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Observation of CHOH and CHOH in Orion KL: A New Tool to Study Star-Formation History
Yoshimasa Watanabe, Takahiro Oyama, Akemi Tamanai +2
Methanol is a seed species of complex organic molecules that is of fundamental importance in astrochemistry. Although various isotopologues of CHOH have been detected in the in…
CH_3OH and Its Deuterated Species in the Disk/Envelope System of the Low-Mass Protostellar Source B335
Yuki Okoda, Yoko Oya, Nami Sakai +5
Deuterium fractionation in the closest vicinity of a protostar is important in understanding its potential heritage to a planetary system. Here, we have detected the spectral line…
Multiple chemical tracers finally unveil the intricate NGC\,1333 IRAS\,4A outflow system. FAUST XVI
Layal Chahine, Cecilia Ceccarelli, Marta De Simone +54
The exploration of outflows in protobinary systems presents a challenging yet crucial endeavour, offering valuable insights into the dynamic interplay between protostars and their…
Diverse Molecular Structures Across The Whole Star-Forming Disk of M83: High fidelity Imaging at 40pc Resolution
Jin Koda, Akihiko Hirota, Fumi Egusa +23
We present high-fidelity CO(1-0) imaging of molecular gas across the full star-forming disk of M83, using ALMA's 12m, 7m, and TP arrays and the MIRIAD package. The data have a mass…
Chemical Differentiation and Temperature Distribution on a Few au Scale around the Protostellar Source B335
Yuki Okoda, Yoko Oya, Muneaki Imai +5
Resolving physical and chemical structures in the vicinity of a protostar is of fundamental importance for elucidating their evolution to a planetary system. In this context, we ha…
FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 16232417
Satoshi Ohashi, Claudio Codella, Nami Sakai +69
We report a study of the low-mass Class-0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using HCO (), CS (), and CCH () lines as…
Molecular Distributions of the Disk/Envelope System of L483: Principal Component Analysis for the Image Cube Data
Yuki Okoda, Yoko Oya, Shotaro Abe +3
Unbiased understandings of molecular distributions in a disk/envelope system of a low-mass protostellar source are crucial for investigating physical and chemical evolution process…
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…
Exploring the 100 au Scale Structure of the Protobinary System NGC 2264 CMM3 with ALMA
Yoshiki Shibayama, Yoshimasa Watanabe, Yoko Oya +8
We have observed the young protostellar system NGC 2264 CMM3 in the 1.3 mm and 2.0 mm bands at a resolution of about 0.1 (70 au) with ALMA. The structures of two distinct compon…
Rotating Motion of the Outflow of IRAS 16293-2422 A1 at its Origin Point near the Protostar
Yoko Oya, Yoshimasa Watanabe, Ana López-Sepulcre +4
The Class 0 protostar IRAS 162932422 Source A is known to be a binary system (A1 and A2) or even a multiple system, which processes a complex outflow structure. We have observed…
Atomic Carbon [CI] Mapping of the Nearby Galaxy M83
Yusuke Miyamoto, Atsushi Yasuda, Yoshimasa Watanabe +6
Atomic carbon (CI) has been proposed to be a global tracer of the molecular gas as a substitute for CO, however, its utility remains unproven. To evaluate the suitability of CI as…
The Perseus ALMA Chemistry Survey (PEACHES). I. The Complex Organic Molecules in Perseus Embedded Protostars
Yao-Lun Yang, Nami Sakai, Yichen Zhang +14
To date, about two dozen low-mass embedded protostars exhibit rich spectra with lines of complex organic molecule (COM). These protostars seem to possess different enrichment in CO…
Molecular Distributions of the Protostellar Envelope and the Outflow of IRAS 15398-3359: Principal Component Analysis
Yuki Okoda, Yoko Oya, Nami Sakai +2
We have imaged 15 molecular-line emissions and the dust continuum emission around the Class 0 protostellar source, IRAS 15398-3359, with ALMA. The outflow structure is mainly trace…
Chemistry and physics of a low-metallicity hot core in the Large Magellanic Cloud
Takashi Shimonishi, Ankan Das, Nami Sakai +5
We present the results of 0.1-pc-scale observations in 250 GHz and 350GHz towards a newly-discovered hot molecular core in a nearby low-metallicity galaxy, the Large Magellanic Clo…
CO Multi-line Imaging of Nearby Galaxies (COMING) IV. Overview of the Project
Kazuo Sorai, Nario Kuno, Kazuyuki Muraoka +36
Observations of the molecular gas in galaxies are vital to understanding the evolution and star-forming histories of galaxies. However, galaxies with molecular gas maps of their wh…
Chemical evolution along the circumnuclear ring of M83
Nanase Harada, Kazushi Sakamoto, Sergio Martin +4
We report an astrochemical study on the evolution of interstellar molecular clouds and consequent star formation in the center of the barred spiral galaxy M83. We used the Atacama…
Molecular Gas Density Measured with HCO and CS toward a Spiral Arm of M51
Yuri Nishimura, Yoshimasa Watanabe, Nanase Harada +2
Observations of various molecular lines toward a disk region of a nearby galaxy are now feasible, and they are being employed as diagnostic tools to study star-formation activities…
A 3 mm Spectral Line Survey toward the Barred Spiral Galaxy NGC 3627
Yoshimasa Watanabe, Yuri Nishimura, Kazuo Sorai +3
We conduct spectral line survey observations in the 3 mm band toward a spiral arm, a bar-end, and a nuclear region of the nearby barred spiral galaxy NGC 3627 with the IRAM 30 m te…
CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303
Yoshiyuki Yajima, Kazuo Sorai, Nario Kuno +24
We present the results of CO(=1-0) and CO(=1-0) simultaneous mappings toward the nearby barred spiral galaxy NGC 4303 as a part of the CO Multi-line Imaging of…
CO Multi-line Imaging of Nearby Galaxies (COMING): VI. Radial variations in star formation efficiency
Kazuyuki Muraoka, Kazuo Sorai, Yusuke Miyamoto +25
We examined radial variations in molecular-gas based star formation efficiency (SFE), which is defined as star formation rate per unit molecular gas mass, for 80 galaxies selected…
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…
CO Multi-line Imaging of Nearby Galaxies (COMING). VII. Fourier decomposition of molecular gas velocity fields and bar pattern speed
Dragan Salak, Yuto Noma, Kazuo Sorai +24
The CO velocity fields of a sample of 20 nearby spiral galaxies, selected from the CO Multi-line Imaging of Nearby Galaxies (COMING) legacy project of No…
Molecular-Cloud-Scale Chemical Composition III: Constraints of Average Physical Properties through Chemical Models
Nanase Harada, Yuri Nishimura, Yoshimasa Watanabe +4
It is important to understand the origin of molecular line intensities and chemical composition in the molecular-cloud scale in the Galactic sources because it serves as a benchmar…
Rotation in the NGC 1333 IRAS 4C Outflow
Yichen Zhang, Aya E. Higuchi, Nami Sakai +8
We report molecular line observations of the NGC 1333 IRAS 4C outflow in the Perseus Molecular Cloud with the Atacama Large Millimeter/Submillimeter Array. The CCH and CS emission…