A5100648843- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Water Quality Monitoring and Analysis
- Anesthesia and Neurotoxicity Research
- Atmospheric Ozone and Climate
- Intensive Care Unit Cognitive Disorders
- Interactive and Immersive Displays
- Anesthesia and Sedative Agents
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Odor and Emission Control Technologies
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Fiscal Policies and Political Economy
- Augmented Reality Applications
- Atomic and Molecular Physics
- Advanced Optical Imaging Technologies
Korea Astronomy and Space Science Institute
2020-2024
Gongju National University of Education
2024
Kongju National University
2024
National Institute of Environmental Research
2010-2023
Seoul National University
2001-2020
Korea Advanced Institute of Science and Technology
2011-2013
Advances in dynamic gesture recognition technologies now make it possible to investigate freehand input techniques. This study tried understand how users manipulate digital content on a distant screen by hand interaction living room environment. While there have been many existing studies that techniques, we developed and applied novel methodology based combination of both an user elicitation conventional Wizard-of-Oz involved another non-technical for providing feedback. Through the study,...
In several recent observational studies on Type Ib/c supernovae (SNe Ib/c), the inferred ejecta masses have a peak value of 2.0 -- 4.0 $M_\odot$, in favor binary scenario for their progenitors rather than Wolf-Rayet star scenario. To investigate properties relatively low-mass helium stars systems as SN progenitors, we constructed atmospheric models with non-LTE radiative transfer code CMFGEN, using evolution models. We find that these can be characterized by narrow emission lines if...
Most stars form in multiple star systems. For a better understanding of their formation processes, it is important to resolve the individual protostellar components and surrounding envelope disk material at earliest possible epoch because history can be lost few orbital timescales. Here we present ALMA observational results young system, IRAS 04239+2436, where three well-developed large spiral arms were detected shocked SO emission. Along most conspicuous arm, accretion streamer was also...
ABSTRACT Recent high-resolution infrared space missions have revealed supernova remnants (SNRs) of diverse morphology in (IR) dust emission that are often very different from their X-ray appearance. The observed range infrared-to-X-ray (IRX) flux ratios SNRs is also wide. For a sample 20 Galactic SNRs, we obtain IR and properties investigate the physical causes for such large differences. We find IRX ( <?CDATA ${R}_{{\rm{IRX,obs}}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Abstract The Immersion GRating INfrared Spectrometer (IGRINS) is a compact, high-resolution ( R ∼ 45,000) near-infrared spectrograph spanning 1.45–2.45 μ m in single exposure. We introduce the Raw and Reduced IGRINS Spectral Archive (RRISA), which provides public data access for all non-proprietary taken at McDonald Observatory's Harlan J. Smith Telescope, Lowell Discovery Telescope (formerly Channel Telescope), Gemini South. RRISA to raw files, reduced products, cross-matched targets with...
Abstract We present a long-exposure (∼10 hr), narrowband image of the supernova (SN) remnant Cassiopeia A (Cas A) centered at 1.644 μ m emission. The passband contains [Fe ii ] and [Si i 1.645 lines, our “deep ]+[Si image” provides an unprecedented panoramic view Cas A, showing both shocked unshocked SN ejecta, together with circumstellar medium subarcsecond (∼0.″7 or 0.012 pc) resolution. diffuse emission from ejecta has form clumps, filaments, arcs, their spatial distribution correlates...
The United Kingdom Infrared Telescope (UKIRT) Widefield Survey for Fe$^+$ (UWIFE) is a 180 deg$^2$ imaging survey of the first Galactic quadrant (7$^{\circ}$ < l 62$^{\circ}$; |b| 1.5$^{\circ}$) using narrow-band filter centered on [Fe II] 1.644 {\mu}m emission line. good tracer dense, shock-excited gas, and will probe violent environments around stars: star-forming regions, evolved stars, supernova remnants, among others. UWIFE designed to complement existing UKIRT H2 (UWISH2; Froebrich et...
We report new mid-infrared (MIR) observations of the remarkable object IRAS 15099−5856 using space telescopes AKARI and Spitzer, which demonstrate presence prominent crystalline silicate emission in this bright source. has a complex morphology with central compact source (IRS1) surrounded by knots, spurs, several extended (∼4') arc-like filaments. The is seen only at ⩾10 μm. Spitzer spectrum IRS1 shows features from Mg-rich silicates, strong [Ne ii] 12.81 μm, other faint ionic lines. model...
[Fe II] emission lines are prominent in the infrared (IR), and they important diagnostic tools for radiative atomic shocks. We investigate characteristics of using a shock code developed by Raymond (1979) with updated parameters. first review general IR from shocked gas, derive line fluxes as function speed ambient density. have compiled available observations interstellar shocks compare them to ratios predicted our model. The sample includes both young old supernova remnants Galaxy Large...
We present the results of broadband near-infrared spectroscopic observations recently discovered mysterious stellar objects in young supernova remnant G54.1+0.3. These objects, which show significant mid-infrared excess emission, are embedded a diffuse loop structure ~1 arcmin radius. Their spectra reveal characteristics late O- or early B-type stars with numerous H and He I absorption lines, we classify their spectral types to be between O9 B2 based on an empirical relation derived here...
Abstract We investigate the effects of winds on observational properties Type Ib and Ic supernova (SN Ib/Ic) progenitors using spectral models constructed with non-LTE stellar atmospheric code CMFGEN. consider SN Ib/Ic progenitor final mass range 2.16–9.09 M ⊙ having different surface temperatures chemical compositions, calculate resulting spectra for various wind mass-loss rates terminal velocities. find that an optically thick would become brighter in optical a higher rate (or lower...
We present [Fe II] 1.64 μm imaging observations for jets and outflows from young stellar objects (YSOs) over the northern part (~ 24'x45') of Carina Nebula, a massive star forming region. The were performed with IRIS2 Anglo-Australian Telescope seeing was ~1.5"+-0.5". Eleven jet outflow features are detected at eight different regions, named as Ionized Fe Objects (IFOs). One Herbig-Haro object candidate missed in Hubble Space Hα is newly identified HHc-16, referring our images. IFOs have...
We present the results of wide integral-field near-infrared (1.0–1.8 μm) spectroscopic observations southeastern shell young core-collapse supernova remnant (SNR) G11.2−0.3. first construct [Fe ii] 1.644 μm line images three bright clumps from obtained spectral image cubes and compare them with those other transitions such as 1.257, 1.534, He i 1.083 images. This allows us to estimate electron density (∼4700–9400 cm−3) extinction (AV ∼ 16–20 mag) shell, including a detailed two-dimensional...
We present star formation activity in the infrared dark cloud (IRDC) G53.2, a remarkable IRDC located at Galactic coordinates based on census of young stellar object (YSO) candidates. G53.2 was previously identified as several IRDCs mid-IR images, but it is fact long ( pc) cloud, well consistent with CO km s−1 (or kpc). point-source catalog that contains ∼370 sources from our photometry Spitzer MIPS 24 μm data and Legacy Infrared Mid-Plane Survey Extraordinaire Catalog. The classification...
We present [Fe ii] 1.644 μm features around ultracompact H ii regions (UCHIIs) found on a quest for the "footprint" outflow of UCHIIs—the produced by outflowing materials ejected during an earlier, active accretion phase massive young stellar objects (MYSOs). surveyed 237 UCHIIs in first Galactic quadrant, employing CORNISH UCHII catalog and UWIFE data, which is imaging survey performed with UKIRT-WFCAM under ∼08 seeing conditions. The were five UCHIIs, one was less plausible. interpret to...
IRAS 15099-5856 in the young supernova remnant (SNR) MSH 15-52 is first and only SNR-associated object with crystalline silicate dust detected so far, although its nature origin of are still unclear. In this paper, we present high-resolution mid-infrared (MIR) imaging observations bright central compact source IRS1 to study spatial distributions gas analysis Spitzer MIR spectrum explore IRS1. The images obtained T-ReCS attached on Gemini South telescope show a complicated, inhomogeneous...
This paper describes hidden interfaces as an important feature of touch screen based mobile phones and explores their impacts in user experience. Six sessions focus group study were conducted to identify some patterns how people explore use depending on motivations---either passive or active. Then values the further discussed from utilitarian (efficient control at cost low cognitive load), emotional (engagement attachment), social perspectives (elatedness & sense community). We expect these...
We present a parsec-scale molecular hydrogen (H$_2$ 1-0 S(1) at 2.12~\micron) outflow discovered from the UKIRT Widefield Infrared Survey for H$_2$. The is located in infrared dark cloud core MSXDC G053.11+00.05 MM1 1.7 kpc and likely associated with two young stellar objects (YSOs) center. overall morphology of bipolar along NE-SW direction brighter lobe to southwest, but detailed structure consists several flows knots. With total length $\sim$1 pc, luminosity fairly high $L_{\rm H_{2}} >...
ABSTRACT We explore systematically the shocked gas in first Galactic quadrant of Milky Way using United Kingdom Infrared Telescope (UKIRT) Wide-field Survey for Fe+ (UWIFE). The UWIFE survey is imaging [Fe ii] 1.644 μm emission line and covers plane (7° &lt; $\mathit {l}$ 62°; $|b| $ ≲ 1$_{.}^{\circ }$5). identify 204 extended ionized Fe objects (IFOs) a combination manual automatic search. Most IFOs are detected time line. present catalogue measured sizes fluxes searched their...
Abstract IRAS 15099-5856 in the young supernova remnant (SNR) MSH 15−52 is first and only SNR-associated object with crystalline silicate dust detected so far, although its nature origin of are still unclear. In this paper, we present high-resolution mid-infrared (MIR) imaging observations bright central compact source IRS1 to study spatial distributions gas analysis Spitzer MIR spectrum explore IRS1. The images obtained T-ReCS attached on Gemini South telescope show a complicated,...
The stellar initial mass function (IMF) is a key parameter to understand the star formation process and integrated properties of populations in remote galaxies. We present spectroscopic study young massive clusters (YMCs) starburst galaxies NGC 4038/39. spectra seven YMCs obtained with GMOS-S attached 8.2-m Gemini South telescope reveal spectral features associated ages underlying IMFs. constrain using absorption lines strong emission bands from Wolf-Rayet stars. internal reddening also...