Soojong Pak
A5013508257- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Radio Astronomy Observations and Technology
- Advanced optical system design
- Astro and Planetary Science
- Atomic and Molecular Physics
- Calibration and Measurement Techniques
- Optical Coatings and Gratings
- SAS software applications and methods
- Spectroscopy and Laser Applications
- Optical Systems and Laser Technology
- Molecular Spectroscopy and Structure
- CCD and CMOS Imaging Sensors
- High-pressure geophysics and materials
- Advanced Measurement and Metrology Techniques
- Orbital Angular Momentum in Optics
- Inertial Sensor and Navigation
Kyung Hee University
2015-2024
Korea Astronomy and Space Science Institute
2003-2021
Seoul National University
1999-2020
Texas A&M University
2018
The University of Texas at Austin
1994-2013
Netherlands Institute for Radio Astronomy
2010
Kangwon National University
2009
Institute of Space and Astronautical Science
2003-2007
Japan Aerospace Exploration Agency
2007
Association of Universities For Research In Astronomy
1998-2004
AKARI, the first Japanese satellite dedicated to infrared astronomy, was launched on 2006 February 21, and started observations in May of same year. AKARI has a 68.5 cm cooled telescope, together with two focal-plane instruments, which survey sky six wavelength bands from mid- far-infrared. The instruments also have capability for imaging spectroscopy range 2 - 180 micron pointed observation mode, occasionally inserted into continuous operation. in-orbit cryogen lifetime is expected be one...
Abstract The Far-Infrared Surveyor (FIS) is one of two focal-plane instruments on the AKARI satellite. FIS has four photometric bands at 65, 90, 140, and 160 $\mu \rm m$, uses kinds array detectors. arrays optics are designed to sweep sky with high spatial resolution redundancy. actual scan width more than eight arcminutes, pixel pitch matches diffraction limit telescope. Derived point-spread functions (PSFs) from observations asteroids similar those given by optical model. Significant...
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...
Context.We present the observational results of multi-colour optical monitoring eight red blazars from 2003 September to 2004 February.Aims.The aim our is investigate spectral variability as well flux variations at short and long time scales.Methods.The observations were carried out using 1.0 m robotic telescope Mt. Lemmon Optical Astronomy Observatory, in Arizona, USA, 0.6 Sobaeksan Observatory 1.8 Bohyunsan Republic Korea.Results.During observations, all sources show strong with amplitudes...
AKARI (formerly ASTRO-F) is an infrared space telescope designed for all-sky survey at 10-180 (mu)m, and deep pointed surveys of selected areas 2-180 (mu)m. The with will significantly advance our understanding galaxy evolution, the structure formation Universe, nature buried AGNs, cosmic background. Here we describe important characteristics mission: orbit, attitude control system, investigate optimum area based on updated pre-flight sensitivities AKARI, taking into account cirrus confusion...
The Korea Astronomy and Space Science Institute (KASI) the Department of at University Texas Austin (UT) are developing a near infrared wide-band high resolution spectrograph, IGRINS. IGRINS can observe all H- K-band atmospheric windows with resolving power 40,000 in single exposure. spectrograph uses white pupil cross-dispersed layout includes dichroic to divide light between separate H K cameras, each provided 2kx2k HgCdTe detector. A silicon immersion grating serves as primary disperser...
The chemical structure of neutral clouds in low metallicity environments is examined with particular emphasis on the H to H_2 and C+ CO transitions. We observed near-IR lines J=1-0 line from 30 Doradus N159/N160 Large Magellanic Cloud DEM S 16, 37, LI-SMC 36 Small Cloud. find that emission UV-excited (weak) always exists (in our surveyed regions) toward positions where [CII] have been detected. Using a PDR code radiative transfer code, we simulate radiation spherical large planar clouds....
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...
The Immersion GRating INfrared Spectrometer (IGRINS) was designed for high-throughput with the expectation of being a visitor instrument at progressively larger observing facilities. IGRINS achieves R∼45000 and > 20,000 resolution elements spanning H K bands (1.45-2.5μm) by employing silicon immersion grating as primary disperser volume-phase holographic gratings cross-dispersers. After commissioning on 2.7 meter Harlan J. Smith Telescope McDonald Observatory, had more than 350 scheduled...
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...
The quasar 3C 279 was the target of an extensive multiwavelength monitoring campaign from 2006 January through April. An optical-IR-radio by Whole Earth Blazar Telescope (WEBT) collaboration organized around target-of-opportunity X-ray and soft γ-ray observations with Chandra INTEGRAL in mid-January, additional coverage RXTE Swift XRT. In this paper we focus on results WEBT campaign. source exhibited substantial variability optical flux spectral shape, a characteristic timescale few days....
Recent studies suggest that faint active galactic nuclei may be responsible for the reionization of universe. Confirmation this scenario requires spectroscopic identification quasars (M1450 > −24 mag) at z ≳ 6, but only a very small number such have been spectroscopically identified so far. Here, we report discovery quasar IMS J220417.92+011144.8 ∼ 6 in 12.5 deg2 region SA22 field Infrared Medium-deep Survey (IMS). The spectrum shows sharp break ∼8443 Å, with emission lines redshifted to =...
Abstract. Global three-dimensional data are a key to understanding gravity waves in the mesosphere and lower thermosphere. MATS (Mesospheric Airglow/Aerosol Tomography Spectroscopy) is new Swedish satellite mission that addresses this need. It applies space-borne limb imaging combination with tomographic spectroscopic analysis obtain wave on relevant spatial scales. Primary measurement targets O2 atmospheric band dayglow nightglow near infrared, sunlight scattered from noctilucent clouds...
Abstract We present fundamental parameters for 110 canonical K - and M -type (1.3−0.13 ⊙ ) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination of effective temperature ( T eff ), surface gravity (log g magnetic-field strength (B), projected rotational velocity <?CDATA $v\sin i$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>v</mml:mi> <mml:mi>sin</mml:mi> <mml:mi>i</mml:mi> </mml:math> ). Our method employed...
We present a deep near-infrared spectrum of the Orion Bar Photodissociation Region (PDR) taken with Immersion Grating INfrared Spectrometer (IGRINS) on 2.7 m telescope at McDonald Observatory. IGRINS has high spectral resolution (R~45000) and instantaneous broad wavelength coverage (1.45-2.45 microns), enabling us to detect 87 emission lines from rovibrationally excited molecular hydrogen (H_2) that arise transitions out 69 upper rovibration levels electronic ground state. These cover large...
Faint $z\sim5$ quasars with $M_{1450}\sim-23$ mag are known to be the potentially important contributors ultraviolet ionizing background in post-reionization era. However, their number density has not been well determined, making it difficult assess role early ionization of intergalactic medium (IGM). In this work, we present updated results our quasar survey using Infrared Medium-deep Survey (IMS), a near-infrared imaging covering an area 85 deg$^{2}$. From spectroscopic observations Gemini...
In this paper, we report results of our near-infrared (NIR) photometric variability studies the BL Lacertae (BL Lac) object S5 0716+714. NIR observations were spread over seven nights during observing run on 2007 April 2–9 at 1.8 m telescope equipped with Korea Astronomy and Space Science Institute Near-Infrared Camera System J, H, Ks filters Bohyunsan Optical Observatory, South Korea. We searched for intra-day (IDV), short-term variability, color in Lac object. have not detected any genuine...
We present a five (u*,g',r',i',z') band optical photometry catalog of the sources in North Ecliptic Pole (NEP) region based on deep observations made with MegaCam at CFHT. The source covers about 2 square degree area centered NEP and reaches depths 26 mag for u*, g', r' bands, 25 i' band, 24 z' (4 sigma detection over an 1 arcsec aperture). total number cataloged brighter than r'= 23 is 56,000 including both point extended sources. From investigation photometric properties using...
The BL Lac object 3C 66A was the target of an extensive multiwavelength monitoring campaign from July 2003 through April 2004, involving observations throughout electromagnetic spectrum. Radio, infrared, and optical were carried out by WEBT-ENIGMA collaboration. At higher energies, observed in X-rays (RXTE), at very-high-energy (VHE) gamma-rays (STACEE, VERITAS). In addition, source has been with VLBA 9 epochs period September - December including 3 contemporaneous core campaign.The WEBT...
We present multi-wavelength observations of a typical long duration GRB 120326A at $z=1.798$, including rapid using submillimeter array (SMA), and comprehensive monitoring in X-ray optical. The SMA observation provided the fastest detection to date among seven afterglows 230 GHz. prompt spectral analysis, Swift Suzaku yielded peak energy $E^{\rm src}_{\rm peak}=107.8^{+15.3}_{-15.3}$ keV equivalent isotropic $E_{\rm iso}$ as $3.18^{+0.40}_{-0.32}\times 10^{52}$ erg. temporal evolution...
Abstract This paper presents the Local Volume Mapper (LVM) telescope system. LVM is one of three surveys that form fifth generation Sloan Digital Sky Survey (SDSS-V), and it employs a coordinated network four, 16 cm diameter telescopes feeding integral field units (IFUs) leading to fiber spectrographs. One hosts science IFU, while two others observe adjacent fields calibrate geocoronal emission. The fourth makes rapid observations bright stars compensate for telluric absorption. entrance...