A5057625818- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- SAS software applications and methods
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Particle Detector Development and Performance
- Optical Systems and Laser Technology
- GNSS positioning and interference
- Advanced optical system design
- Cosmology and Gravitation Theories
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Black Holes and Theoretical Physics
- Infrared Target Detection Methodologies
- Antenna Design and Optimization
- Spacecraft Design and Technology
- CCD and CMOS Imaging Sensors
National Astronomical Research Institute of Thailand
2017-2024
Chulalongkorn University
2015-2024
Kavli Institute for the Physics and Mathematics of the Universe
2014-2023
The University of Tokyo
2014-2023
University of Arizona
2007-2022
Planetary Science Institute
2015
University of California, Santa Barbara
2009
Kitt Peak National Observatory
2008
University of Michigan–Ann Arbor
2005-2007
University of Hawaiʻi at Mānoa
2005
We present the results of first, deep Atacama Large Millimeter Array (ALMA) imaging covering full ≃4.5 arcmin2 Hubble Ultra Deep Field (HUDF) imaged with Wide Camera 3/IR on HST. Using a 45-pointing mosaic, we have obtained homogeneous 1.3-mm image reaching σ1.3 ≃ 35 μJy, at resolution ≃0.7 arcsec. From an initial list ≃50 > 3.5σ peaks, rigorous analysis confirms 16 sources S1.3 120 μJy. All these secure galaxy counterparts robust redshifts (〈z〉 = 2.15). Due to unparalleled supporting data,...
We present a 69 arcmin$^2$ ALMA survey at 1.1mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of GOODS-South field. taper 0"24 original image with homogeneous and circular synthesized beam 0"60 to reduce number independent beams - thus reducing purely statistical spurious detections optimize sensitivity point sources. extract catalogue galaxies selected by identify sources without HST counterparts down 5$\sigma$ limiting depth H=28.2 AB (HST/WFC3 F160W). detects 20 brighter than 0.7...
We present ALMA Band 9 observations of the [C II]158um emission for a sample 10 main-sequence galaxies at redshift z ~ 2, with typical stellar masses (log M*/Msun 10.0 - 10.9) and star formation rates (~ 35 115 Msun/yr). Given strong well understood evolution interstellar medium from to = we investigate behaviour II] empirically identify its primary driver. detect six (four secure, two tentative) estimate ensemble averages including non detections. The II]-to-infrared luminosity ratio (L[C...
We use high-resolution continuum images obtained at 870microns with the Atacama Large Millimeter Array (ALMA) to probe surface density of star-formation in z~2 galaxies and study different physical properties between within above main sequence galaxies. This sample eight star-forming selected among most massive Herschel GOODS-South field is supplemented eleven from public data 1.3 mm survey Hubble Ultra-Deep Field. ALMA reveals systematically dense concentrations dusty close center stellar...
We present 12 new AGN at 4<z<7 in the JADES survey (in addition to previously identified GN-z11 z=10.6) revealed through detection of a Broad Line Region as seen Halpha. The depth JADES, together with use three different spectral resolutions, enables us probe lower mass regime relative previous studies. In few cases we find evidence for two broad components Halpha which suggests that these could be candidate merging black holes (BHs). inferred BH masses range between 8 x 10^7 Msun down 4...
Spectroscopy with the James Webb Space Telescope has opened possibility of identifying moderate-luminosity active galactic nuclei (AGNs) in early Universe, at and beyond epoch re-ionisation, complementing previous surveys much more luminous (and rarer) quasars. We present 12 new AGNs 4 < z 7 JADES survey (in addition to previously identified AGN GN-z11 = 10.6) revealed through detection a broad-line region (BLR) seen Balmer emission lines. The depth JADES, together use three different...
Abstract We study 31 little red dots (LRD) detected by JADES/NIRCam and covered the SMILES/MIRI survey, of which ∼70% are in two bluest MIRI bands 40% redder filters. The median/quartiles redshifts <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>z</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>6.9</mml:mn> </mml:mrow> <mml:mn>5.9</mml:mn> <mml:mn>7.7</mml:mn> </mml:msubsup> </mml:math> (55% spectroscopic). spectral slopes flatten rest-frame...
Abstract Using deep JWST imaging from JADES, JEMS, and SMILES, we characterize optically faint extremely red galaxies at z > 3 that were previously missing galaxy census estimates. The data indicate the existence of abundant, dusty, poststarburst-like down to 10 8 M ⊙ , below sensitivity limit Spitzer Atacama Large Millimeter/submillimeter Array (ALMA). Modeling NIRCam Hubble Space Telescope (HST) photometry these sources can result in high values for both stellar mass star formation rate...
Abstract Understanding the coevolution of supermassive black holes and their host systems requires a comprehensive census active galactic nuclei (AGNs) behavior across wide range redshift, luminosity, obscuration level, galaxy properties. We report significant progress with JWST toward this goal from Systematic Mid-infrared Instrument Legacy Extragalactic Survey (SMILES). Based on spectral energy distribution (SED) analysis 3273 MIRI-detected sources, we identify 217 AGN candidates over...
Abstract HDF850.1 is the brightest submillimeter galaxy (SMG) in Hubble Deep Field. It known as a heavily dust-obscured star-forming embedded an overdense environment at z = 5.18. With nine-band NIRCam images 0.8–5.0 μ m obtained through JWST Advanced Extragalactic Survey, we detect and resolve rest-frame UV–optical counterpart of HDF850.1, which splits into two components because heavy dust obscuration center. The southern component leaks UV H α photons, bringing ∼100 times above empirical...
ABSTRACT We present ≃0.″4 resolution extinction-independent distributions of star formation and dust in 11 star-forming galaxies (SFGs) at z = 1.3–3.0. These are selected from sensitive blank-field surveys the 2′ × Hubble Ultra-Deep Field λ 5 cm 1.3 mm using Karl G. Jansky Very Large Array Atacama Millimeter/submillimeter Array. They have rates (SFRs), stellar masses, properties representative massive main-sequence SFGs ∼ 2. Morphological classification performed on spatially resolved mass...
We present the results of a new study relationship between infrared excess (IRX), UV spectral slope (beta) and stellar mass at redshifts 2<z<3, based on deep Atacama Large Millimeter Array (ALMA) 1.3-mm continuum mosaic Hubble Ultra Deep Field (HUDF). Excluding most heavily-obscured sources, we use stacking analysis to show that z~2.5 star-forming galaxies in range 9.25 <= log(M/Msun) 10.75 are fully consistent with IRX-beta relation expected for relatively grey attenuation curve, similar...
Local starbursts have a higher efficiency of converting gas into stars, as compared to typical star-forming galaxies at given stellar mass, possibly indicative different modes star formation. With the peak epoch galaxy formation occurring z > 1, it remains be established whether such an efficient mode is high redshift. To address this issue, we measure molecular content seven high-redshift (z ∼ 1.6) starburst with Atacama Large Millimeter/submillimeter Array and IRAM/Plateau de Bure...
Submillimeter/millimeter observations of dusty star-forming galaxies with the Atacama Large Millimeter/submillimeter Array (ALMA) have shown that dust continuum emission generally occurs in compact regions smaller than stellar distribution. However, it remains to be understood how systematic these findings are. Studies often lack homogeneity sample selection, target discontinuous areas inhomogeneous sensitivities, and suffer from modest u v coverage coming single array configurations....
Our current understanding of the cosmic star formation history at z>3 is primarily based on UV-selected galaxies (i.e., LBGs). Recent studies H-dropouts have revealed that we may be missing a large proportion taking place in massive z>3. In this work, extend H-dropout criterion to lower masses select optically dark/faint (OFGs), order complete census between LBGs and H-dropouts. (H> 26.5 mag & [4.5] < 25 mag) combined with de-blending technique designed not only extremely dust-obscured but...
We present an identification of dust-attenuated star-forming galactic-disk substructures in a typical galaxy (SFG), UDF2, at $z = 2.696$. To date, containing significant buildup stellar mass and actively forming stars have yet to be found (i.e., main-sequence) SFGs > 2$. This is due the strong dust attenuation common massive galaxies epoch scarcity high-resolution, high-sensitivity extinction-independent imaging. search for disk substructures, we subtracted central stellar-mass from...
We show that the star-forming regions in high-redshift luminous and ultraluminous infrared galaxies (LIRGs ULIRGs) submillimeter (SMGs) have similar physical scales to those local normal galaxies. To first order, their higher (IR) luminosities result from luminosity surface density. also find a good correlation between IR density starburst across over five orders of magnitude z ~ 2 SMGs. The intensely ULIRGs are significantly smaller than counterparts hence diverge this correlation,...
We report on a complete set of early optical afterglows gamma-ray bursts (GRBs) obtained with the Robotic Optical Transient Search Experiment (ROTSE-III) telescope network from 2005 March through 2007 June. This is comprised 12 and Swift/X-Ray Telescope observations, median ROTSE-III response time 45 s after start γ-ray emission (8 GCN notice time). These span 4 orders magnitude in luminosity, contemporaneous X-ray detections allow multi-wavelength spectral analysis. Excluding flares,...
The final assembly of terrestrial planets occurs via massive collisions, which can launch copious clouds dust that are warmed by the star and glow in infrared. We report real-time detection a debris-producing impact planet zone around 35-million year-old solar analog star. observed substantial brightening debris disk at 3-5 {\mu}m, followed decay over year, with quasi-periodic modulations flux. behavior is consistent occurrence violent produced vapor out thick cloud silicate spherules...
Luminous debris disks of warm dust in the terrestrial planet zones around solar-like stars are recently found to vary, indicative ongoing large-scale collisions rocky objects. We use Spitzer 3.6 and 4.5 {\mu}m time-series observations 2012 2013 (extended 2014 one case) monitor 5 more with unusually high fractional luminosities ("extreme disk"), including P1121 open cluster M47 (80 Myr), HD 15407A AB Dor moving group 23514 Pleiades (120 145263 Upper Sco Association (10 field star BD+20 307...
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...