The results from Nobeyama 45 m radio telescope observations of nearby galaxies NGC 1068, NGC 253, and IC 342 on the composition of the molecular gas will presented. NGC 1068 contains an active galactic nucleus (AGN), and the 45 m observations provide good spatial resolution to investigate the composition of...
Recent observations have revealed that giant black holes with masses of several hundred million times larger than the Sun already exist in the early universe at redshift z ~ 7. One of the leading theories for the formation of supermassive black holes in such an early universe is supercritical accretion...
In the standard paradigm of coslmological large scale structure formation in Λ cold dark matter universe, dark matter and baryons gravitationally collapse into a spider web-like network called the cosmic web. In the current theoretical picture, gas inflow and accretion and galaxy formation progresses at the nodes of the cosmic...
Population III (Pop III) stars, forming as the first generation objects in the history of the Universe, bring an end to the dark age of the Universe and pollute the pristine intergalactic medium with heavy elements. Based on recent theoretical studies, there is general agreement that the typical mass scale...
Recently, using Subaru and ALMA, we were able to make a series of press releases entitled “most distant XYZ”. That is, the most distant oxygen (2016.6), the most distant bright emission line (2018.5), the most distant galaxy merger (2019.6), the most distant passive galaxy (2019.9), and the most distant primitive...
During the last decades, our understanding on both galaxy and structure formation in the nearby Universe has been great advanced, thanks to various large cosmological surveys. On the other hand, limited by the capabilities of current facilities, the early stages of both galaxy and structure formation are still not well...
Spiral arms in a disc are structures found in various astronomical objects. Sometimes spiral arms fragment into smaller structures. In this study, the condition for gravitational instability of spiral arms was analytically derived by a linear perturbation analysis. Comparison with simulations confirmed that the analytical solutions can accurately predict the...
In recent years, molecular cloud collisions have attracted attention as the formation process of massive stars and massive clusters. Takahira et al (2014) conducted three-dimensional fluid simulations in which two molecular clouds collide, and reported that a high density turbulent core exceeding 100 solar masses is formed. However, the models...
The FUGIN project is a 12CO(J=1-0), 13CO(J=1-0), C18O(J=1-0) galactic plane survey using the 45 m Nobeyama Space Radio Observatory radio telescope. The goal is to understand the evolution of interstellar gas, e.g., molecular cloud formation, high density gas formation, and star formation in the Galaxy. Observation have been completed and...
With recent observational advances, many galaxies of redshift higher than 7 have been. The next generation observations, e.g. with the James Webb Space Telescope and TMT, the detection of first galaxies exceeding a redshift of 10 is expected. The first galaxies are not only important in understanding the galaxy evolution,...
The results from Nobeyama 45 m radio telescope observations of nearby galaxies NGC 1068, NGC 253, and IC 342 on the composition of the molecular gas will presented. NGC 1068 contains an active galactic nucleus (AGN), and the 45 m observations provide good spatial resolution to investigate the composition of...
February 2020 13 : 30 Nobeyama 45m radio telescope, ALMA, molecular gas, starbursts, and AGN
Recent observations have revealed that giant black holes with masses of several hundred million times larger than the Sun already exist in the early universe at redshift z ~ 7. One of the leading theories for the formation of supermassive black holes in such an early universe is supercritical accretion...
January 2020 13 : 30 black holes, first galaxies, accretion, and radiation hydrodynamics
In the standard paradigm of coslmological large scale structure formation in Λ cold dark matter universe, dark matter and baryons gravitationally collapse into a spider web-like network called the cosmic web. In the current theoretical picture, gas inflow and accretion and galaxy formation progresses at the nodes of the cosmic...
December 2019 13 : 30 ALMA, galaxy formation, and high-z galaxies
Population III (Pop III) stars, forming as the first generation objects in the history of the Universe, bring an end to the dark age of the Universe and pollute the pristine intergalactic medium with heavy elements. Based on recent theoretical studies, there is general agreement that the typical mass scale...
November 2019 13 : 30 first stars, PopIII stars, radiative feedback, radiation hydrodynamics, and cosmological simulations
Recently, using Subaru and ALMA, we were able to make a series of press releases entitled “most distant XYZ”. That is, the most distant oxygen (2016.6), the most distant bright emission line (2018.5), the most distant galaxy merger (2019.6), the most distant passive galaxy (2019.9), and the most distant primitive...
October 2019 13 : 30 galaxy formation and ALMA
During the last decades, our understanding on both galaxy and structure formation in the nearby Universe has been great advanced, thanks to various large cosmological surveys. On the other hand, limited by the capabilities of current facilities, the early stages of both galaxy and structure formation are still not well...
September 2019 13 : 30 galaxy formation, ALMA, and cosmological simulations
Spiral arms in a disc are structures found in various astronomical objects. Sometimes spiral arms fragment into smaller structures. In this study, the condition for gravitational instability of spiral arms was analytically derived by a linear perturbation analysis. Comparison with simulations confirmed that the analytical solutions can accurately predict the...
July 2019 13 : 30 galaxy formation, MHD, and galactic disk In recent years, molecular cloud collisions have attracted attention as the formation process of massive stars and massive clusters. Takahira et al (2014) conducted three-dimensional fluid simulations in which two molecular clouds collide, and reported that a high density turbulent core exceeding 100 solar masses is formed. However, the models...
June 2019 13 : 30 star formation, radiative transfer, and molecular clouds
The FUGIN project is a 12CO(J=1-0), 13CO(J=1-0), C18O(J=1-0) galactic plane survey using the 45 m Nobeyama Space Radio Observatory radio telescope. The goal is to understand the evolution of interstellar gas, e.g., molecular cloud formation, high density gas formation, and star formation in the Galaxy. Observation have been completed and...
May 2019 13 : 30 star formation, observation, and molecular gas
With recent observational advances, many galaxies of redshift higher than 7 have been. The next generation observations, e.g. with the James Webb Space Telescope and TMT, the detection of first galaxies exceeding a redshift of 10 is expected. The first galaxies are not only important in understanding the galaxy evolution,...
April 2019 15 : 00 PopIII stars, James Webb, TMT, radiation hydrodynamics, and cosmological simulations
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