583 citations · 2.3k across the 42 of their papers we have counts for
42 papers
Near-infrared Integral-field Spectroscopy of the Wind Forming Region of CW Leo
Hyosun Kim, Youichi Ohyama, Ho-Gyu Lee +1
The circumstellar envelope of the carbon star CW Leo exhibited various unexpected changes in recent optical imaging observations. We have performed a follow-up observation using th…
The porous envelope and circumstellar wind matter of the closest carbon star, CW Leonis
Hyosun Kim, Ho-Gyu Lee, Youichi Ohyama +5
Recent abrupt changes of CW Leonis may indicate that we are witnessing the moment that the central carbon star is evolving off the Asymptotic Giant Branch (AGB) and entering into t…
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
Yi Xu, Masami Ouchi, Yuki Isobe +49
We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of and low stellar masses of $10^4-…
EMPRESS. XI. SDSS and JWST Search for Local and z~4-5 Extremely Metal-Poor Galaxies (EMPGs): Clustering and Chemical Properties of Local EMPGs
Moka Nishigaki, Masami Ouchi, Kimihiko Nakajima +16
We search for local extremely metal-poor galaxies (EMPGs), selecting photometric candidates by broadband color excess and machine-learning techniques with the SDSS photometric data…
Beyond Ultra-diffuse Galaxies. I. Mass--Size Outliers among the Satellites of Milky Way Analogs
Jiaxuan Li, Jenny E. Greene, Johnny P. Greco +10
Large diffuse galaxies are hard to find, but understanding the environments where they live, their numbers, and ultimately their origins, is of intense interest and importance for…
The Infrared Medium-deep Survey. IX. Discovery of Two New Quasars and Space Density down to mag
Yongjung Kim, Myungshin Im, Yiseul Jeon +17
We present the result of the Infrared Medium-deep Survey (IMS) quasar survey, using the combination of the IMS near-infrared images and the Canada-France-Hawaii Telescope…
EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy
Kimihiko Nakajima, Masami Ouchi, Yi Xu +13
We present optical-line gas metallicity diagnostics established by the combination of local SDSS galaxies and the largest compilation of extremely metal-poor galaxies (EMPGs) inclu…
EMPRESS. IX. Extremely Metal-Poor Galaxies are Very Gas-Rich Dispersion-Dominated Systems: Will JWST Witness Gaseous Turbulent High-z Primordial Galaxies?
Yuki Isobe, Masami Ouchi, Kimihiko Nakajima +49
We present kinematics of 6 local extremely metal-poor galaxies (EMPGs) with low metallicities () and low stellar masses (). Tak…
The Nature of Low Surface Brightness Galaxies in the Hyper Suprime-Cam Survey
Jenny E Greene, Johnny P. Greco, Andy D. Goulding +9
We present the statistical redshift distribution of a large sample of low surface brightness (LSB) galaxies identified in the first 200 deg of the Hyper Suprime-Cam Strategic S…
EMPRESS. VI. Outflows Investigated in Low-Mass Galaxies with : Weak Feedback in Low-Mass Galaxies?
Yi Xu, Masami Ouchi, Michael Rauch +10
We study emission line profiles of 21 nearby low-mass () galaxies in deep medium-high resolution spectra taken with Magellan/MagE. These low-mass galaxies ar…
EMPRESS. IV. Extremely Metal-Poor Galaxies (EMPGs) Including Very Low-Mass Primordial Systems with M*=10^4--10^5 M_sun and 2--3% (O/H)_sun: High (Fe/O) Suggestive of Metal Enrichment by Hypernovae/Pair-Instability Supernovae
Yuki Isobe, Masami Ouchi, Akihiro Suzuki +22
We present Keck/LRIS follow-up spectroscopy for 13 photometric candidates of extremely metal poor galaxies (EMPGs) selected by a machine-learning technique applied to the deep (~26…
Multi-epoch Optical Images of IRC+10216 Tell About the Central Star And the Adjacent Environment
Hyosun Kim, Ho-Gyu Lee, Youichi Ohyama +5
Six images of IRC+10216 taken by the Hubble Space Telescope at three epochs in 2001, 2011, and 2016 are compared in the rest frame of the central carbon star. An accurate astrometr…
Dual AGN candidates with double-peaked [O III] lines matching that of confirmed dual AGNs
D. -C. Kim, Ilsang Yoon, A. S. Evans +3
We have performed a spectral decomposition to search for dual active galactic nuclei (DAGNs) in the Sloan Digital Sky Survey (SDSS) quasars with . Potential DAGN candidates…
The Infrared Medium-deep Survey. VIII. Quasar Luminosity Function at
Yongjung Kim, Myungshin Im, Yiseul Jeon +27
Faint quasars with mag are known to be the potentially important contributors to the ultraviolet ionizing background in the post-reionization era. Howeve…
EMPRESS. II. Highly Fe-Enriched Metal-poor Galaxies with (Fe/O) and (O/H) : Possible Traces of Super Massive () Stars in Early Galaxies
Takashi Kojima, Masami Ouchi, Michael Rauch +18
We present element abundance ratios and ionizing radiation of local young low-mass (~ M_sun) extremely metal poor galaxies (EMPGs) with a 2% solar oxygen abundance (O/H)_su…
EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal Poor Galaxies (EMPGs): Are EMPGs Local Analogs of High- Young Galaxies?
Yuki Isobe, Masami Ouchi, Takashi Kojima +16
We present the morphology and stellar population of 27 extremely metal poor galaxies (EMPGs) at with metallicities of 0.01--0.1 Z. We conduct multi-component sur…
The Infrared Medium-deep Survey. \Romannum{7}. Faint Quasars at in the ELAIS-N1 Field
Suhyun Shin, Myungshin Im, Yongjung Kim +26
The intergalactic medium (IGM) at 5 to 6 is largely ionized, and yet the main source for the IGM ionization in the early universe is uncertain. Of the possible contributors…
Extremely Metal-Poor Representatives Explored by the Subaru Survey (EMPRESS). I. A Successful Machine Learning Selection of Metal-Poor Galaxies and the Discovery of a Galaxy with M*<10^6 M_sun and 0.016 Z_sun
Takashi Kojima, Masami Ouchi, Michael Rauch +18
We have initiated a new survey for local extremely metal-poor galaxies (EMPGs) with Subaru/Hyper Suprime-Cam (HSC) large-area (~500 deg^2) optical images reaching a 5 sigma limit o…
Dual black hole associated with obscured and unobscured AGN: CXO J101527.2+625911
D. -C. Kim, E. Momjian, Ilsang Yoon +6
We report the results of an investigation to determine the nature of the offset active galactic nucleus (AGN) found in the source CXO J101527.2+625911. Hubble Space Telescope and C…
The Neutral Hydrogen Properties of Galaxies in Gas-rich Groups
Robert Džudžar, Virginia Kilborn, Gerhardt Meurer +23
We present an analysis of the integrated neutral hydrogen (HI) properties for 27 galaxies within nine low mass, gas-rich, late-type dominated groups which we denote "Choirs". We fi…
Medium-resolution Optical and Near-Infrared Spectral Atlas of 16 2MASS-selected NIR-red Active Galactic Nuclei at
Dohyeong Kim, Myungshin Im, Gabriela Canalizo +6
We present medium-resolution spectra (--4000) at 0.4--1.0\,m and 0.7--2.5\,m of 16 active galactic nuclei (AGNs) selected with red color in the near-infrared (NI…
The Infrared Medium-deep Survey. VI. Discovery of Faint Quasars at with a Medium-band-based Approach
Yongjung Kim, Myungshin Im, Yiseul Jeon +25
The faint quasars with mag are known to hold the key to the determination of the ultraviolet emissivity for the cosmic re-ionization. But only a few have been identi…
JINGLE, a JCMT legacy survey of dust and gas for galaxy evolution studies: I. Survey overview and first results
Amelie Saintonge, Christine D. Wilson, Ting Xiao +88
JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium of galaxies in the local Universe. As part of the survey we perform 850um continuum…
A Study of Two Diffuse Dwarf Galaxies in the Field
Johnny P. Greco, Andy D. Goulding, Jenny E. Greene +4
We present optical long-slit spectroscopy and far-ultraviolet to near-infrared spectral energy distribution fitting of two diffuse dwarf galaxies, LSBG-285 and LSBG-750, which were…