likely have stellar LyC in nature or are foreground contaminants. The remaining two Type I We argue that average escape fraction high redshift low luminosity AGN is not to be unity, as often assumed literature. From direct measurement we obtain LyC-to-UV flux density ratio ionizing emissivity for number classes find it at least factor...
Abstract The Kiso Supernova Survey (KISS) is a high-cadence optical wide-field supernova (SN) survey. primary goal of the survey to catch very early light SN, during shock breakout phase. Detection SN breakouts combined with multi-band photometry obtained other facilities would provide detailed physical information on progenitor stars SNe. performed using 2 $_{.}^{\circ}$2 × field-of-view instrument 1.05-m Schmidt telescope, Wide Field Camera (KWFC). We take 3-min exposure in g-band once...
Deep narrowband (NB359) imaging with Subaru telescope by Iwata et al. have detected surprisingly strong Lyman continuum (LyC; ∼ 900 Å in the rest-frame) from some α emitters (LAEs) at z = 3.1.However, a possibility of redshift misidentification was not rejected previous spectroscopy due to narrow wavelength coverage.We here present results new deep covering observed 4,000-7,000 VLT/VIMOS and Subaru/FOCAS 8 LAEs NB359.All eight objects only one detectable emission line around 4,970 which is...
We present the largest to date sample of hydrogen Lyman continuum (LyC) emitting galaxy candidates at any redshift, with 18 Ly$\alpha$ Emitters (LAEs) and 7 Break Galaxies (LBGs), obtained from SSA22 field Subaru/Suprime-Cam. The is based on 159 LAEs 136 LBGs observed in field, all spectroscopically confirmed redshifts, these LyC are selected as galaxies counterpart a narrow-band filter image which traces $z\geq 3.06$. Many show spatial offset between rest-frame non-ionizing ultraviolet (UV)...