148 citations · 1.1k across the 35 of their papers we have counts for
35 papers
A New Framework for Multi-Line Analysis Combined Kernel PCA and Kernel SHAP: A Case of NGC 1068 ALMA Band 3 Data
Hiroma Okubo, Tsutomu T. Takeuchi, Shotaro Akaho +7
We present a new framework for multi-line analysis that combines kernel principal component analysis (Kernel PCA), an unsupervised machine-learning method, and Kernel SHapley Addit…
Detailed analysis of multi-line molecular distributions in the Seyfert galaxy NGC 1068: Possible effect of the AGN outflow to the starburst ring
Hiroma Okubo, Toshiki Saito, Shuro Takano +5
We apply principal component analysis (PCA) to the integrated intensity maps of 13 molecular lines of the nearby type-2 Seyfert galaxy NGC 1068 obtained by Atacama Large Millimeter…
Measuring 60-pc-scale Star Formation Rate of the Nearby Seyfert Galaxy NGC 1068 with ALMA, HST, VLT/MUSE, and VLA
Yuzuki Nagashima, Toshiki Saito, Soh Ikarashi +7
Star formation rate (SFR) is a fundamental parameter for describing galaxies and inferring their evolutionary course. HII regions yield the best measure of instantaneous SFR in gal…
The ALCHEMI atlas: principal component analysis reveals starburst evolution in NGC 253
Nanase Harada, David S. Meier, Sergio Martín +24
Molecular lines are powerful diagnostics of the physical and chemical properties of the interstellar medium (ISM). These ISM properties, which affect future star formation, are exp…
Molecular Abundance of the Circumnuclear Region Surrounding an Active Galactic Nucleus in NGC 1068 based on Imaging Line Survey in the 3-mm Band with ALMA
Taku Nakajima, Shuro Takano, Tomoka Tosaki +9
We present an imaging molecular line survey in the 3-mm band (85-114 GHz) focused on one of the nearest galaxies with an active galactic nucleus (AGN), NGC 1068, based on observati…
AGN-driven Cold Gas Outflow of NGC 1068 Characterized by Dissociation-Sensitive Molecules
Toshiki Saito, Shuro Takano, Nanase Harada +11
Recent developments in (sub-)millimeter facilities have drastically changed the amount of information obtained from extragalactic spectral scans. In this paper, we present a featur…
The Kiloparsec-scale Neutral Atomic Carbon Outflow in the Nearby Type-2 Seyfert Galaxy NGC 1068: Evidence for Negative AGN Feedback
Toshiki Saito, Shuro Takano, Nanase Harada +13
Active galactic nucleus (AGN) feedback is postulated as a key mechanism for regulating star formation within galaxies. Studying the physical properties of the outflowing gas from A…
ALMA Observations of Multiple-CO and C Lines Toward the Active Galactic Nucleus of NGC 7469: X-Ray-dominated Region Caught in the Act
Takuma Izumi, Dieu D. Nguyen, Masatoshi Imanishi +15
We used the Atacama Large Millimeter/submillimeter Array (ALMA) to map CO( = 1-0), CO( = 2-1), CO( = 3-2), CO( = 2-1), and [CI](-$^3P…
ALMA observations of CS in NGC 1068: chemistry and excitation
M. Scourfield, S. Viti, S. Garcia-Burillo +14
We present results from Atacama Large Millimeter/submillimeter Array (ALMA) observations of CS from the nearby galaxy NGC 1068 ( Mpc). This Seyfert 2 barred galaxy possesse…
Observations and Analysis of Absorption Lines including J = K Rotational Levels of CH3CN: The Envelope of Sagittarius B2(M)
Mitsunori Araki, Shuro Takano, Nobuhiko Kuze +5
Molecules in diffuse and translucent clouds experience cooling as a result of radiation and less excitation from collisions. However, a rotation around a molecular axis of acetonit…
A molecular line survey toward the nearby galaxies NGC 1068, NGC 253, and IC 342 at 3 mm with the Nobeyama 45 m radio telescope: The data
Shuro Takano, Taku Nakajima, Kotaro Kohno
We present observational data of a molecular line survey toward the nearby galaxies NGC 1068, NGC 253, and IC 342 at the wavelengths of 3 mm (85--116 GHz) obtained with the N…
An unbiased spectral line survey observation toward the low-mass star-forming region L1527
Kento Yoshida, Nami Sakai, Yuri Nishimura +5
An unbiased spectral line survey toward a solar-type Class 0/I protostar, IRAS04368+2557, in L1527 has been carried out in the 3 mm band with the Nobeyama 45 m telescope. L1527 is…
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…
A Molecular Line Survey toward the Nearby Galaxies NGC 1068, NGC 253, and IC 342 at 3 mm with the Nobeyama 45-m Radio Telescope: Impact of an AGN on 1 kpc Scale Molecular Abundances
Taku Nakajima, Shuro Takano, Kotaro Kohno +2
It is important to investigate the relationships between the power sources and the chemical compositions of galaxies for understanding the scenario of galaxy evolution. We carried…
Diverse nuclear star-forming activities in the heart of NGC 253 resolved with ten-pc scale ALMA images
Ryo Ando, Kouichiro Nakanishi, Kotaro Kohno +13
We present an 8 pc x 5 pc resolution view of the central ~ 200 pc region of the nearby starburst galaxy NGC 253, based on ALMA Band 7 (λ ~ 0.85 mm or ν ~ 350 GHz) observations cove…
A statistical study of giant molecular clouds traced by CO, CO, CS, and CHOH in the disk of NGC 1068 based on ALMA observations
Tomoka Tosaki, Kotaro Kohno, Nanase Harada +7
We present (98 pc) resolution ALMA observations of CO(=1-0), CO(=1-0), CS(=2-1) and CHOH(=-) molecular lines in the central (…
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…
Precise observations of the 12C/13C ratios of HC3N in the low-mass star-forming region L1527
Mitsunori Araki, Shuro Takano, Nami Sakai +4
Using the Green Bank 100 m telescope and the Nobeyama 45 m telescope, we have observed the rotational emission lines of the three 13C isotopic species of HC3N in the 3 and 7 mm ban…
Implication of Formation Mechanisms of HC5N in TMC-1 as Studied by 13C Isotopic Fractionation
Kotomi Taniguchi, Hiroyuki Ozeki, Masao Saito +5
We observed the J = 9-8 and 16-15 rotational transitions of the normal species and five 13C isotopologues of HC5N to study its formation mechanisms toward the cyanopolyyne peak in…
Z45: A New 45-GHz Band Dual-Polarization HEMT Receiver for the NRO 45-m Radio Telescope
Fumitaka Nakamura, Hideo Ogawa, Yoshinori Yonekura +20
We developed a dual-linear-polarization HEMT (High Electron Mobility Transistor) amplifier receiver system of the 45-GHz band (hereafter Z45), and installed it in the Nobeyama 45-m…
ALMA Observations of the Submillimeter Dense Molecular Gas Tracers in the Luminous Type-1 Active Nucleus of NGC 7469
Takuma Izumi, Kotaro Kohno, Susanne Aalto +30
We present ALMA Cycle 1 observations of the central kpc region of the luminous type-1 Seyfert galaxy NGC 7469 with unprecedented high resolution (0.5 0.4 = 165 pc $\…
Abundance Anomaly of the C Isotopic Species of c-CH in the Low-Mass Star Formation Region L1527
Kento Yoshida, Nami Sakai, Tomoya Tokudome +9
The rotational spectral lines of c-CH and two kinds of the C isotopic species, c-CCCH ( symmetry) and c-CCCH ( symmetry) have been…
A Multi-Transition Study of Molecules toward NGC 1068 based on High-Resolution Imaging Observations with ALMA
Taku Nakajima, Shuro Takano, Kotaro Kohno +6
We present 0.8-mm band molecular images and spectra obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) toward one of the nearest galaxies with an active galactic…
Multi-molecule ALMA observations towards the Seyfert 1 galaxy NGC 1097
S. Martin, K. Kohno, T. Izumi +17
The nearby Sy 1 galaxy NGC 1097 represents an ideal laboratory to explore the molecular chemistry in the presence and surroundings of an active galactic nucleus. Exploring the dist…