A5017487448- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Molecular Spectroscopy and Structure
- Semiconductor Quantum Structures and Devices
- Atmospheric Ozone and Climate
- Semiconductor Lasers and Optical Devices
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Advanced Semiconductor Detectors and Materials
- Gamma-ray bursts and supernovae
- Advanced Combustion Engine Technologies
- Quantum Dots Synthesis And Properties
- Photonic and Optical Devices
- Quantum and electron transport phenomena
- Astronomical Observations and Instrumentation
- Electronic Packaging and Soldering Technologies
- Quantum Information and Cryptography
- Semiconductor materials and devices
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- 3D IC and TSV technologies
National Sun Yat-sen University
2022-2025
Xi'an Technological University
2025
National Taiwan Normal University
2023-2025
Institute of Astronomy and Astrophysics, Academia Sinica
2015-2024
Southeast University
2024
European Southern Observatory
2016-2020
Chinese Academy of Sciences
2000-2018
National Laboratory for Superconductivity
2018
Institute of Physics
2018
Max Planck Institute for Radio Astronomy
2016
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations from the 2014 Long Baseline Campaign in dust continuum and spectral line emission HL Tau region. The images at wavelengths of 2.9, 1.3, 0.87 mm have unprecedented angular resolutions 0 075 (10 AU) to 025 (3.5 AU), revealing an astonishing level detail circumstellar disk surrounding young solar analog Tau, with a pattern bright dark rings observed all wavelengths. By fitting ellipses most distinct rings, we measure...
Abstract We present Atacama Large Millimeter/submillimeter Array Band 6 (1.3 mm) observations of dense cores in three massive molecular clouds within the central zone (CMZ) Milky Way, including Dust Ridge cloud e, Sgr C, and 20 km s −1 cloud, at a spatial resolution 2000 au. Among 834 identified from 1.3 mm continuum, we constrain temperatures linewidths 253 using local thermodynamic equilibrium methods to fit H 2 CO and/or CH 3 CN spectra. determine their masses dust continuum derived...
The use of a high-growth-temperature GaAs spacer layer is demonstrated to significantly improve the performance 1.3μm multilayer self-assembled InAs∕InGaAs dot-in-a-well lasers. inhibits threading dislocation formation, resulting in enhanced electrical and optical characteristics. Incorporation these layers allows fabrication quantum-dot devices emitting above 1.3μm, with extremely low room-temperature threshold current densities operation up 105°C.
Abstract Spatially resolved structures in protoplanetary disks hint at unseen planets. Previous imaging observations of the transitional disk around MWC 758 revealed an inner cavity, a ring-like outer disk, emission clumps, and spiral arms, all possibly generated by companions. We present ALMA dust continuum 0.87 mm wavelength with 43 × 39 mas angular resolution (6.9 6.2 au) 20 μ Jy beam −1 rms. The central submillimeter cavity is to be eccentric; once deprojected, its edge can well fitted...
Previous (sub)millimeter observations have found that the spectral indices of dust emission from some young stellar objects are lower than black body in Rayleigh-Jeans limit (i.e., 2.0). In particular, recent Atacama Large Millimeter Array spatially resolved innermost regions protoplanetary disks TW\,Hya and HD\,163296 present anomalously low $<$2.0) millimeter indices. previous works, such were considered unphysical attributed to measurement errors. The work clarifies if albedo is high...
We present the first constraint on Faraday rotation measure (RM) at submillimeter wavelengths for nucleus of M87. By fitting polarization position angles (χ) observed with Submillimeter Array four independent frequencies around ∼230 GHz and interpreting change in χ as a result external associated accretion flow, we determine RM M87 core to be between −7.5 × 105 3.4 rad m−2. Assuming density profile flow that follows power-law distribution magnetic field is ordered, radial, has equipartition...
Massive stars ($M > 8$ \msun) typically form in parsec-scale molecular clumps that collapse and fragment, leading to the birth of a cluster stellar objects. We investigate role magnetic fields this process through dust polarization at 870 $\mu$m obtained with Submillimeter Array (SMA). The SMA observations reveal scales $\lsim$ 0.1 pc. pattern these objects ranges from ordered hour-glass configurations more chaotic distributions. By comparing data single dish parsec scales, we found dense...
Abstract Filamentary structures are ubiquitous in high-mass star-forming molecular clouds. Their relation with star formation is still to be understood. Here we report interferometric observations toward eight filamentary A total of 50 dense cores identified these clouds, most which present signatures formation. Five them not associated any indicators and hence prestellar core candidates. Evolutionary phases their line widths, temperatures, <?CDATA ${\mathrm{NH}}_{3}$?> abundances, virial...
In recent years, the disk populations in a number of young star-forming regions have been surveyed with ALMA. Understanding properties and their correlation those central star is critical to understand planet formation. particular, decrease average measured dust mass age region has observed. We conducted high-sensitivity continuum ALMA observations 43 Class II stellar objects CrA at 1.3 mm (230 GHz). The typical spatial resolution 0.3". fluxes are used estimate masses disks, survival...
The structural and optical properties of GaAs-based 1.3 μm InAs/InGaAs dots-in-a-well (DWELL) structures have been optimized in terms different InGaAs GaAs growth rates, the amount InAs deposited, In composition quantum well (QW). An improvement efficiency is obtained by increasing rate layers. A transition from small dots (QDs), with a high density (∼5.3×1010 cm−2) broad size distribution, to larger low dot (∼3.6×1010 narrow occurs as coverage increased 2.6 2.9 monolayers. room-temperature...
The effects of a thin GaAsSb strain-reducing layer on the optical properties InAs∕GaAs quantum dots (QDs) are investigated. With increasing Sb composition, room-temperature emission wavelength InAs QDs increases to ∼1.43μm. For compositions above 14%, system becomes Type II, with decrease photoluminescence (PL) efficiency. At composition PL efficiency is maximized, and also significantly enhanced when compared that conventional InGaAs-capped grown under same conditions. Room-temperature...
We present the results of combined NH3 (1,1) and (2,2) line emission observed with Very Large Array Effelsberg 100 m telescope infrared dark cloud G14.225−0.506. The reveals a network filaments constituting two hub–filament systems. Hubs are associated gas rotational temperature Trot ∼ 15 K, non-thermal velocity dispersion σNT 1 km s−1, exhibit signs star formation, while appear to be more quiescent (Trot 11 K 0.6 s−1). Filaments parallel in projection distributed mainly along directions, at...
Subaru-HiCIAO observations on FU Orionis objects revealed asymmetric structures 10 2 to 3 AU scales of circumstellar disks and envelopes.
We report systematic mapping observations of the NH3 (1, 1) and (2, 2) inversion lines toward 62 high-mass star-forming regions using Very Large Array (VLA) in its D DnC array configurations. The VLA images cover a spatial dynamic range from 40'' to 3'', allowing us trace gas kinematics ∼1 pc scales ≲0.1 scales. Based on morphology infrared nebulosity 1 scales, we categorize three subclasses sample: filaments, hot cores, NH3-dispersed sources. ubiquitous filaments found have typical width...
The Multi-Scale Continuum and Line Exploration of W49 (MUSCLE W49) is a comprehensive gas dust survey the giant molecular cloud (GMC) W49A, most luminous star-formation region in Milky Way. It covers entire GMC at different scales angular resolutions. In this paper we present: 1) an all-configuration SMA mosaic 230-GHz band covering central 3 arcmin (10 pc, known as W49N), with embedded massive stars; 2) PMO 14m telescope observations 90-GHz band, maps up to 35 size, or 113 pc. We also make...
The long-term evolution of a circumstellar disk starting from its formation and ending in the T Tauri phase was simulated numerically with purpose studying dust distinct values viscous α-parameter fragmentation velocity v_frag. We solved numerical hydrodynamics equations thin-disk limit, which are modified to include component consisting two parts: sub-micron-sized grown maximum radius a_r. former is strictly coupled gas, while latter interacts gas via friction. conversion small dust,...
We present our observational results of the 1.1 mm continuum and HCO+ (3-2) line in HL Tau at angular resolutions 0.1" obtained with ALMA data analysis 2.9 (1-0) lines disk. The Keplerian rotation disk is well resolved emission, stellar mass estimated to be 2.1+/-0.2 Msun a inclination angle 47 deg. radial profiles column density excitation temperature are measured LTE two transitions emission. An gas gap radius 30 au, where drops by factor 4-8, found profile, coincident dust traced No other...
Context. Observations at millimeter wavelengths of bright protoplanetary disks have shown the ubiquitous presence structures such as rings and spirals in continuum emission. The derivation underlying properties emitting material is nontrivial because complex radiative processes involved. Aims. In this paper we analyze new observations from Atacama Large Millimeter/submillimeter Array (ALMA) Karl G. Jansky Very (VLA) high angular resolution corresponding to 5 – 8 au determine dust spatial...
Context . Previous high-angular-resolution 225 GHz (~1.3 mm) continuum observations of the transitional disk DM Tau have resolved an outer ring at 20–120 au radii that is weakly azimuthally asymmetric. Aims We aim to examine dust growth and filtration in Tau. Methods performed ~0″.06 (~8.7 au) resolution Karl G. Jansky Very Large Array (JVLA) 40–48 (~7 mm; Q band) observations, along with complementary lower frequencies. In addition, we analyzed archival JVLA undertaken since 2010. Results...
Abstract Massive star-forming regions exhibit a rich chemistry with complex gas distributions, especially on small scales. While surveys have yielded constraints typical conditions, they often coarse spatial resolution and limited bandwidths. Thus, to establish an interpretative framework for these efforts, detailed observations that simultaneously provide high sensitivity, resolution, large bandwidths subset of diverse sources are needed. Here, we present wide-band (≈32 GHz) Submillimeter...
Abstract We have observed the late Class I protostellar source Elias 29 at a spatial resolution of 70 au with Atacama Large Millimeter/submillimeter Array as part FAUST Program. focus on line emission SO, while that 34 C 18 O, CS, SiO, H 13 CO + , and DCO are used supplementarily. The distribution SO rotational temperature ( T rot (SO)) is evaluated by using intensity ratio its two excitation lines. Besides in vicinity protostar, hot spots found distance 500 from protostar; (SO) locally...
We have compiled the $\sim$4-400 GHz broad spectra of 32 Class II protoplanetary disks in Taurus-Auriga region, which represents brightest one-third sources detected submillimeter band this region. The at >20 frequency can be described with a piecewise function: (1) power law spectral index $\sim$2 >200 GHz, (2) range 0.3-4.2 20-50 and (3) transition region between these two laws characterized by sigmoid function. This suggests that flux densities <50 are dominated distinct emission...