Ho-Gyu Lee

Constructing a Mock Galaxy Catalog for the All-sky Spectroscopic Survey of Nearby Galaxies (A-SPEC) Using the Machine-assisted Semi-Simulation Model

Dongkok Kim, Yongseok Jo, Ho Seong Hwang, Ji-hoon Kim et autres

Abstract We present a methodology for constructing a mock galaxy catalog for the All-sky SPECtroscopic survey of nearby galaxies (A-SPEC) using the Machine-assisted Semi-Simulation Model. The model is trained on the cosmological magnetohydrodynamical simulation IllustrisTNG to predict baryonic properties of subhalos from …

kr, us, ye (code pays fourni par la source)

Control software development for A/K-SPEC: guiding, focusing, acquisition, and atmospheric dispersion correction systems

Mingyeong Yang, Sang-Hyun Chun, Yongmin Yoon, Dongkok Kim et autres

The All-Sky Spectroscopic Survey (A-SPEC) is a large-volume, all-sky, multiobject spectroscopic survey targeting galaxies with Ks ⪅ 13.75 and stellar objects, with the goal of constructing a comprehensive dataset for studies of stellar and galaxy evolution and cosmology. The survey instruments are …

kr, us (code pays fourni par la source)

Multi-color light curves of Ex Lup

Mu-Tian Wang, Gregory J. Herczeg, Hui-Gen Liu, Min Fang et autres

cn, au, ca, kr, us, de, be, Afrique du Sud (code pays fourni par la source)

EPISODE. II. Variability in the CO and H 2 O Rovibrational Absorption Lines in a Periodically Variable Protostar EC 53

Seokho Lee, Jeong‐Eun Lee, Chul-Hwan Kim, Jaeyeong Kim et autres

Abstract We present two-epoch JWST NIRSpec and MIRI observations of the young protostar EC 53 (V371 Ser), a periodically variable source with well-characterized quiescent and burst phases. The spectra in both epochs show absorption in the CO overtone (∼2.3 μ m) and …

kr, cn, ca, jp, us, nl (code pays fourni par la source)

SPHEREx Widefield Infrared Spectral Mapping of Interstellar Ices and Polycyclic Aromatic Hydrocarbons

Joseph L. Hora, J. W. Noh, Gary J. Melnick, Brandon S. Hensley et autres

Abstract We present some of the first infrared spectral maps acquired by SPHEREx. These maps, which to our knowledge are the largest of their type ever compiled in the near-infrared, reveal multiple strong lines due to interstellar ices and polycyclic aromatic hydrocarbons …

us, kr, tw (code pays fourni par la source)

Near-infrared [P II] and [Fe II] line mapping of Galactic supernova remnants

Takuma Kokusho, Yuki Katsurada, Yong‐Hyun Lee, Bon‐Chul Koo et autres

Phosphorus (P) is one of the key ingredients for life, yet its origins in galaxies remain poorly understood. In order to investigate the production of P by supernovae, we performed near-infrared (IR) [P II] and [Fe II] line mapping of 26 Galactic …

The SPHEREx Satellite Mission

J. J. Bock, Asad M. Aboobaker, Joseph Adamo, Rachel Akeson et autres

SPHEREx, a NASA explorer satellite launched on 11 March 2025, is carrying out the first all-sky near-infrared spectral survey. The satellite observes in 102 spectral bands from 0.75 to 5.0 um with a resolving power ranging from 35 to 130 in 6.2 …

fr (code pays fourni par la source)

Analysis of the Effects of Surface Contamination and Changes in Thermal Insulation Performance Considering Long-term Application of Thermal Insulation Fabrics to Railway Sites

Donghoon Kang, Juyeop Park, Ho-Gyu Lee

기후 변화로 인한 하절기 폭염은 철도 레일의 열팽창을 유발하여 장출과 같은 심각한 안전 문제를 야기한다. 본 연구는 기존의 비효율적인 온도 관리 기술을 대체할 차열직물의 장기적인 현장 적용성을 검증하고자 한다. 이를 위해, 영업 운행 중인 철도 레일에 1년간 노출된 차열직물 시편을 대상으로 환경 …

“Oh FUors, Where Art Thou?”: A Search for Long-lasting Young Stellar Object Outbursts Hiding in Infrared Surveys

Carlos Contreras Peña, Jeong‐Eun Lee, Ho-Gyu Lee, Gregory J. Herczeg et autres

Abstract Long-lasting episodes of high accretion can strongly impact stellar and planetary formation. However, the universality of these events during the formation of young stellar objects (YSOs) is still under debate. Accurate statistics of strong outbursts (FUors) are necessary to understand the …

"Oh FUors where art thou": A search for long-lasting YSO outbursts hiding in infrared surveys

Carlos Contreras Peña, Jeong‐Eun Lee, Ho-Gyu Lee, Gregory J. Herczeg et autres

Long-lasting episodes of high accretion can strongly impact stellar and planetary formation. However, the universality of these events during the formation of young stellar objects (YSOs) is still under debate. Accurate statistics of strong outbursts (FUors), are necessary to understand the role …

Near-infrared [P II ] and [Fe II ] Emission-line Study of Supernova Remnants in the Magellanic Clouds

Rommy L. S. E. Aliste Castillo, Yong‐Hyun Lee, Takuma Kokusho, Ho-Gyu Lee et autres

Abstract We report findings from near-infrared imaging observations of 17 young and middle-aged supernova remnants (SNRs) in the Magellanic Clouds to examine the impact of SNR shocks on dust destruction and the possible detection of supernova ejecta. We have analyzed [P II] …

High-resolution BOES Spectroscopy of Raman-scattered He ii λ6545 in Young Planetary Nebulae

J. Lim, Seok-Jun Chang, Jaejin Shin, Hee‐Won Lee et autres

Abstract 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 during the asymptotic giant branch phase of stellar evolution. Far-UV He ii λ1025 line photons …