34 citations · 266 across the 21 of their papers we have counts for
21 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…
Search for Slow Bars in Two Barred Galaxies with Nuclear Structures: NGC 6951 and NGC 7716
Yun Hee Lee, Ho Seong Hwang, Virginia Cuomo +9
We investigate two barred galaxies with nuclear structures, NGC 6951 and NGC 7716, to examine whether they host slow bars. Using Gemini/GMOS long-slit spectroscopy, we calculate th…
Near-Infrared Spectroscopy with IGRINS-2 for Studying Multiple Stellar Populations in Globular Clusters
Dongwook Lim, Young-Wook Lee, Sol Yun +53
Recent advancements in near-infrared (NIR) spectroscopy have opened new opportunities for studying multiple stellar populations in globular clusters (GCs), particularly for newly d…
Initial Mass Functions of Young Stellar Clusters from the Gemini Spectroscopic Survey of Nearby Galaxies I. Young Massive Clusters in the Antennae galaxies
Jae-Rim Koo, Hyun-Jeong Kim, Beomdu Lim
The stellar initial mass function (IMF) is a key parameter to understand the star formation process and the integrated properties of stellar populations in remote galaxies. We pres…
Supernova Ejecta with Crystalline Silicate Dust in the Supernova Remnant MSH 15-52
Hyun-Jeong Kim, Bon-Chul Koo, Takashi Onaka
IRAS 15099-5856 in the young supernova remnant (SNR) MSH 15-52 is the first and only SNR-associated object with crystalline silicate dust detected so far, although its nature and t…
Triple spiral arms of a triple protostar system imaged in molecular lines
Jeong-Eun Lee, Tomoaki Matsumoto, Hyun-Jeong Kim +9
Most stars form in multiple star systems. For a better understanding of their formation processes, it is important to resolve the individual protostellar components and the surroun…
Effects of Winds on the Optical Properties of Type Ib and Ic Supernova Progenitors
Moo-Keon Jung, Sung-Chul Yoon, Hyun-Jeong Kim
We investigate the effects of winds on the observational properties of Type Ib and Ic supernova (SN Ib/Ic) progenitors using spectral models constructed with the non-LTE stellar at…
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…
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…
A Parsec-scale Bipolar H Outflow in the Massive Star Forming Infrared Dark Cloud Core MSXDC G053.11+00.05 MM1
Hyun-Jeong Kim, Bon-Chul Koo, Tae-Soo Pyo +1
We present a parsec-scale molecular hydrogen (H 1-0 S(1) at 2.12~\micron) outflow discovered from the UKIRT Widefield Infrared Survey for H. The outflow is located in the i…
Infrared Supernova Remnants and their Infrared to X-ray Flux Ratios
Bon-Chul Koo, Jae-Joon Lee, Il-Gyo Jeong +2
Recent high-resolution infrared space missions have revealed supernova remnants (SNRs) of diverse morphology in infrared (IR) dust emission that is often very different from their…
Observational Properties of Type Ib/c Supernova Progenitors in Binary Systems
Hyun-Jeong Kim, Sung-Chul Yoon, Bon-Chul Koo
In several recent observational studies on Type Ib/c supernovae (SNe Ib/c), the inferred ejecta masses have a peak value of 2.0 -- 4.0 , in favor of the binary scenario fo…
Star Formation Activity in the Long, Filamentary Infrared Dark Cloud G53.2
Hyun-Jeong Kim, Bon-Chul Koo, Christopher J. Davis
We present star formation activity in the infrared dark cloud (IRDC) G53.2, a remarkable IRDC located at Galactic coordinates based on the c…
[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…
[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 Spectroscopy of Infrared-Excess Stellar Objects in the Young Supernova Remnant G54.1+0.3
Hyun-Jeong Kim, Bon-Chul Koo, Dae-Sik Moon
We present the results of broadband near-infrared spectroscopic observations of the recently discovered mysterious stellar objects in the young supernova remnant G54.1+0.3. These o…
Wide Integral-Field Infrared Spectroscopy of the Bright [Fe II] Shell in the Young Supernova Remnant G11.2-0.3
Ho-Gyu Lee, Dae-Sik Moon, Bon-Chul Koo +9
We present the results of wide integral-field near-infrared (1.0-1.8 um) spectroscopic observations of the southeastern shell of the young core-collapse supernova remnant (SNR) G11…
IRAS 15099-5856: Remarkable Mid-Infrared Source with Prominent Crystalline Silicate Emission Embedded in the Supernova Remnant MSH15-52
Bon-Chul Koo, Christopher F. McKee, Kyung-Won Suh +18
We report new mid-infrared observations of the remarkable object IRAS 15099-5856 using the space telescopes AKARI and Spitzer, which demonstrate the presence of prominent crystalli…
Circumstellar molecular composition of the oxygen-rich AGB star IK Tau: I. Observations and LTE chemical abundance analysis
Hyunjoo Kim, Friedrich Wyrowski, Karl M. Menten +1
The aim of this paper is to study the molecular composition in the circumstellar envelope around the oxygen-rich star IK Tau. We observed IK Tau in several (sub)millimeter bands us…