The Chemical and Ionization Conditions in Weak Mg II Absorbers (2008)
Narayanan, Anand, Charlton, Jane C., Misawa, Toru, Green, Rebecca E., Kim, Tae-Sun
We present an analysis of the chemical and ionization conditions in a sample of 100 weak Mg II absorbers identified in the VLT/UVES archive of quasar spectra. Using a host of low ionization lines...
Analysis of Three Dimensional Cracks Subjected to the Mode I Loading by Using FEAM (2008)
The finite element alternating method is extended further for general three dimensional cracks in an isotropic body subjected to the mode I loading. The required analytical solution for a dime...
On the importance of high redshift intergalactic voids (2008)
Viel, Matteo, Colberg, Joerg M., Kim, Tae-Sun
We investigate the properties of one--dimensional flux ``voids'' (connected regions in the flux distribution above the mean flux level) by comparing hydrodynamical simulations of large cosmological...
A Homogeneous Sample of Sub-DLAs IV: Global Metallicity Evolution (2007)
Peroux, Celine, Dessauges-Zavadsky, Miroslava, D'Odorico, Sandro, Kim, Tae-Sun, McMahon, Richard G.
An accurate method to measure the abundance of high-redshift galaxies consists in the observation of absorbers along the line of sight toward a background quasar. Here, we present abundance...
The Kinematic Evolution of Strong MgII Absorbers (2007)
Mshar, Andrew C., Charlton, Jane C., Lynch, Ryan S., Churchill, Chris, Kim, Tae-Sun
We consider the evolution of strong (W_r(2796) > 0.3A) MgII absorbers, most of which are closely related to luminous galaxies. Using 20 high resolution quasar spectra from the VLT/UVES public...
Schaye, Joop, Carswell, Robert F., Kim, Tae-Sun
We carried out a survey for high-metallicity C IV absorbers at redshift z ~ 2.3 in the spectra of 9 high-quality quasar spectra. Using a novel analysis technique, based on detections of C IV lines...
A Survey of Weak MgII Absorbers at 0.4 < z < 2.4 (2007)
Narayanan, Anand, Misawa, Toru, Charlton, Jane C., Kim, Tae-Sun
We present results from a survey of weak MgII absorbers in the VLT/UVES spectra of 81 QSOs obtained from the ESO archive. In this survey, we identified 112 weak MgII systems within the redshift...
The AGN Outflow in the HDFS Target QSO J2233-606 from a High-Resolution VLT/UVES Spectrum (2006)
Gabel, Jack R., Arav, Nahum, Kim, Tae-Sun
We present a detailed analysis of the intrinsic UV absorption in the central HDFS target QSO J2233-606, based on a high-resolution, high S/N (~25 -- 50) spectrum obtained with VLT/UVES. This spectrum...
A survey of weak MgII absorbers at redshift =1.78 (2005)
Lynch, Ryan S., Charlton, Jane C., Kim, Tae-Sun
The exact nature of weak MgII absorbers (those with W_r(2796) < 0.3 A) is a matter of debate, but most are likely related to areas of local star formation or supernovae activity outside of giant...
Metallicity of the intergalactic medium using pixel statistics: III. Silicon (2003)
Aguirre, Anthony, Schaye, Joop, Kim, Tae-Sun, Theuns, Tom, Rauch, Michael, Sargent, Wallace L. W.
(Modified) We study the abundance of silicon in the intergalactic medium by analyzing the statistics of SiIV, CIV, and HI pixel optical depths in a sample of 19 high-quality quasar absorption spectra...
Schaye, Joop, Aguirre, Anthony, Kim, Tae-Sun, Theuns, Tom, Rauch, Michael, Sargent, Wallace L. W.
(Modified) We measure the distribution of carbon in the intergalactic medium as a function of redshift z and overdensity delta. Using a hydrodynamical simulation to link the H I absorption to the...
The physical properties of the Ly-Alpha forest at z > 1.5 (2002)
Kim, Tae-Sun, Carswell, Robert F., Cristiani, Stefano, D'Odorico, Sandro, Giallongo, Emanuele
Combining a new, increased dataset of 8 QSOs covering the Ly-alpha forest at redshifts 1.5 < z < 3.6 from VLT/UVES observations with previously published results, we have investigated the properties...
The Extended Emission-Line Region of 4C 37.43 (2002)
Stockton, Alan, MacKenty, John W., Hu, Esther M., Kim, Tae-Sun
We have explored the nature of the extended emission-line region around the z=0.37 quasar 4C 37.43, using extensive ground-based and HST imaging and spectroscopy. The velocity field of the ionized...
Carswell, Robert F., Schaye, Joop, Kim, Tae-Sun
A search for O VI at redshifts corresponding to Ly-alpha lines in the z_em ~ 2.4 QSOs HE1122-1648 and HE2217-2818 reveals that a substantial fraction of those with H I column densities log N(HI) > 14...
Constraints on reionization from the thermal history of the intergalactic medium (2002)
Theuns, Tom, Schaye, Joop, Zaroubi, Saleem, Kim, Tae-Sun, Tzanavaris, Panayiotis, Carswell, Bob
The temperature of the diffuse, photo-heated intergalactic medium (IGM) depends on its reionization history because the thermal time scales are long. The widths of the hydrogen Lyman-alpha absorption...
The evolution of the physical state of the IGM (2002)
Kim, Tae-Sun, Cristiani, Stefano, D'Odorico, Sandro
Using a new, increased dataset of 7 QSOs from VLT/UVES observations combined with one QSO from the literature, the minimum Doppler parameters as a function of neutral hydrogen column density N(HI),...
Temperature fluctuations in the intergalactic medium (2001)
Theuns, Tom, Zaroubi, Saleem, Kim, Tae-Sun, Tzanavaris, Panayiotis, Carswell, Robert F.
The temperature of the low-density intergalactic medium is set by the balance between adiabatic cooling resulting from the expansion of the universe, and photo-heating by the UV-background. We have...
Theuns, Tom, Zaroubi, Saleem, Kim, Tae-Sun
The temperature of the low-density intergalactic medium is set by the balance between adiabatic cooling resulting from the expansion of the universe, and photo-heating by the UV-background. A sudden...
Bianchi, Simone, Cristiani, Stefano, Kim, Tae-Sun
We have modelled the evolution of the number of Ly_alpha absorbers with redshift, resulting from the evolution of the ionising background and the Hubble expansion. The contribution of quasars (QSOs)...
The Lyman-Alpha Forest at 1.5 < z < 4 (2000)
Kim, Tae-Sun, Cristiani, Stefano, D'Odorico, Sandro
Using high resolution (R ~ 45000), high S/N (20-50) VLT/UVES observations covering the Lyman-alpha forest at 1.5 < z < 2.4 combined with similar observations at z > 2.4 from the literature, we have...
The detection of oxygen in the low-density intergalactic medium (2000)
Schaye, Joop, Rauch, Michael, Sargent, Wallace L. W., Kim, Tae-Sun
The abundances of metals in the intergalactic medium (IGM) can be used to constrain the amount of star formation at high redshift and the spectral shape of the ionizing background radiation. For both...
The Lyman-Alpha forest at z] 2 [microform] / (1999)
Thesis (Ph. D.)--University of Hawaii at Manoa, 1999.
The Lyman-Alpha forest at z> 2 / (1999)
Thesis (Ph. D.)--University of Hawaii at Manoa, 1999.
The Redshift Evolution of the Lyman Alpha Forest (1997)
Kim, Tae-Sun, Hu, Esther M., Cowie, Lennox L., Songaila, Antoinette
We have analyzed the properties of low column density Lyman alpha forest clouds (12.8 < log N_HI < 16.0) toward 5 QSOs at different redshifts, using high signal-to-noise data from the HIRES...
The Distribution of Column Densities and b Values in the Lyman-Alpha Forest (1995)
Hu, Esther M., Kim, Tae-Sun, Cowie, Lennox L., Songaila, Antoinette, Rauch, Michael
We describe the properties of the Ly$\alpha$ forest in the column density range $\nhi \geq 2\times10^{12}$ cm$^{-2}$ based on 1056 lines in the wavelength range 4300--5100\AA measured in extremely...
Lim, Dong-Ho, Kim, Tae-Sun, Joo, Sung-Pil, Kim, Soo Han
Hematomas caused by ruptured traumatic pseudoaneurysms of the middle meningeal artery (MMA) usually present with extradural hematomas, whereas intradural intraparenchymal hematomas are extremely...
An Unusual Case of a Thrombosed Giant Distal PICA Aneurysm Simulating a Large Cavernous Angioma
Lim, Dong-Ho, Jung, Shin, Jung, Tae-Young, Kim, Tae-Sun
A 64-year-old woman was referred to our hospital with a one-month history of progressive headache. Magnetic resonance imaging (MRI) showed a hemorrhagic mass adjacent to the left inferior cerebellar...
Pituitary Apoplexy Presenting as Isolated Third Cranial Nerve Palsy with Ptosis : Two Case Reports
Cho, Won-Jin, Joo, Sung-Pil, Kim, Tae-Sun, Seo, Bo-Ra
Pituitary apoplexy is a clinical syndrome caused by an acute ischemic or hemorrhagic vascular accident involving a pituitary adenoma or an adjacent pituitary gland. Pituitary apoplexy may be...
Endothelial Nitric Oxide Gene T-786C Polymorphism and Subarachnoid Hemorrhage in Korean Population
Song, Min-Kyung, Kim, Myeong-Kyu, Kim, Tae-Sun, Joo, Sung-Pil, Park, Man-Seok, Kim, Byeong-Chae, ...
We aimed to elucidate whether the eNOS T-786C mutant allele is implicated in subarachnoid hemorrhage (SAH) susceptibility or vasospasm after SAH, and whether the mutant allele is differentially...