82 citations · 427 across the 20 of their papers we have counts for
20 papers
A Comparative Study of the Supernova Remnant Cassiopeia A from 2013--2020 Deep [Fe II]+[Si I] Images
Seung-Hoon Jung, Bon-Chul Koo, Yong-Hyun Lee +2
We present a comparative analysis of supernova remnant Cassiopeia A based on two deep, narrow-band images covering the [Fe II] 1.644um + [Si I] 1.645um lines obtained in 2013 and 2…
Extended Ionized Fe Objects in the UWIFE Survey
Kim Yesol, Koo Bon-Chul, Pyo Tae-Soo +7
We explore systematically the shocked gas in the first Galactic quadrant of the Milky Way using the United Kingdom Infrared Telescope (UKIRT) Wide-field Infrared Survey for Fe+ (UW…
Near-infrared [P II] and [Fe II] line mapping of Galactic supernova remnants
Takuma Kokusho, Yuki Katsurada, Yong-Hyun Lee +7
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 Spectroscopy of Dense Ejecta Knots in the Outer Eastern Area of the Cassiopeia A Supernova Remnant
Bon-Chul Koo, Yong-Hyun Lee, Jae-Joon Lee +1
The Cassiopeia A supernova remnant has a complex structure, manifesting the multidimensional nature of core-collapse supernova explosions. To further understand this, we carried ou…
Unusually high HCO+/CO ratios in and outside supernova remnant W49B
Ping Zhou, Gao-Yuan Zhang, Xin Zhou +10
Galactic supernova remnants (SNRs) and their environments provide the nearest laboratories to study SN feedback. We performed molecular observations toward SNR W49B, the most lumin…
High-resolution Near-infrared Spectroscopic Study of Galactic Supernova Remnants. I. Kinematic Distances
Yong-Hyun Lee, Bon-Chul Koo, Jae-Joon Lee
We have carried out high-resolution near-infrared spectroscopic observations toward 16 Galactic supernova remnants (SNRs) showing strong H emission features. A dozen bright H…
Detection of Pristine Circumstellar Material of the Cassiopeia A Supernova
Bon-Chul Koo, Hyun-Jeong Kim, Heeyoung Oh +4
Cassiopeia A is a nearby young supernova remnant that provides a unique laboratory for the study of core-collapse supernova explosions. Cassiopeia A is known to be a Type IIb super…
Near-infrared [Fe II] and H Emission-line Study of Galactic Supernova Remnants in the First Quadrant
Yong-Hyun Lee, Bon-Chul Koo, Jae-Joon Lee +2
We report the detection of near-infrared (NIR) [Fe II] (1.644 m) and H 1-0 S(1) (2.122 m) line features associated with Galactic supernova remnants (SNRs) in the first…
A Deep Near-Infrared [Fe II]+[Si I] Emission Line Image of the Supernova Remnant Cassiopeia A
Bon-Chul Koo, Hyun-Jeong Kim, Yong-Hyun Lee +4
We present a long-exposure (~10 hr) image of the supernova (SN) remnant Cassiopeia A (Cas A) obtained with the UKIRT 3.8-m telescope using a narrow band filter centered at 1.644 um…
High-resolution near-IR Spectral mapping with H and [Fe II] lines of Multiple Outflows around LkH 234
Heeyoung Oh, Tae-Soo Pyo, Bon-Chul Koo +11
We present a high-resolution, near-IR spectroscopic study of multiple outflows in the LkH 234 star formation region using the Immersion GRating INfrared Spectrometer (IGRINS). S…
Near-Infrared Knots and Dense Fe Ejecta in the Cassiopeia A Supernova Remnant
Yong-Hyun Lee, Bon-Chul Koo, Dae-Sik Moon +2
We report the results of broadband (0.95--2.46 m) near-infrared spectroscopic observations of the Cassiopeia A supernova remnant. Using a clump-finding algorithm in two-dimensio…
Near-infrared Extinction due to Cool Supernova Dust in Cassiopeia A
Yong-Hyun Lee, Bon-Chul Koo, Dae-Sik Moon +1
We present the results of extinction measurements toward the main ejecta shell of the Cassiopeia A supernova (SN) remnant using the flux ratios between the two near-infrared (NIR)…
Near-Infrared Spectroscopy of Young Galactic Supernova Remnants
Bon-Chul Koo, Yong-Hyun Lee
Young Galactic supernova remnants (SNRs) are where we can observe closely the supernova (SN) ejecta and its interaction with circumstellar/interstellar medium. Therefore, they prov…
[Fe II] 1.64 um Imaging Observations of the Outflow Features around Ultracompact H II Regions in the 1st Galactic Quadrant
Jong-Ho Shinn, Kee-Tae Kim, Jae-Joon Lee +7
We present [Fe II] 1.644 um features around ultracompact H II regions (UCHIIs) found on a quest for the "footprint" outflow features of UCHIIs---the feature produced by the outflow…
UKIRT Widefield Infrared Survey for Fe
Jae-Joon Lee, Bon-Chul Koo, Yong-Hyun Lee +17
The United Kingdom Infrared Telescope (UKIRT) Widefield Infrared Survey for Fe (UWIFE) is a 180 deg imaging survey of the first Galactic quadrant (7 < l < 62$^{\c…
Phosphorus in the Young Supernova Remnant Cassiopeia A
Bon-Chul Koo, Yong-Hyun Lee, Dae-Sik Moon +2
Phosphorus (P), which is essential for life, is thought to be synthesized in massive stars and dispersed into interstellar space when these stars explode as supernovae (SNe)…
[Fe II] 1.64 um Features of Jets and Outflows from Young Stellar Objects in the Carina Nebula
Jong-Ho Shinn, Tae-Soo Pyo, Jae-Joon Lee +11
We present [Fe II] 1.64 μm imaging observations for jets and outflows from young stellar objects (YSOs) over the northern part (~ 24'x45') of the Carina Nebula, a massive star form…
Near-infrared H2 and Continuum Survey of Extended Green Objects. II. Complete Census for the Northern Galactic Plane
Hsu-Tai Lee, Wei-Ting Laio, Dirk Froebrich +7
We discuss 94 Extended Green Objects (EGOs) in the northern Galactic plane cataloged by Cyganowski et al, based on near-infrared narrowband H2 (2.122 μm and continuum observations…
Near-Infrared H2 and Continuum Survey of Extended Green Objects
Hsu-Tai Lee, Michihiro Takami, Hao-Yuan Duan +5
The Spitzer GLIMPSE survey has revealed a number of "Extended Green Objects" (EGOs) which display extended emission at 4.5 micron. These EGOs are potential candidates for high mass…
UWISH2 -- The UKIRT Widefield Infrared Survey for H2
D., Froebrich, C. J. +56
We present the goals and preliminary results of an unbiased, near-infrared, narrow-band imaging survey of the First Galactic Quadrant (10deg<l<65deg ; -1.3deg<b<+1.3deg). This area…