A5037375000- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Advanced Combustion Engine Technologies
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Molecular Physics
- Atmospheric and Environmental Gas Dynamics
Nagoya University
2018-2021
We performed new comprehensive $^{13}$CO($J$=2--1) observations toward NGC 2024, the most active star forming region in Orion B, with an angular resolution of $\sim$100'' obtained NANTEN2. found that associated cloud consists two independent velocity components. The components are physically connected to H{\sc ii} as evidenced by their close correlation dark lanes and emission nebulosity. show complementary distribution a displacement $\sim$0.6 pc. Such is typical colliding clouds discovered...
We present $^{12}$CO $J=$1--0, $^{13}$CO $J=$1--0 and C$^{18}$O images of the M17 giant molecular clouds obtained as part FUGIN (FOREST Ultra-wide Galactic Plane Survey InNobeyama) project. The observations cover entire area SW N at highest angular resolution ($\sim$19$"$) to date which corresponds $\sim$ 0.15 pc distance 2.0 kpc. find that region consists four different velocity components: very low (VLV) clump, component (LVC), main (MVC), high (HVC). LVC HVC have cavities. UV photons...
A collision between two molecular clouds is one possible candidate for high-mass star formation. The HII region RCW 36, located in the Vela ridge, contains a young cluster with O-type stars. We present new CO observations of 36 NANTEN2, Mopra, and ASTE using $^{12}$CO($J$ = 1-0, 2-1, 3-2) $^{13}$CO($J$ 2-1) line emissions. have discovered lying at velocities $V_\mathrm{LSR} \sim$5.5 9 km s$^{-1}$. Both are likely to be physically associated cluster, as verified by good spatial correspondence...
Abstract W$\, 51\,$A is one of the most active star-forming regions in Milky Way, and includes copious amounts molecular gas with a total mass ${\sim }6\times 10^{5}\, M_{\odot }$. The has multiple velocity components over ∼20 km s−1, interactions between these have been discussed as mechanism that triggered massive star formation 51\,$A. In this paper, we report on an observational study using new 12CO, 13CO, C18O (J = 1–0) data covering 1${^{\circ}_{.}}$4 × 1${^{\circ}_{.}}$0 area obtained...
Abstract Using the NANTEN2 Observatory, we carried out a molecular-line study of high-mass star forming regions with reflection nebulae, NGC 2068 and 2071, in Orion $^{13}$CO($J = 2$–1) transition. The $^{13}$CO distribution shows that there are two velocity components at ${9.0}$ ${10.5}\:$km$\:$s$^{-1}$. blue-shifted component is northeast associated whereas red-shifted southwest 2068. total intensity clouds gap $\sim\!\! 1\:$pc, suggesting they detached present. A detailed spatial...
Herein, we present the 12CO (J=1-0) and 13CO emission line observations via FOREST Unbiased Galactic plane Imaging survey with Nobeyama 45-m telescope (FUGIN) toward a Spitzer bubble N4. We observed clouds of three discrete velocities: 16, 19, 25 km/s. Their masses were 0.1x10^4 Msun, 0.3x10^4 1.4x10^4 respectively. The distribution 25-km/s cloud likely traces ring-like structure at mid-infrared wavelength. could not find clear expanding motion molecular gas in On contrary, found bridge...
Abstract We carried out 12 CO( J = 1–0) observations of the Galactic gamma-ray supernova remnant (SNR) Kesteven 79 using Nobeyama Radio Observatory 45 m radio telescope, which has an angular resolution ∼20 arcsec. identified molecular and atomic gas interacting with 79, whose radial velocity is ∼80 km s −1 . The gases show good spatial correspondence X-ray shells, have expanding motion ∼4 associated peaks also exhibits a high intensity ratio CO 3–2/1–0 > 0.8, suggesting kinematic...
W51A is one of the most active star-forming region in our Galaxy, which contains giant molecular clouds with a total mass 10^6 Msun. The have multiple velocity components over ~20 km/s, and interactions between these been discussed as mechanism triggered massive star formation W51A. In this paper, we report an observational study using new 12CO, 13CO, C18O (J=1-0) data covering 1.4x1.0 degree obtained Nobeyama 45-m telescope at 20" resolution. Our CO resolved four discrete 50, 56, 60, 68...
Abstract M 16, the Eagle Nebula, is an outstanding H ii region which exhibits extensive high-mass star formation and hosts remarkable “pillars.” We herein obtained new 12COJ = 1–0 data for observed with NANTEN2, were combined using FOREST unbiased galactic plane imaging Nobeyama 45 m telescope (FUGIN) survey. These observations revealed that a giant molecular cloud (GMC) of ∼1.3 × 105 M⊙ associated extends 30 pc perpendicularly to plane, at distance 1.8 kpc. This GMC can be divided into...
Young HII regions are an important site to study O star formation based on distributions of ionized and molecular gas. We revealed that two clouds at $\sim 48$ km s$^{-1}$ 53$ associated with the G018.149-00.283 in RCW 166 by using JCMT CO High-Resolution Survey (COHRS) $^{12}$CO ($J$=3--2) emission. comprises a bright ring 8 $\mu$m extended region inside ring. The cloud delineates ring, is located within indicating complementary distribution between components. propose hypothesis high-mass...
Abstract We have performed new large-scale 12CO, 13CO, and C18O J = 1–0 observations toward the Vulpecula OB association (l ∼ 60°) as part of Nobeyama 45 m Local Spur CO survey project. Molecular clouds are distributed over ∼100 pc, with local peaks at Sh 2-86, 2-87, 2-88 high-mass star-forming regions in complex. The molecular gas is associated Spur, which corresponds to nearest inter-arm region located between Arm Sagittarius Arm. discovered giant filaments (GMFs) a length ∼30 width ∼5...
We have analyzed new CO($J$ = 1-0) data in the region of a reflection nebula NGC 2023 with particular focus on detailed kinematical properties molecular gas. The results show that there are two velocity components which indicate signatures dynamical interaction revealed at high resolution 19$''$ (= 0.04 pc). Based we propose hypothesis clouds collided each other and triggered formation B1.5 star HD 37903 addition to 20 lower mass stars small clusters size 2 pc. Although previous study...
We analyzed the NANTEN2 13CO (J=2-1 and 1-0) datasets in NGC 2024. found that cloud consists of two velocity components, whereas shows mostly single-peaked CO profiles. The components are physically connected to HII region as evidenced by their close correlation with dark lanes emission nebulosity. show complementary distribution a displacement 0.4 pc. Such is typical colliding clouds discovered regions high-mass star formation. hypothesize cloud-cloud collision between triggered formation...
NGC 2359 is an HII region located in the outer Galaxy that contains isolated Wolf-Rayet (WR) star HD 56925. We present millimeter/submillimeter observations of $^{12}$CO($J$ = 1-0, 3-2) line emission toward entire nebula. identified there are three molecular clouds at VLSR $\sim$37, $\sim$54, and $\sim$67 km s$^{-1}$, HI clouds: two them $\sim$54 s$^{-1}$ other $\sim$63 s$^{-1}$. These except for CO cloud 67 limb-brightened radio continuum, suggesting part each has been ionized. newly found...
We report the current status of NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky data cube southern hemisphere using NANTEN2 4-m submillimeter telescope installed at Atacama Desert through developing a new multi-beam receiver and control system. The consists 5 beams. four beams, located corners square with beam separation 720′′, are 100 GHz band SIS having 2-polarization sideband-separation filter. other beam, optical axis, is 200 cooled component modularized...
We report the current status of NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky data cube southern hemisphere using NANTEN2 4-m submillimeter telescope installed at Atacama Desert through developing a new multi-beam receiver and control system. The consists 5 beams. four beams, located corners square with beam separation 720$''$, are 100 GHz band SIS having 2-polarization sideband-separation filter. other beam, optical axis, is 200 cooled component modularized...