A5075955548- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Plant Water Relations and Carbon Dynamics
- Inertial Sensor and Navigation
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Methane Hydrates and Related Phenomena
- Molecular Spectroscopy and Structure
- Music Technology and Sound Studies
- Optical and Acousto-Optic Technologies
- Optical Systems and Laser Technology
- Photonic and Optical Devices
- Soil Moisture and Remote Sensing
- Thermography and Photoacoustic Techniques
- Particle Accelerators and Free-Electron Lasers
- Optical Polarization and Ellipsometry
- Context-Aware Activity Recognition Systems
- Dark Matter and Cosmic Phenomena
University of Science and Technology of China
2019-2025
Seoul National University
2016-2024
Kyung Hee University
2011-2017
The Immersion Grating Infrared Spectrometer (IGRINS) is a compact high-resolution near-infrared cross-dispersed spectrograph whose primary disperser silicon immersion grating. IGRINS covers the entire portion of wavelength range between 1.45 and 2.45μm that accessible from ground does so in single exposure with resolving power 40,000. Individual volume phase holographic (VPH) gratings serve as cross-dispersing elements for separate arms covering H K bands. On 2.7m Harlan J. Smith telescope...
Abstract We present the main results from a long-term reverberation mapping campaign carried out for Seoul National University AGN Monitoring Project (SAMP). High-quality data were obtained during 2015–2021 32 luminous active galactic nuclei (AGNs; i.e., continuum luminosity in range of 10 44–46 erg s −1 ) at regular cadence, 20–30 days spectroscopy and 3–5 photometry. obtain time lag measurements between variability H β emission AGNs; 25 those have best based on our quality assessment,...
The Immersion Grating Infrared Spectrometer (IGRINS) is a revolutionary instrument that exploits broad spectral coverage at high-resolution in the near-infrared. IGRINS employs silicon immersion grating as primary disperser, and volume-phase holographic gratings cross-disperse H K bands onto Teledyne Hawaii-2RG arrays. use of an facilitates compact cryostat while providing simultaneous wavelength from 1.45 - 2.5 μm. There are no cryogenic mechanisms its high-throughput design maximizes...
We present the single-epoch black hole mass (M$_{\rm BH}$) calibrations based on rest-frame UV and optical measurements of Mg II 2798\AA\ H$\beta$ 4861\AA\ lines AGN continuum, using a sample 52 moderate-luminosity AGNs at z$\sim$0.4 z$\sim$0.6 with high-quality Keck spectra. combine this large number luminous from Sloan Digital Sky Survey to increase dynamic range for better comparison velocity luminosity measurements. With respect reference M$_{\rm BH}$ line dispersion continuum 5100\AA,...
Abstract We analyze a sample of ~113,000 galaxies ( z < 0.3) from the Sloan Digital Sky Survey, divided into star-forming, composite, Seyfert, and LINER types, to explore relationships between UV-to-optical colors u – r ), star formation rates (SFRs), specific SFRs (sSFRs), stellar velocity dispersions σ * mass accretion onto black hole <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>L</mml:mi> </mml:mrow> <mml:mo...
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 The Fe ii /Mg line flux ratio has been used to investigate the chemical evolution of high-redshift active galactic nuclei (AGNs). No strong found out z ∼ 6, implying that SN 1a activity already occurred in early universe. However, trend no can be caused by sample selection bias because previous studies have utilized mostly very luminous AGNs, which may chemically matured at observed redshift. As motivated previously reported correlation between AGN luminosity and metallicity, we...
Abstract The broad-line region (BLR) size–luminosity relation has paramount importance for estimating the mass of black holes in active galactic nuclei (AGNs). Traditionally, size H β BLR is often estimated from optical continuum luminosity at 5100 Å, while α and its correlation with much less constrained. As a part Seoul National University AGN Monitoring Project, which provides 6 yr photometric spectroscopic monitoring data, we present our measurements lags high-luminosity AGNs. Combined...
Abstract We present single-epoch black hole mass ( M BH ) estimators based on the rest-frame ultraviolet (UV) Mg ii 2798 Å and optical H β 4861 emission lines. To enlarge luminosity range of active galactic nuclei (AGNs), we combine 31 reverberation-mapped AGNs with relatively low luminosities from Bahk et al., 47 moderate-luminosity Woo 425 high-luminosity Sloan Digital Sky Survey. The combined sample has a monochromatic at 5100 in <?CDATA $\mathrm{log}\lambda {L}_{5100}\sim...
Abstract We have analyzed the temperature, velocity, and density of H 2 gas in NGC 7023 with a high-resolution near-infrared spectrum northwestern filament reflection nebula. By observing K bands at R ≃ 45,000 Immersion GRating INfrared Spectrograph, we detected 68 emission lines within 1″ × 15″ slit. The diagnostic ratio 2-1 S(1)/1-0 S(1) is 0.41−0.56. In addition, estimated ortho-to-para (OPR) 1.63−1.82, indicating that transitions observed region arise mostly from excited by UV...
Abstract We present a study of the relation between [O iii ] 5007 Å emission line width ( σ III ) and stellar velocity dispersion * ), utilizing sample 740 type 1 active galactic nuclei (AGNs) with high-quality spectra at redshift z < 1.0. find broad correlation core component <?CDATA ${\sigma }_{[{\rm{O}}{\rm\small{III}},\mathrm{core}]}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mo...
We report a study of the three-dimensional (3D) outflow structure 15$\arcsec$ $\times$ 13$\arcsec$ area around H$_{2}$ peak 1 in Orion KL with slit-scan observations (13 slits) using Immersion Grating Infrared Spectrograph. The datacubes, high velocity-resolution ($\sim$ 7.5 {\kms}) provide contrast imaging within ultra-narrow bands, and enable detection main stream previously reported fingers. identified 31 distinct fingers 1$-$0 S(1) $\lambda$2.122 $\micron$ emission. line profile at each...
Abstract We present spatially resolved gas kinematics, ionization, and energetics of 11 type 1 5 2 active galactic nuclei (AGNs) with strong ionized outflows at z <0.3 using Gemini Multi-Object Spectrograph Integral Field Unit data. find a strongly blueshifted region in [O iii ] velocity maps, representing an approaching cone biconical outflows, redshifted regions H α which show gravitationally rotating kinematics. AGN photoionization is dominant the central most targets, some them also...
Abstract We introduce our project, AGNSTRONG (Active Galactic Nuclei and STaR fOrmation in Nearby Galaxies). Our research goals encompass investigating the kinematic properties of ionized molecular gas outflows, understanding impact AGN feedback, exploring coevolution dynamics between strength activity star formation activity. aim to conduct a thorough analysis determine whether there is an increase or suppression rates (SFRs) among targets with without powerful relativistic jets. sample...
The spectral energy distribution of blazars around the synchrotron peak can be well described by log-parabolic model that has three parameters: ($E_\textrm{p}$), luminosity ($L_\textrm{p}$) and curvature parameter ($b$). It been suggested $E_\textrm{p}$ shows relations with $L_\textrm{p}$ $b$ in several sources, which used to constrain physical properties emitting region and/or acceleration processes particles. We systematically study $E_\textrm{p}$-$L_\textrm{p}$ $E_\textrm{p}$-(1$/b$) for...
Abstract To investigate the connection between radioactivity and active galactic nucleus (AGN) outflows, we present a study of ionized-gas kinematics based on an [O iii ] λ 5007 emission line along large-scale radio jet for six AGNs. These AGNs are selected (i.e., <?CDATA ${L}_{1.4\mathrm{GHz}}\geqslant {10}^{39.8}\,\mathrm{erg}\,{{\rm{s}}}^{-1}$?> ) as well optical emission-line properties type-2 Using Red Channel Cross Dispersed Echellette Spectrograph at Multiple Mirror Telescope, in...
ABSTRACT We present the results of high-resolution near-IR spectroscopy toward multiple outflows around Herbig Be star LkH α 234 using Immersion Grating Infrared Spectrograph. Previous studies indicate that region is complex, with several embedded young stellar objects and associated them. In simultaneous H - K -band spectra from HH 167, we detected 5 [Fe ii ] 14 2 emission lines. revealed a new jet driven by radio continuum source VLA 3B. Position–velocity diagrams 1−0 S(1) λ 2.122 μ m line...
We present the kinematical properties of UV and optical \FeII\ emission gas based on velocity shift line width measurements a sample 223 Type 1 active galactic nuclei (AGNs) at 0.4 $<$ z 0.8. find strong correlation between widths lines, indicating that both features arise from similar distances in broad region (BLR). However, detail we differing trends, depending \FeII. While shifts dispersions Fe II (\FeUV) (\FeOPT) lines are comparable to each other for AGNs with relatively narrow \FeOPT\...
We investigate the ionized gas kinematics relationship with X-ray, radio and accreting properties using a sample of 348 nearby (z<0.4) SDSS-FIRST-X-ray detected AGNs. X-ray our are obtained from XMM-Newton, Swift Chandra observations. unveil outflows in manifested by non-gravitational broad component [O iii]λ5007Å emission line profiles. From comparison correlation non-parametric outflow velocities (i.e., velocity width, maximal dispersion) luminosity luminosity, we find that have...
We present medium resolution (R = 5000 - 6000) spectra in the near-infrared band, 1.4 1.8 <TEX>${\mu}m$</TEX>, for template stars G, K, and M types observed by echelle spectrometer, IRCS, at SUBARU 8.2 m telescope. The identification of lines is based on Arcturus (K2 III) literature. measured equivalent widths compared our results to those Meyer et al. (1998). conclude that spectral data can investigate more accurately properties stellar spectra. library ASCII format are available download...
Abstract We present an analysis of near-infrared, high-resolution spectroscopy toward the flat-spectrum young stellar object (YSO) ESO H α 279a (∼1.5 M ⊙ ) in Serpens star-forming region at a distance 429 pc. Using Immersion GRating INfrared Spectrometer (IGRINS; R ≈ 45,000), we detect emission lines originating from accretion channel flow, jet, and inner disk. Specifically, identify hydrogen Brackett series recombination, [Fe ii ], iii iv Ca i , Na 2 O, CO overtone lines. By modeling five...