A5007159709- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Pulsars and Gravitational Waves Research
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- Microwave Engineering and Waveguides
- Cosmology and Gravitation Theories
- Photocathodes and Microchannel Plates
- Calibration and Measurement Techniques
- Optical Systems and Laser Technology
- Advanced Measurement and Metrology Techniques
- Phase Equilibria and Thermodynamics
- Space Exploration and Technology
The University of Tokyo
2011-2025
National Astronomical Observatory of Japan
2010-2024
The Graduate University for Advanced Studies, SOKENDAI
2024
National Institutes of Natural Sciences
2016-2024
Kyoto University
2011-2013
Misato Observatory
2010-2011
Institute of Astronomy
2006-2011
The physical properties and elemental abundances of the interstellar medium in galaxies during cosmic reionization are important for understanding role this process. We report Atacama Large Millimeter/submillimeter Array detection an oxygen emission line at a wavelength 88 micrometers from galaxy epoch about 700 million years after Big Bang. abundance is estimated one-tenth that Sun. nondetection far-infrared continuum indicates deficiency dust galaxy. A carbon 158 also not detected,...
We report the source size distribution, as measured by ALMA millimetric continuum imaging, of a sample 13 AzTEC-selected submillimeter galaxies (SMGs) at –6. Their infrared luminosities and star formation rates (SFRs) are 2– ∼200–600 yr−1, respectively. The sizes these SMGs range from 010 to 038, with median 020 (FWHM), corresponding circularized effective radius () kpc, comparable typical stellar component in compact quiescent (cQGs)— kpc. surface SFR density our is yr−1 kpc−2, that seen...
We report on the detection of [CII] 157.7 $\mu$m emission from Lyman break galaxy (LBG) MACS0416_Y1 at z = 8.3113, by using Atacama Large Millimeter/submillimeter Array (ALMA). The luminosity ratio [OIII] 88 (from previous campaigns) to is 9.31 $\pm$ 2.6, indicative hard interstellar radiation fields and/or a low covering fraction photo-dissociation regions. cospatial 850 dust (90 rest-frame, campaigns), however peak does not agree with emission, suggesting that lines originate different...
We present < 1 kpc resolution CO imaging study of 37 optically-selected local merger remnants using new and archival interferometric maps obtained with ALMA, CARMA, SMA PdBI. supplement a sub-sample single-dish measurements at the NRO 45 m telescope for estimating molecular gas mass (10^7 - 10^11 M_sun), evaluating missing flux measurements. Among sources robust detections, we find that 80 % (24/30) sample show kinematical signatures rotating disks (including nuclear rings) in their velocity...
We report the results of 15 × 3' mapping at 1.1 mm with Atacama Large Millimeter/submillimeter Array toward central region z = 3.09 SSA22 protocluster. By combining our source catalog archival spectroscopic redshifts, we find that eight submillimeter galaxies (SMGs) flux densities, S1.1 0.7–6.4 mJy (LIR ∼ 1012.1–1013.1 L⊙) are 3.08–3.10. Not only these SMGs members protocluster, but they in fact reside within node junction 50 Mpc scale filamentary three-dimensional structure traced by Lyα...
We present ALMA observations of the [C ii] line and far-infrared (FIR) continuum a normally star-forming galaxy in reionization epoch, z = 6.96 Lyα emitter (LAE) IOK-1. Probing to sensitivities σline 240 μJy beam−1 (40 km s−1 channel) σcont 21 beam−1, we found undetected both continuum. Comparison ultraviolet (UV)–FIR spectral energy distribution (SED) IOK-1, including our limit, with those several types local galaxies (including effects cosmic microwave background, CMB, on FIR continuum)...
We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations the z = 3.042 gravitationally lensed submillimeter galaxy HATLAS J090311.6+003906 (SDP.81). These were carried out using a extended configuration as part Science Verification for 2014 ALMA Long Baseline Campaign, with baselines up to ∼15 km. continuum imaging at 151, 236, and 290 GHz unprecedented angular resolutions fine 23 mas, corresponding an unmagnified spatial scale ∼180...
We have obtained three-dimensional maps of the universe in $\sim200\times200\times80$ comoving Mpc$^3$ (cMpc$^3$) volumes each at $z=5.7$ and $6.6$ based on a spectroscopic sample 179 galaxies that achieves $\gtrsim80$\% completeness down to Ly$\alpha$ luminosity $\log(L_{\rm Ly\alpha}/[\mathrm{erg\ s^{-1}}])=43.0$, our Keck Gemini observations literature. The reveal filamentary large-scale structures two remarkable overdensities made out least 44 12 $z=5.692$ (z57OD) $z=6.585$ (z66OD),...
Abstract We present the Atacama Large Millimeter/submillimeter Array detection of [O iii ] 88 μ m line and rest-frame 90 dust continuum emission in a Y -dropout Lyman break galaxy (LBG), MACS0416_Y1 lying behind Frontier Field cluster MACS J0416.1−2403. This confirms LBG with spectroscopic redshift z = 8.3118 ± 0.0003, making this object one farthest galaxies ever identified spectroscopically. The observed 850 flux density 137 26 Jy corresponds to de-lensed total infrared (IR) luminosity...
We present a set of multi-wavelength mosaics and photometric catalogs in the ALMA lensing cluster survey (ALCS) fields. The were built by reprocessing archival data from CHArGE compilation, taken $\textit{Hubble Space Telescope}$ ($\textit{HST}$) RELICS, CLASH Hubble Frontier Fields. Additionally we have reconstructed $\textit{Spitzer}$ IRAC 3.6 4.5 $\mu$m mosaics, utilising all available IRSA/SHA exposures. To alleviate effect blending such crowded region, modelled photometry convolving...
Abstract We present a joint analysis of the galaxy S04590 at z = 8.496 based on NIRSpec, NIRCam, and NIRISS observations obtained as part Early Release Observations program James Webb Space Telescope (JWST) far-infrared [C ii ] 158 μ m emission line detected by dedicated Atacama Large Millimeter/submillimeter Array (ALMA) observations. determine physical properties from modeling spectral energy distribution (SED) through redshifted optical nebular lines with JWST/NIRSpec. The best-fit SED...
Abstract We present Atacama Large Millimeter/submillimeter Array (ALMA) deep spectroscopy for a lensed galaxy at z spec = 8.496 with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mi>star</mml:mi> </mml:msub> stretchy="true">/</mml:mo> <mml:mo>⊙</mml:mo> stretchy="false">)</mml:mo> <mml:mo>∼</mml:mo> <mml:mn>7.8</mml:mn> </mml:math> whose optical...
We present a 0.72 deg2 contiguous 1.1-mm survey in the central area of Cosmological Evolution Survey field carried out to 1σ≈ 1.26 mJy beam−1 depth with AzTEC camera mounted on 10-m Atacama Submillimeter Telescope Experiment. have uncovered 189 candidate sources at signal-to-noise ratio (S/N) ≥ 3.5, which 129, S/N 4, can be considered little chance being spurious (≲2 per cent). number counts derived this survey, show significant excess when compared from ∼0.5 sampled similar depths...
We report the results of counterpart identification and a detailed analysis physical properties 48 sources discovered in our deep 1.1mm wavelength imaging survey GOODS-South field using AzTEC instrument on Atacama Submillimeter Telescope Experiment (ASTE). One or more robust tentative candidate is found for 27 14 sources, respectively, by employing radio continuum, Spitzer MIPS & IRAC, LABOCA 870 micron data. Five (10%) have two counterparts each, supporting idea that these galaxies are...
We present the first results from a confusion-limited map of Great Observatories Origins Deep Survey-South (GOODS-S) taken with AzTEC camera on Atacama Submillimeter Telescope Experiment. imaged field to 1σ depth 0.48–0.73 mJy beam−1, making this one deepest blank-field surveys at mm-wavelengths ever achieved. Although by traditional standards our GOODS-S is extremely confused due sea faint underlying sources, we demonstrate through simulations that source identification and number counts...
We present 0".2-resolution Atacama Large Millimeter/submillimeter Array observations at 870 um for 25 Halpha-seleced star-forming galaxies (SFGs) around the main-sequence z=2.2-2.5. detect significant continuum emission in 16 (64%) of these SFGs. The high-resolution maps reveal that dust is mostly radiated from a single region close to galaxy center. Exploiting visibility data taken over wide $uv$ distance range, we measure half-light radii rest-frame far-infrared best sample 12 massive with...
We present spatially resolved ALMA observations of the CO J=3-2 emission line in two massive galaxies at z=2.5 on star-forming main sequence. Both have compact dusty cores with effective radii Re=1.3 kpc and Re=1.2 870 um continuum emission. The spatial extent molecular gas is also Re=1.9 Re=2.3 kpc, but more extended than dust Interpreting observed position-velocity diagrams dynamical models, we find starburst to be rotation-dominated ratio maximum rotation velocity local dispersion...
We present results from a deep 2'x3' (comoving scale of 3.7 Mpc x 5.5 at z=3) survey 1.1 mm taken with the Atacama Large Millimeter/submillimeter Array (ALMA) in SSA22 field. observe core region z = 3.09 protocluster, achieving typical rms sensitivity 60 micro-Jy/beam spatial resolution 0".7. detect 18 robust ALMA sources signal-to-noise ratio (SNR) > 5. Comparison between map and AzTEC camera on Submillimeter Telescope Experiment (ASTE) indicates that three submillimeter discovered by...
We present the faint end of number counts at 1.3 mm (238 GHz) obtained with Atacama Large Millimeter/submillimeter Array (ALMA). Band 6 observations were carried out targeting 20 star-forming galaxies z ∼ 1.4 in Subaru/XMM-Newton Deep Survey field. In observations, we serendipitously detect 15 sources (⩾3.8σ, S1.3 = 0.15–0.61 mJy) other than targeted sources. create by using these "sub-mJy sources," which probe faintest flux range among surveys millimeter wavelengths. The are consistent...
ABSTRACT Compiling data from literature and the Atacama Large Millimeter/submillimeter Array archive, we show enhanced HCN(4–3)/HCO + (4–3) and/or HCN(4–3)/CS(7–6) integrated intensity ratios in circumnuclear molecular gas around active galactic nuclei (AGNs) compared to those starburst (SB) galaxies (submillimeter HCN enhancement). The number of sample is significantly increased our previous work. We expect that this feature could potentially be an extinction-free energy diagnostic tool...
Abstract We report detections of two 1.2 mm continuum sources ( S ∼ 0.6 mJy) without any counterparts in the deep H - and/or K -band image (i.e., magnitude ≳26 mag). These near-infrared-dark faint millimeter are uncovered by ASAGAO, a and wide-field (≃26 arcmin 2 ) Atacama Large Millimeter/submillimeter Array (ALMA) survey. One has red IRAC (3.6 4.5 μ m) counterpart, other been independently detected at 850 870 m using SCUBA2 ALMA Band 7, respectively. Their optical-to-radio spectral energy...
Glowing filaments of the cosmic web Most gas in Universe lies intergalactic medium, where it forms into sheets and web. Clusters galaxies form at intersection these filaments, fed by pulled along them gravity. Although this picture is well established cosmological simulations, has been difficult to demonstrate observationally. Umehata et al. mapped emission from medium an area around that are starting a cluster (see Perspective Hamden). They found arranged whose position velocity correlate...