19 citations · 89 across the 13 of their papers we have counts for
15 papers
High-Resolution Spectroscopy of Raman-scattered He II Lines in the Symbiotic Nova RR Telescopii
Jaejin Shin, Seok-Jun Chang, Hee-Won Lee +1
Raman-scattered emission features in symbiotic stars provide a powerful diagnostic of mass-loss and transfer processes, as they uniquely probe both ionized and neutral regions with…
High Resolution {\it BOES} Spectroscopy of Raman-scattered He~II6545 in Young Planetary Nebulae
Jin Lim, Seok-Jun Chang, Jaejin Shin +5
Young planetary nebulae (PNe) are characterized by their hot central stars and the presence of abundant neutral and molecular components, which result from significant mass loss du…
Circumgalactic Ly emission around submillimeter-bright galaxies with different quasar contributions
Vale González Lobos, Fabrizio Arrigoni Battaia, Seok-Jun Chang +6
We present VLT/MUSE observations targeting the extended Lyman- (Ly) emission of five high-redshift (3-4) submillimeter galaxies (SMGs) with increasing quasar (QSO) rad…
Twenty-Five Years of Accretion onto the Classical T Tauri Star TW Hya
Gregory J. Herczeg, Yuguang Chen, Jean-Francois Donati +39
Accretion plays a central role in the physics that governs the evolution and dispersal of protoplanetary disks. The primary goal of this paper is to analyze the stability over time…
Distribution and Kinematics of H I through Raman He II Spectroscopy of NGC 6302
Seok-Jun Chang, Hee-Won Lee, Jiyu Kim +1
The young planetary nebula NGC 6302 is known to exhibit Raman-scattered He II features at 6545 and 4851 Angstrom. These features are formed through inelastic scattering of He II$λλ…
Lyman-alpha Scattering Models Trace Accretion and Outflow Kinematics in T Tauri Systems
Nicole Arulanantham, Max Gronke, Eleonora Fiorellino +18
T Tauri stars produce broad Lyman-alpha emission lines that contribute 88% of the total UV flux incident on the inner circumstellar disks. Lyman-alpha photons are generated a…
Radiative Transfer in Lyα Nebulae: I. Modeling a Continuous or Clumpy Spherical Halo with a Central Source
Seok-Jun Chang, Yujin Yang, Kwang-Il Seon +2
To understand the mechanism behind high- Ly nebulae, we simulate the scattering of Ly in a halo about a central Ly source. For the first time, we consider bo…
Ly-alpha Radiative Transfer: A Stokes Vector Approach to Ly-alpha Polarization
Kwang-Il Seon, Hyunmi Song, Seok-Jun Chang
Ly-alpha emitting galaxies and giant Ly-alpha blobs (LABs) have been extensively observed to study the formation history of galaxies. However, the origin of their extended Ly-alpha…
3D Grid-Based Monte Carlo Code for Radiative Transfer through Raman and Rayleigh Scattering with Atomic Hydrogen -- STaRS
Seok-Jun Chang, Hee-Won Lee
Emission features formed through Raman scattering with atomic hydrogen provide unique and crucial information to probe the distribution and kinematics of a thick neutral region ill…
Line Formation of Raman-Scattered He II 4851 in an Expanding Spherical H I Shell in Young Planetary Nebulae
Bo-Eun Choi, Seok-Jun Chang, Ho-Gyu Lee +1
We investigate line formation of Raman-scattered He II at 4851 in an expanding neutral spherical shell that surrounds a point-like He II source located at the center. A new grid-ba…
Broad Wings around H and H in the Two S-Type Symbiotic Stars Z Andromedae and AG Draconis
Seok-Jun Chang, Hee-Won Lee, Ho-Gyu Lee +3
Symbiotic stars often exhibit broad wings around Balmer emission lines, whose origin is still controversial. We present the high resolution spectra of the S type symbiotic stars Z…
Escape of Resonantly Scattered Ly and H from Hot and Optically Thick Media
Seok-Jun Chang, Hee-Won Lee, Sang-Hyeon Ahn +4
We investigate the escape of Ly from emission nebulae with a significant population of excited hydrogen atoms in the level , rendering them optically thick in H. The tra…
Polarization of Rayleigh scattered Lyα in active galactic nuclei
Seok-Jun Chang, Hee-Won Lee, Yujin Yang
The unification scheme of active galactic nuclei (AGNs) invokes an optically thick molecular torus component hiding the broad emission line region. Assuming the presence of a thick…
A Monte Carlo Study of Flux Ratios of Raman Scattered O~VI Features at 6825 Å and 7082 Å in Symbiotic Stars
Young-Min Lee, Dae-Sub Lee, Seok-Jun Chang +2
Symbiotic stars are regarded as wide binary systems consisting of a hot white dwarf and a mass losing giant. They exhibit unique spectral features at 6825 Å and 7082 Å, which are f…
Formation of Raman Scattering Wings around H alpha, H beta and Pa alpha in Active Galactic Nuclei
Seok-Jun Chang, Jeong-Eun Heo, Francesco Di Mille +3
Powered by a supermassive black hole with an accretion disk, the spectra of active galactic nuclei (AGNs) are characterized by prominent emission lines including Balmer lines. The…