Junichi Baba
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View article: Bar-driven Streaming Motions Mimic a Massive Bulge in the Inner Milky Way
Bar-driven Streaming Motions Mimic a Massive Bulge in the Inner Milky Way Open
The circular speed curve of the Milky Way provides a key constraint on its mass distribution, reflecting the axisymmetric component of the gravitational potential. This is especially critical in the inner Galaxy ( R ≲ 4 kpc), where nonaxis…
View article: Bar-driven Streaming Motions Mimic a Massive Bulge in the Inner Milky Way
Bar-driven Streaming Motions Mimic a Massive Bulge in the Inner Milky Way Open
The circular speed curve of the Milky Way provides a key constraint on its mass distribution, reflecting the axisymmetric component of the gravitational potential. This is especially critical in the inner Galaxy ($R \lesssim 4$ kpc), where…
View article: Ripples spreading across the Galactic disc
Ripples spreading across the Galactic disc Open
Context . Gaia data have revealed vertically asymmetric phase-space structures in the Milky Way (MW) disc, such as phase spirals, indicating vertical oscillations. These oscillations exhibit two distinct modes, the bending mode and the bre…
View article: Influence of Bar Formation on Star Formation Segregation and Stellar Migration: Implications for Variations in the Age Distribution of Milky Way Disk Stars
Influence of Bar Formation on Star Formation Segregation and Stellar Migration: Implications for Variations in the Age Distribution of Milky Way Disk Stars Open
We present a chemo-dynamical $N$-body/hydrodynamic simulation of an isolated Milky Way-like galaxy to investigate how bar formation influences star formation rates, stellar migration, and the resulting age and metallicity distributions of …
View article: Closure of Oroantral Communication Utilising Buccal Fat Pad without Removing the Implants in Maxillary Sinusitis: A Case Report of Two Cases
Closure of Oroantral Communication Utilising Buccal Fat Pad without Removing the Implants in Maxillary Sinusitis: A Case Report of Two Cases Open
Although the sinus lift procedure is relatively safe and well-known for bone augmentation in implant cases, it can occasionally lead to acute and chronic postoperative sinusitis as a complication. Generally, treatment for such complication…
View article: Ripples spreading across the Galactic disc. Interplay of direct and indirect effects of the Sagittarius dwarf impact
Ripples spreading across the Galactic disc. Interplay of direct and indirect effects of the Sagittarius dwarf impact Open
Gaia data have revealed vertically asymmetric phase-space structures in the Milky Way (MW) disc, such as phase spirals, indicating vertical oscillations. These oscillations exhibit two distinct modes: the bending mode and the breathing mod…
View article: Solar System Migration Points to a Renewed Concept: Galactic Habitable Orbits
Solar System Migration Points to a Renewed Concept: Galactic Habitable Orbits Open
Astrophysical evidence suggests that the Sun was born near 5 kpc from the Galactic center, within the corotation radius of the Galactic bar, around 6–7 kpc. This presents challenges for outward migration due to the Jacobi energy constraint…
View article: Clues to growth and disruption of two neighbouring spiral arms of the Milky Way
Clues to growth and disruption of two neighbouring spiral arms of the Milky Way Open
Studying the nature of spiral arms is essential for understanding the formation of the intricate disc structure of the Milky Way. The European Space Agency’s Gaia mission has provided revolutionary observational data that have uncovered de…
View article: JASMINE: Near-infrared astrometry and time-series photometry science
JASMINE: Near-infrared astrometry and time-series photometry science Open
The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science …
View article: Impacts of the Local arm on the local circular velocity inferred from the <i>Gaia</i> DR3 young stars in the Milky Way
Impacts of the Local arm on the local circular velocity inferred from the <i>Gaia</i> DR3 young stars in the Milky Way Open
A simple one-dimensional axisymmetric disc model is applied to the kinematics of O type and B type stars (OB stars) near the Sun obtained from Gaia Data Release 3 catalogue. The model determines the ‘local centrifugal speed’ Vc(R0) – defin…
View article: Clues to growth and disruption of two neighbouring spiral arms of the Milky Way
Clues to growth and disruption of two neighbouring spiral arms of the Milky Way Open
Studying the nature of spiral arms is essential for understanding the formation of the intricate disc structure of the Milky Way. The European Space Agency's Gaia mission has provided revolutionary observational data that have uncovered de…
View article: Growing local arm inferred by the breathing motion
Growing local arm inferred by the breathing motion Open
Theoretical models of spiral arms suggest that the spiral arms provoke a vertical bulk motion in disc stars. By analysing the breathing motion, a coherent asymmetric vertical motion around the mid-plane of the Milky Way disc, with Gaia DR3…
View article: Detecting a disc bending wave in a barred-spiral galaxy at redshift 4.4
Detecting a disc bending wave in a barred-spiral galaxy at redshift 4.4 Open
The recent discovery of barred spiral galaxies in the early Universe (z > 2) poses questions of how these structures form and how they influence galaxy evolution in the early Universe. In this study, we investigate the morphology and ki…
View article: Exploring the Sun’s birth radius and the distribution of planet building blocks in the Milky Way galaxy: a multizone Galactic chemical evolution approach
Exploring the Sun’s birth radius and the distribution of planet building blocks in the Milky Way galaxy: a multizone Galactic chemical evolution approach Open
We explore the influence of the Milky Way galaxy’s chemical evolution on the formation, structure, and habitability of the Solar system. Using a multizone Galactic chemical evolution (GCE) model, we successfully reproduce key observational…
View article: Exploring the Sun's birth radius and the distribution of planet building blocks in the Milky Way galaxy: A multi-zone Galactic chemical evolution approach
Exploring the Sun's birth radius and the distribution of planet building blocks in the Milky Way galaxy: A multi-zone Galactic chemical evolution approach Open
We explore the influence of the Milky Way galaxy's chemical evolution on the formation, structure, and habitability of the Solar system. Using a multi-zone Galactic Chemical Evolution (GCE) model, we successfully reproduce key observationa…
View article: Impacts of the Local arm on the local circular velocity inferred from the Gaia DR3 young stars in the Milky Way
Impacts of the Local arm on the local circular velocity inferred from the Gaia DR3 young stars in the Milky Way Open
A simple one-dimensional axisymmetric disc model is applied to the kinematics of OB stars near the Sun obtained from Gaia DR3 catalogue. The model determines the 'local centrifugal speed' $V_\mathrm{c}(R_{0})$ - defined as the circular vel…
View article: Growing Local arm inferred by the breathing motion
Growing Local arm inferred by the breathing motion Open
Theoretical models of spiral arms suggest that the spiral arms provoke a vertical bulk motion in disc stars. By analysing the breathing motion, a coherent asymmetric vertical motion around the mid-plane of the Milky Way disc, with $\textit…
View article: Metallicities of Classical Cepheids in the Inner Galactic Disk
Metallicities of Classical Cepheids in the Inner Galactic Disk Open
Metallicity gradients refer to the sloped radial profiles of the metallicities of gas and stars and are commonly seen in disk galaxies. A well-defined metallicity gradient of the Galactic disk is observed particularly well with classical C…
View article: Transcriptome of Oral Cancer Cells Adapted to Suspension Culture Is Potentially Related to Cancer Progressive Phenotypes
Transcriptome of Oral Cancer Cells Adapted to Suspension Culture Is Potentially Related to Cancer Progressive Phenotypes Open
Our transcriptome analysis revealed several potentially activated pathways and molecules in the floating-adapted oral cancer cells and indicated molecular implications for cancer progression.
View article: Dynamical Influence of a Central Massive Object on Double-Barred Galaxies: Self-Destruction Mechanism of Secondary Bars
Dynamical Influence of a Central Massive Object on Double-Barred Galaxies: Self-Destruction Mechanism of Secondary Bars Open
Double-barred galaxies exhibit sub-kpc secondary stellar bars that are crucial for channeling gases towards a central massive object (CMO) such as a supermassive black hole or a nuclear star cluster. Recent $N$-body simulations have uncove…
View article: Detecting a disk bending wave in a barred-spiral galaxy at redshift 4.4
Detecting a disk bending wave in a barred-spiral galaxy at redshift 4.4 Open
The recent discovery of barred spiral galaxies in the early universe ($z>2$) poses questions of how these structures form and how they influence galaxy evolution in the early universe. In this study, we investigate the morphology and kinem…
View article: Metallicities of Classical Cepheids in the Inner Galactic Disk
Metallicities of Classical Cepheids in the Inner Galactic Disk Open
Metallicity gradients refer to the sloped radial profile of metallicities of gas and stars and are commonly seen in disk galaxies. A well-defined metallicity gradient of the Galactic disk is observed particularly well with classical Cephei…
View article: JASMINE: Near-Infrared Astrometry and Time Series Photometry Science
JASMINE: Near-Infrared Astrometry and Time Series Photometry Science Open
Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, the Japan Aerospace Exploration Agency. JASMINE has two main science goal…
View article: Diverse Molecular Structures across the Whole Star-forming Disk of M83: High-fidelity Imaging at 40 pc Resolution
Diverse Molecular Structures across the Whole Star-forming Disk of M83: High-fidelity Imaging at 40 pc Resolution Open
We present Atacama Large Millimeter/submillimeter Array (ALMA) imaging of molecular gas across the full star-forming disk of the barred spiral galaxy M83 in CO( J = 1–0). We jointly deconvolve the data from ALMA’s 12 m, 7 m, and Total Powe…
View article: Efficient radial migration by giant molecular clouds in the first several hundred Myr after the stellar birth
Efficient radial migration by giant molecular clouds in the first several hundred Myr after the stellar birth Open
Stars in the Galactic disc, including the Solar system, have deviated from their birth orbits and have experienced radial mixing and vertical heating. By performing hydrodynamical simulations of a galactic disc, we investigate how much tra…
View article: Diverse Molecular Structures Across The Whole Star-Forming Disk of M83: High fidelity Imaging at 40pc Resolution
Diverse Molecular Structures Across The Whole Star-Forming Disk of M83: High fidelity Imaging at 40pc Resolution Open
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 sensitivity and resolution of 10^4Msun and 40 pc. The full…
View article: Chasing the impact of the <i>Gaia</i>-Sausage-Enceladus merger on the formation of the Milky Way thick disc
Chasing the impact of the <i>Gaia</i>-Sausage-Enceladus merger on the formation of the Milky Way thick disc Open
We employ our Bayesian Machine Learning framework BINGO (Bayesian INference for Galactic archaeOlogy) to obtain high-quality stellar age estimates for 68 360 red giant and red clump stars present in the 17th data release of the Sloan Digit…
View article: Large dentigerous cyst associated with the maxillary impacted supernumerary teeth: A rare occurrence and literature review
Large dentigerous cyst associated with the maxillary impacted supernumerary teeth: A rare occurrence and literature review Open
Dentigerous cysts are common odontogenic cysts of the jaw but are rarely associated with supernumerary teeth. Few cases of large dentigerous cysts associated with anterior maxillary supernumerary teeth have been reported. The English liter…
View article: Cytomorphology and Gene Expression Signatures of Anchorage-independent Aggregations of Oral Cancer Cells
Cytomorphology and Gene Expression Signatures of Anchorage-independent Aggregations of Oral Cancer Cells Open
The results suggest specific cytomorphological and gene expression changes in oral cancer cell aggregates. Our findings provide insights into the mechanisms underlying anchorage-independent oral cancer cell aggregation and reveal previousl…
View article: Chasing the impact of the Gaia-Sausage-Enceladus merger on the formation of the Milky Way thick disc
Chasing the impact of the Gaia-Sausage-Enceladus merger on the formation of the Milky Way thick disc Open
We employ our Bayesian Machine Learning framework BINGO (Bayesian INference for Galactic archaeOlogy) to obtain high-quality stellar age estimates for 68,360 red giant and red clump stars present in the 17th data release of the Sloan Digit…