Kitami Institute of Technology

output

19992026

most citedSecond Data Release of the Hyper Suprime-Cam Subaru Strategic Program

514 citations

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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36 papers · 1 filter

astro-ph.GA2025★ 2 cited

The LMT 2 millimeter receiver system (B4R). II. Science demonstration observations toward Orion-KL/OMC-1

Teppei Yonetsu, Ryohei Kawabe, Yuki Yoshimura +26

We present the results of mapping and single-point spectral scans toward Orion-KL/OMC-1 performed as science demonstrations of a 2 mm SIS receiver, the Band 4 Receiver (B4R), insta…

astro-ph.GA2023★ 4 cited

Cosmic-ray-driven enhancement of the C $^{0}$ /CO abundance ratio in W51C

Mitsuyoshi Yamagishi, Kenji Furuya, Hidetoshi Sano +5

We examine spatial variations of the C $^{0}$ /CO abundance ratio ( $X_{C/CO}$ ) in the vicinity of the $γ$ -ray supernova remnant W51C, based on [CI] ( $^{3} P_{1}$ - $^{3} P_{0}$ ), $^{12}$ C…

astro-ph.GA2023★ 14 cited

An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. II. CO Cloud Catalog

Takahiro Ohno, Kazuki Tokuda, Ayu Konishi +16

The nature of molecular clouds and their statistical behavior in subsolar metallicity environments are not fully explored yet. We analyzed data from an unbiased CO( $J$ = 2-1) surve…

astro-ph.GA2023★ 12 cited

Updated measurements of [O III] 88 $μ$ m, [C II] 158 $μ$ m, and Dust Continuum Emission from a z=7.2 Galaxy

Yi W. Ren, Yoshinobu Fudamoto, Akio K. Inoue +13

We present updated measurements of the [O III] 88 $μ$ m, [C II] 158 $μ$ m, and dust continuum emission from a star-forming galaxy at $z = 7.212$ , SXDF-NB1006-2, by utilizing Atacama La…

astro-ph.GA2023★ 8 cited

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 $0.015 - 0.195 Z_{⊙}$ and low stellar masses of $10^4-…

astro-ph.GA2022★ 6 cited

ALMA Observations for CO Emission from Luminous Lyman-break Galaxies at $z = 6.0293$ - $6.2037$

Yoshiaki Ono, Seiji Fujimoto, Yuichi Harikane +14

We present our new Atacama Large Millimeter/submillimeter Array (ALMA) observations targeting CO(6-5) emission from three luminous Lyman break galaxies (LBGs) at $z_{\rm spec} = 6.…

astro-ph.GA2022★ 81 cited

Morphologies of Galaxies at $z ≳ 9$ Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at $z \sim 12$

Yoshiaki Ono, Yuichi Harikane, Masami Ouchi +8

We present morphologies of galaxies at $z ≳ 9$ resolved by JWST/NIRCam $2$ - $5 μ$ m imaging. Our sample consists of $22$ galaxy candidates identified by stringent dropout and ph…

astro-ph.GA2022★ 12 cited

CHORUS IV: Mapping the Spatially Inhomogeneous Cosmic Reionization with Subaru HSC

Takehiro Yoshioka, Nobunari Kashikawa, Akio K. Inoue +11

The spatial inhomogeneity is one of the important features for understanding the reionization process; however, it has not yet been fully quantified. To map this inhomogeneous dist…

astro-ph.GA2021★ 87 cited

Hyper Suprime-Cam Subaru Strategic Program: A Mass-Dependent Slope of the Galaxy Size-Mass Relation at $z < 1$

Lalitwadee Kawinwanichakij, John D. Silverman, Xuheng Ding +11

We present the galaxy size-mass ( $R_{e} - M_{*}$ ) distributions using a stellar-mass complete sample of $\sim 1.5$ million galaxies, covering $\sim 100$ deg $^{2}$ , with $\log(M_{\ast}…

astro-ph.GA2021★ 15 cited

SILVERRUSH. XI. Intensity Mapping for Lya Emission Extending over $100 - 1000$ comoving kpc around $z \sim 2 - 7$ LAEs with Subaru HSC-SSP and CHORUS Data

Shotaro Kikuchihara, Yuichi Harikane, Masami Ouchi +14

We conduct intensity mapping to probe for extended diffuse Ly $α$ emission around Ly $α$ emitters (LAEs) at $z \sim 2 - 7$ , exploiting very deep ( $\sim 26$ mag at $5 σ$ ) and large-area ($\…

astro-ph.GA2021★ 23 cited

An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. I. Overview: CO Cloud Distributions

Kazuki Tokuda, Hiroshi Kondo, Takahiro Ohno +15

We have analyzed the data from a large-scale CO survey toward the northern region of the Small Magellanic Cloud (SMC) obtained with the Atacama Compact Array (ACA) stand-alone mode…

astro-ph.GA2021★ 2 cited

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XIV. A Candidate Type-II Quasar at z=6.1292

Masafusa Onoue, Yoshiki Matsuoka, Nobunari Kashikawa +13

We present deep Keck/MOSFIRE near-infrared spectroscopy of a strong Lyman alpha emitting source at z=6.1292, HSC J142331.71-001809.1, which was discovered by the SHELLQS program fr…

astro-ph.GA2021★ 20 cited

Galaxy Morphologies Revealed with Subaru HSC and Super-Resolution Techniques I: Major Merger Fractions of L_UV~3-15 L_UV* Dropout Galaxies at z~4-7

Takatoshi Shibuya, Noriaki Miura, Kenji Iwadate +5

We perform a super-resolution analysis of the Subaru Hyper Suprime-Cam (HSC) images to estimate the major merger fractions of z~4-7 dropout galaxies at the bright end of galaxy UV…

astro-ph.GA2021★ 25 cited

SILVERRUSH X: Machine Learning-Aided Selection of $9318$ LAEs at $z = 2.2$ , $3.3$ , $4.9$ , $5.7$ , $6.6$ , and $7.0$ from the HSC SSP and CHORUS Survey Data

Yoshiaki Ono, Ryohei Itoh, Takatoshi Shibuya +25

We present a new catalog of $9318$ Ly $α$ emitter (LAE) candidates at $z = 2.2$ , $3.3$ , $4.9$ , $5.7$ , $6.6$ , and $7.0$ that are photometrically selected by the SILVERRUSH program wi…

astro-ph.GA2021★ 5 cited

ALMA view of the $ρ$ Ophiuchi A PDR with a 360-au beam: the [CI] emission originates from the plane-parallel PDR and extended gas

Mitsuyoshi Yamagishi, Yoshito Shimajiri, Kazuki Tokuda +5

We present the results of data analysis of the [CI] ( $^{3} P_{1}$ - $^{3} P_{0}$ ) emission from the $ρ$ Ophiuchi A photon-dominated region (PDR) obtained in the ALMA ACA stand-alone mo…

astro-ph.GA2020★ 201 cited

Observations of the Lyman- $α$ Universe

Masami Ouchi, Yoshiaki Ono, Takatoshi Shibuya

Hydrogen Lyman- $α$ (Ly $α$ ) emission has been one of the major observational probes for the high redshift universe, since the first discoveries of high- $z$ Ly $α$ emitting galaxies i…

astro-ph.GA2020★ 18 cited

CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview

Akio K. Inoue, Satoshi Yamanaka, Masami Ouchi +28

To determine the dominant sources for cosmic reionization, the evolution history of the global ionizing fraction, and the topology of the ionized regions, we have conducted a deep…

astro-ph.GA2020★ 30 cited

Broad-band selection, spectroscopic identification, and physical properties of a population of extreme emission line galaxies at 3<z<3.7

Masato Onodera, Rhythm Shimakawa, Tomoko L. Suzuki +7

We present the selection, spectroscopic identification, and physical properties of extreme emission line galaxies (EELGs) at $3 < z < 3.7$ aiming at studying physical properties of an…

astro-ph.GA2020★ 27 cited

The UV Luminosity Function of Protocluster Galaxies at $z \sim 4$ : the Bright-end Excess and the Enhanced Star Formation Rate Density

Kei Ito, Nobunari Kashikawa, Jun Toshikawa +12

We report the rest-frame ultraviolet luminosity function of $g$ -dropout galaxies in 177 protocluster candidates (PC UVLF) at $z \sim 4$ selected in the Hyper Suprime-Cam Subaru Strat…

astro-ph.GA2020★ 45 cited

EMPRESS. II. Highly Fe-Enriched Metal-poor Galaxies with $\sim 1.0$ (Fe/O) $_{⊙}$ and $0.02$ (O/H) $_{⊙}$ : Possible Traces of Super Massive ( $> 300 M_{⊙}$ ) Stars in Early Galaxies

Takashi Kojima, Masami Ouchi, Michael Rauch +18

We present element abundance ratios and ionizing radiation of local young low-mass (~ $1 0^{6}$ M_sun) extremely metal poor galaxies (EMPGs) with a 2% solar oxygen abundance (O/H)_su…

astro-ph.GA2020★ 20 cited

EMPRESS. III. Morphology, Stellar Population, and Dynamics of Extremely Metal Poor Galaxies (EMPGs): Are EMPGs Local Analogs of High- $z$ Young Galaxies?

Yuki Isobe, Masami Ouchi, Takashi Kojima +16

We present the morphology and stellar population of 27 extremely metal poor galaxies (EMPGs) at $z \sim 0$ with metallicities of 0.01--0.1 Z $_{⊙}$ . We conduct multi-component sur…

astro-ph.GA2020★ 158 cited

ALMA uncovers the [CII] emission and warm dust continuum in a z = 8.31 Lyman break galaxy

Tom J. L. C. Bakx, Yoichi Tamura, Takuya Hashimoto +15

We report on the detection of the [CII] 157.7 $μ$ m emission from the Lyman break galaxy (LBG) MACS0416_Y1 at z = 8.3113, by using the Atacama Large Millimeter/submillimeter Array (…

astro-ph.GA2019★ 188 cited

Large Population of ALMA Galaxies at z>6 with Very High [OIII]88um to [CII]158um Flux Ratios: Evidence of Extremely High Ionization Parameter or PDR Deficit?

Yuichi Harikane, Masami Ouchi, Akio K. Inoue +20

We present our new ALMA observations targeting [OIII]88um, [CII]158um, [NII]122um, and dust continuum emission for three Lyman break galaxies at z=6.0293-6.2037 identified in the S…

astro-ph.GA2019★ 77 cited

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…

The LMT 2 millimeter receiver system (B4R). II. Science demonstration observations toward Orion-KL/OMC-1

Cosmic-ray-driven enhancement of the C0/CO abundance ratio in W51C

An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. II. CO Cloud Catalog

Updated measurements of [O III] 88 μm, [C II] 158 μm, and Dust Continuum Emission from a z=7.2 Galaxy

EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies

ALMA Observations for CO Emission from Luminous Lyman-break Galaxies at z=6.0293-6.2037

Morphologies of Galaxies at z≳9 Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at z∼12