A5100356592- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Laser Material Processing Techniques
- Advanced Fluorescence Microscopy Techniques
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Robotics and Automated Systems
- Photonic and Optical Devices
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Advanced Fiber Laser Technologies
- Advanced Vision and Imaging
Tsinghua University
2020-2024
National Astronomical Observatory of Japan
2024
The University of Tokyo
2018-2021
University of Toronto
2009
We investigate Lya, [OIII]5007, Ha, and [CII]158um emission from 1124 galaxies at z=4.9-7.0. Our sample is composed of 1092 Lya emitters (LAEs) z=4.9, 5.7, 6.6, 7.0 identified by Subaru/Hyper Suprime-Cam (HSC) narrowband surveys covered Spitzer large area survey with Subaru/HSC (SPLASH) 34 z=5.148-7.508 deep ALMA data in the literature. Fluxes strong rest-frame optical lines [OIII] Ha (Hb) are constrained significant excesses found SPLASH 3.6 4.5um photometry. At we find that equivalent...
Abstract In this paper, we present a Ly α halo (LAH) identified by stacking ∼3300 emitters (LAEs) at z = 2.2–2.3. We carry out imaging observations and data reduction with Subaru/Hyper Suprime-Cam. Our total survey area is ∼12 deg 2 the depths are 25.5–27.0 mag. Using data, select 1240 2101 LAE candidates 2.2 2.3, respectively. spectroscopic of our Magellan/IMACS to estimate contamination rate candidates. find that sample low (8%). stack median method identify LAH 2. show detected until ∼100...
Abstract Cosmic variance introduces significant uncertainties into galaxy number density properties when surveying the high-redshift Universe with a small volume. Such produce field-to-field σ g of numbers in observational astronomy, which significantly affects luminosity function (LF) measurement Ly α emitters (LAEs). For most previous LF studies, is often adopted from predictions by cosmological simulations, but barely confirmed observations. Measuring cosmic requires huge sample over...
Abstract We report the large scale structure and clustering analysis of Ly α emitters (LAEs) blobs (LABs) at z = 2.2–2.3. Using 3341 LAEs, 117 LABs, 58 bright (Ly luminosity L > 10 43.4 erg s −1 ) LABs 2.2–2.3 selected with Subaru/Hyper Suprime-Cam, we calculate LAE overdensity to investigate 2. show that 79% 83% are located in overdense regions, which is consistent trend found by previous studies generally regions. find one our eight fields, dubbed J1349, contains 39/117 ≈ 33% 22/58 38%...
Abstract We study a sample of 14 spectroscopically confirmed Ly α emitters (LAEs) in the late era reionization (at redshift z ≈ 6) based on JWST/NIRCam imaging data set. These LAEs with high luminosity L (Ly ) ∼10 42.4 –10 43.4 erg s −1 have been covered by (ongoing) COSMOS-Web survey over 0.28 deg 2 four NIRCam bands (F115W, F150W, F277W, and F444W). With imaging, we determine UV continua M ranging from −20.5 to −18.5 mag. The slopes median value β −2.35, steepest can reach < −3. Under...
Abstract We present the morphology and stellar population of 27 extremely metal-poor galaxies (EMPGs) at z ∼ 0 with metallicities 0.01–0.1 Z ⊙ . conduct multicomponent surface brightness (SB) profile fitting for deep Subaru/Hyper Suprime-Cam i -band images EMPGs Galfit software, carefully removing SB contributions tails. find that a median mass <?CDATA $\mathrm{log}({M}_{* }/{M}_{\odot })=6.0$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi>...
Abstract We conduct intensity mapping to probe for extended diffuse Ly α emission around emitters (LAEs) at z ∼2−7, exploiting very deep (∼26 mag 5 σ ) and large-area (∼4.5 deg 2 Subaru/Hyper Suprime-Cam narrowband (NB) images large LAE catalogs consisting of a total 1540 LAEs = 2.2, 3.3, 5.7, 6.6 obtained by the HSC-SSP CHORUS projects. calculate spatial correlations these with ∼1–2 billion pixel flux values NB images, deriving average surface brightness (SB radial profiles LAEs. By...
We present the Lyα luminosity function (LF) derived from 34 emitters (LAEs) at z = 7.0 on an area of sky 3.1 deg2, largest sample those in literature to date obtained a redshift ≳ 7. The LAE is compiled deep large-area narrowband observations with Subaru conducted by Cosmic HydrOgen Reionization Unveiled (CHORUS) project. LF our project consistent previous Dark Energy Camera and studies bright faint ends, respectively, while having uncertainties that are significantly smaller than study...
Abstract We present an IGM H i tomographic map in a survey volume of <?CDATA $16\times 19\times 131\ {h}^{-3}\ \mathrm{comoving}\ {\mathrm{Mpc}}^{3}$?> (cMpc 3 ) centered at MAMMOTH-1 nebula and three neighboring quasars z = 2.3. The is enormous Ly α (ELAN), hosted by type-II quasar dubbed MAMMOTH1-QSO, that extends over $1\ {h}^{-1}$?> cMpc with no clear physical origin. Here we investigate the -gas distribution around MAMMOTH1-QSO ELAN type-I quasars, making spatial resolution 2.6 h −1...
A modulated fiber laser provided burst-trains of femtosecond pulses to directly write linearly chirped Bragg grating waveguides inside bulk fused silica glass in a single process step. The results represent the first demonstration gratings embedded with an ultrafast laser. Simple exposure controls offer facile means for tuning spectral and dispersion responses three-dimensional optical circuits.
Abstract Circumgalactic Ly α nebulae are gaseous halos around galaxies exhibiting luminous extended emission. This work investigates from deep imaging of ∼12 deg 2 sky, targeted by the MAMMOTH-Subaru survey. Utilizing wide-field capability Hyper Suprime-Cam, we present one largest blind nebula selections, including QSO nebulae, blobs, and radio galaxy down to typical σ surface brightness <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo...
We report the Subaru Hyper Suprime-Cam (HSC) discovery of two Ly$\alpha$ blobs (LABs), dubbed z70-1 and z49-1 at $z=6.965$ $z=4.888$ respectively, that are emitters with a bright ($\log L_{\rm Ly\alpha}/{\rm [erg\ s^{-1}]}>43.4$) spatially-extended emission, present photometric spectroscopic properties total seven LABs; new LABs five previously-known $z=5.7-6.6$. The LAB shows extended emission scale length $1.4\pm 0.2$ kpc, about three times larger than UV continuum making most distant...
To determine the dominant sources for cosmic reionization, evolution history of global ionizing fraction, and topology ionized regions, we have conducted a deep imaging survey using four narrow-band (NB) one intermediate-band (IB) filters on Subaru/Hyper Suprime-Cam (HSC), called Cosmic HydrOgen Reionization Unveiled with Subaru (CHORUS). The central wavelengths full-widths-at-half-maximum CHORUS are, respectively, 386.2 nm 5.5 NB387, 526.0 7.9 NB527, 717.1 11.1 NB718, 946.2 33.0 IB945,...
In this paper, we present a Ly$\alpha$ halo extended to $\sim200$ kpc identified by stacking $\sim 3300$ emitters at $z=2.2-2.3$. We carry out imaging observations and data reduction with Subaru/Hyper Suprime-Cam (HSC). Our total survey area is $\sim12$ deg$^2$ depths are $25.5-27.0$ mag. Using the data, select 1,240 2,101 LAE candidates $z=2.2$ 2.3, respectively. spectroscopic of our Magellan/IMACS estimate contamination rate candidates. find that sample low (8%). stack median method...
We report the identification of a quasar overdensity in BOSSJ0210 field, dubbed Cosmic Himalayas, consisting 11 quasars at $z=2.16-2.20$, densest ($17\sigma$) $\sim$10,000 deg$^2$ Sloan Digital Sky Survey. present spatial distributions galaxies and an HI absorption map intergalactic medium (IGM). On 465 selected from MAMMOTH-Subaru survey, we find two galaxy density peaks that do not fall on but instead exist northwest southeast sides, approximately 25 $h^{-1}$ comoving-Mpc apart...
Circumgalactic Lyman-alpha (Ly$\alpha$) nebulae are gaseous halos around galaxies exhibiting luminous extended Ly$\alpha$ emission. This work investigates from deep imaging of $\sim12~\mathrm{deg}^2$ sky, targeted by the MAMMOTH-Subaru survey. Utilizing wide-field capability Hyper Suprime-Cam (HSC), we present one largest blind nebula selections, including QSO nebulae, blobs, and radio galaxy down to typical $2\sigma$ surface brightness...
We report the large scale structure and clustering analysis of Ly$\alpha$ emitters (LAEs) blobs (LABs) at $z=2.2-2.3$. Using 3,341 LAEs, 117 LABs, 58 bright (Ly$\alpha$ luminosity $L_{\rm Ly\alpha}>10^{43.4}$ erg s$^{-1}$) LABs $z=2.2-2.3$ selected with Subaru/Hyper Suprime-Cam (HSC), we calculate LAE overdensity to investigate $z=2$. show that 74% 78% locate in overdense regions, which is consistent trend found by previous studies generally regions. find one our 8 fields dubbed J1349...
Cosmic variance introduces significant uncertainties into galaxy number density properties when surveying the high-z Universe with a small volume, such produce field-to-field of $\sigma_{g}$ in observational astronomy. This uncertainty significantly affects Luminosity Functions (LF) measurement Lya Emitters (LAEs). For most previous LF studies, is often adopted from predictions by cosmological simulations, but barely confirmed observations. Measuring cosmic requires huge sample over large...
We study a sample of 14 spectroscopically confirmed Ly$\alpha$ Emitters (LAEs) in the late era reionization (at redshift $z\approx6$) based on JWST/NIRCam imaging dataset. These LAEs with high luminosity $L$(Ly$\alpha$) $\sim10^{42.4-43.4}$ erg s$^{-1}$ have been covered by (ongoing) COSMOS-Web survey (Kartaltepe et al. 2021; Casey 2022) over $0.28$ deg$^2$ four NIRCam bands (F115W, F150W, F277W, and F444W). With JWST imaging, we determine UV continua $M_{\rm UV}$ ranging from ${-}20.5$ to...