Publications (34)
The 300-pc Scale ALMA View of [CI] -, CO =1-0, and 609 m Dust Continuum in A Luminous Infrared Galaxy
Toshiki Saito, Tomonari Michiyama, Daizhong Liu +7
We present high-quality ALMA Band 8 observations of the [CI] - line and 609 m dust continuum emission toward the nearby luminous infrared galaxy (LIRG) IRAS F1829…
The sign of active galactic nucleus quenching in a merger remnant with radio jets
Kohei Ichikawa, Junko Ueda, Megumi Shidatsu +2
We investigate optical, infrared, and radio active galactic nucleus (AGN) signs in the merger remnant Arp 187, which hosts luminous jets launched in the order of yr ago but…
The formation of the young massive cluster B1 in the Antennae galaxies (NGC 4038/NGC 4039) triggered by cloud-cloud collision
Kisetsu Tsuge, Kengo Tachihara, Yasuo Fukui +4
The Antennae Galaxies is one of the starbursts in major mergers. Tsuge et al. (2020) showed that the five giant molecular complexes in the Antennae Galaxies have signatures of clou…
A gravitationally unstable gas disk of a starburst galaxy 12 billion years ago
Ken-ichi Tadaki, Daisuke Iono, Min S. Yun +18
Submillimeter bright galaxies in the early Universe are vigorously forming stars at ~1000 times higher rate than the Milky Way. A large fraction of stars is formed in the central 1…
Discovery of Dying Active Galactic Nucleus in Arp 187: Experience of Drastic Luminosity Decline within years
Kohei Ichikawa, Junko Ueda, Hyun-Jin Bae +4
Arp 187 is one of the fading active galactic nuclei (AGN), whose AGN activity is currently decreasing in luminosity. We investigate the observational signatures of AGN in Arp 187,…
SOFIA/HAWC+ View of an Extremely Luminous Infrared Galaxy, WISE1013+6112
Yoshiki Toba, Wei-Hao Wang, Tohru Nagao +6
We present far-infrared (FIR) properties of an extremely luminous infrared galaxy (ELIRG) at = 3.703, WISE J101326.25+611220.1 (WISE1013+6112). This ELIRG is selecte…
Investigating the Relation between CO (3-2) and Far Infrared Luminosities for Nearby Merging Galaxies Using ASTE
Tomonari Michiyama, Daisuke Iono, Kouichiro Nakanishi +10
We present the new single dish CO (3-2) emission data obtained toward 19 early stage and 7 late stage nearby merging galaxies using the Atacama Submillimeter Telescope Experiment (…
Molecular Distribution in the Spiral Arm of M51
Yoshimasa Watanabe, Nami Sakai, Kazuo Sorai +2
Molecular line images of 13CO, C18O, CN, CS, CH3OH, and HNCO are obtained toward the spiral arm of M51 at a 7" times 6" resolution with the Combined Array for Research in Millimete…
Spatially resolved CO SLED of the Luminous Merger Remnant NGC 1614 with ALMA
Toshiki Saito, Daisuke Iono, Cong K. Xu +13
We present high-resolution (1".0) Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO (1-0) and CO (2- 1) rotational transitions toward the nearby IR-luminous me…
Spatially-resolved Dense Molecular Gas Excitation in the Nearby LIRG VV 114
Toshiki Saito, Daisuke Iono, Daniel Espada +14
We present high-resolution observations (0".2-1".5) of multiple dense gas tracers, HCN and HCO ( = 1-0, 3-2, and 4-3), HNC ( = 1-0), and CS ( = 7-6) lines, toward the…
NuSTAR Discovery of Dead Quasar Engine in Arp 187
Kohei Ichikawa, Taiki Kawamuro, Megumi Shidatsu +7
Recent active galactic nucleus (AGN) and quasar surveys have revealed a population showing rapid AGN luminosity variability by a factor of . Here we present the most drasti…
ALMA observations of HCN and HCO+ outflows in the merging galaxy NGC 3256
Tomonari Michiyama, Daisuke Iono, Kazimierz Sliwa +7
We report ~2" resolution Atacama Large Millimeter/submillimeter Array observations of the HCN(1-0), HCO+(1-0), CO(1-0), CO(2-1), and CO(3-2) lines towards the nearby merging double…
ALMA observations of the dense and shocked gas in the nuclear region of NGC 4038 (Antennae galaxies)
Junko Ueda, Yoshimasa Watanabe, Daisuke Iono +6
We present 1" (<100 pc) resolution maps of millimeter emission from five molecules-CN, HCN, HCO+, CH3OH, and HNCO-obtained towards NGC 4038, which is the northern galaxy of the mid…
Star formation traced by optical and millimeter hydrogen recombination lines and free-free emissions in the dusty merging galaxy NGC 3256 -- MUSE/VLT and ALMA synergy
Tomonari Michiyama, Daisuke Iono, Kouichiro Nakanishi +5
A galaxy-galaxy merger and the subsequent triggering of starburst activity are fundamental processes linked to the morphological transformation of galaxies and the evolution of sta…
CNO emission of an unlensed submillimeter galaxy at z=4.3
Ken-ichi Tadaki, Daisuke Iono, Bunyo Hatsukade +10
We present the results from ALMA observations of [NII]205 micron, [CII]158 micron, and [OII]88 micron lines in an unlensed submillimeter galaxy at z=4.3, COSMOS-AzTEC-1, hosting a…
The formation of young massive clusters triggered by cloud-cloud collisions in the Antennae Galaxies NGC 4038/NGC 4039
Kisetsu Tsuge, Yasuo Fukui, Kengo Tachihara +5
The formation mechanism of super star clusters (SSCs), a present-day analog of the ancient globulars, still remains elusive. The major merger, the Antennae galaxies is forming SSCs…
SMA Observations of Extended Emission in Interacting Galaxy NGC 3627
Charles J. Law, Qizhou Zhang, Luca Ricci +5
We present moderate () and high angular resolution () observations of emission toward nearby, interacting ga…
Cold Molecular Gas in Merger Remnants: I. Formation of Molecular Gas Disks
Junko Ueda, Daisuke Iono, Min S. Yun +11
We present < 1 kpc resolution CO imaging study of 37 optically-selected local merger remnants using new and archival interferometric maps obtained with ALMA, CARMA, SMA and PdBI. W…
Clumpy and Extended Starbursts in the Brightest Unlensed Submillimeter Galaxies
Daisuke Iono, Min S. Yun, Itziar Aretxaga +16
The central structure in three of the brightest unlensed z=3-4 submillimeter galaxies are investigated through 0.015" - 0.05" (120 -- 360~pc) 860 micron continuum images obtained u…
Spatially-resolved relation between [CI] - and CO (1-0) in Arp 220
Junko Ueda, Tomonari Michiyama, Daisuke Iono +2
We present 0."3 (114 pc) resolution maps of [CI] - (hereafter [CI] (1-0)) and CO (1-0) obtained toward Arp 220 with the Atacama Large Millimeter/…
Discovery of a [CI]-faint, CO-bright Galaxy: ALMA Observations of the Merging Galaxy NGC 6052
Tomonari Michiyama, Junko Ueda, Ken-ichi Tadaki +9
We report sensitive [\ion{C}{1}]~-- and CO~=4--3 observations of the nearby merging galaxy NGC 6052 using the Morita (Atacama Compact) Array of ALMA. We det…
Merger-induced Shocks in the Nearby LIRG VV 114 through Methanol Observations with ALMA
Toshiki Saito, Daisuke Iono, Daniel Espada +11
We report the detection of two CHOH lines (J = 2-1 and 3-2) between the progenitor's disks ("Overlap") of the mid-stage merging galaxy VV 114 obtained using…
Cold Molecular Gas in Merger Remnants. II. The properties of dense molecular gas
Junko Ueda, Daisuke Iono, Min S. Yun +7
We present the 3 mm wavelength spectra of 28 local galaxy merger remnants obtained with the Large Millimeter Telescope. Fifteen molecular lines from 13 different molecular species…
From Non-Detection to Detection: Atacama Compact Array Mosaic Observations of Faint Extended [C I] Emission in NGC 7679
Tomonari Michiyama, Toshiki Saito, Kouichiro Nakanishi +8
We report the detection of [C I] -- emission in the nearby galaxy NGC 7679 using the Atacama Compact Array (ACA) of the Atacama Large Millimeter/submillimeter Array (…
An ACA Survey of [CI] , CO , and Dust Continuum in Nearby U/LIRG
Tomonari Michiyama, Toshiki Saito, Ken-ichi Tadaki +11
We present the results of surveying [CI] , CO , and 630 m dust continuum emission for 36 nearby ultra/luminous infrared galaxies (U/LIRGs) using the…
ALMA Multi-line Observations of the IR-bright Merger VV 114
Toshiki Saito, Daisuke Iono, Min S. Yun +10
We present ALMA cycle 0 observations of the molecular gas and dust in the IR-bright mid-stage merger VV114 obtained at 160 - 800 pc resolution. The main aim of this study is to inv…
FIR-luminous [CII] emitters in the ALMA-SCUBA-2 COSMOS survey (AS2COSMOS): The nature of submillimeter galaxies in a 10 comoving Mpc-scale structure at z~4.6
Ikki Mitsuhashi, Yuichi Matsuda, Ian Smail +20
We report the discovery of a 10 comoving Mpc-scale structure traced by massive submillimeter galaxies (SMGs) at z~4.6. These galaxies are selected from an emission line search of A…
Improving ALMA's data processing effciency using a holistic approach
Theodoros Nakos, Harold Francke, Kouichiro Nakanishi +7
ALMA (Atacama Large Millimeter/submillimeter Array) is the world's largest ground-based facility for observations in the millimeter/submillimeter regime. One of ALMA's outstanding…
Spatially-resolved Radio-to-Far-infrared SED of the Luminous Merger Remnant NGC 1614 with ALMA and VLA
Toshiki Saito, Daisuke Iono, Cong K. Xu +9
We present the results of Atacama Large Millimeter/Submillimeter Array (ALMA) 108, 233, 352, and 691 GHz continuum observations and Very Large Array (VLA) 4.81 and 8.36 GHz observa…
Unveiling the physical properties and kinematics of molecular gas in the Antennae Galaxies (NGC 4038/9) through high resolution CO (J = 3-2) observations
Junko Ueda, Daisuke Iono, Glen Petitpas +12
We present a ~ 1" (100 pc) resolution 12CO (3-2) map of the nearby intermediate stage interacting galaxy pair NGC 4038/9 (the Antennae galaxies) obtained with the Submillimeter Arr…
Discovery of an extremely-luminous dust-obscured galaxy observed with SDSS, WISE, JCMT, and SMA
Yoshiki Toba, Junko Ueda, Chen-Fatt Lim +5
We present the discovery of an extremely-luminous dust-obscured galaxy (DOG) at = 3.703, WISE J101326.25+611220.1. This DOG is selected as a candidate of extremely-l…
Multi-wavelength and Multi-CO View of The Minor Merger Driven Star Formation in the Nearby LIRG NGC 3110
Yuka Kawana, Toshiki Saito, Sachiko K. Okumura +12
We present Atacama Large Millimeter/submillimeter Array observations of multiple CO(1-0), CO(1-0), and CO(1-0) lines and 2.9 mm and 1.3 mm continuum emission toward t…
Cold Molecular Gas Along the Merger Sequence in Local Luminous Infrared Galaxies
Takuji Yamashita, Shinya Komugi, Hideo Matsuhara +7
We present an initial result from the 12CO (J=1-0) survey of 79 galaxies in 62 local luminous and ultra-luminous infrared galaxy (LIRG and ULIRG) systems obtained using the 45 m te…
A non-corotating gas component in an extreme starburst at z=4.3
Ken-ichi Tadaki, Daisuke Iono, Min S. Yun +8
We report the detection of a non-corotating gas component in a bright unlensed submillimeter galaxy at z=4.3, COSMOS-AzTEC-1, hosting a compact starburst. ALMA 0.17 and 0.09 arcsec…