Circumnuclear eccentric gas flow in the Galactic Center revealed by ALMA CMZ Exploration Survey (ACES)
Journal article, 2025
We analyze the CS ( J = 2-1 ) line cube from the internal data release obtained by the large-scale program "ALMA CMZ Exploration Survey ( ACES ) " to investigate the kinematic structure of the innermost similar to 10 pc region of the Galaxy, which contains the high-velocity compact cloud (HVCC) at (l, b, vLSR) similar to(+0 .degrees 02, -0 .degrees 02, 100 km s-1) ( hereafter G0.02 ) . The longitude-velocity diagram (LVD) of the cloud draws an elliptical structure, which is interpreted as an orbital trajectory in the (l, vLSR) space of a noncircular ( eccentric ) motion of the molecular gas in the gravitational potential of an extended mass distribution in the central 10 pc of the Galaxy. We argue that G0.02 is a kinematic tracer of the inner potential, a rare case of a dense an eccentric orbit in the nuclear field.
Galaxy: center
ISM: kinematics and dynamics
ISM: molecules
Galaxy: structure
ISM: clouds
Author
Yoshiaki Sofue
University of Tokyo
Tomoharu Oka
Keio University
Steven N. Longmore
Liverpool John Moores University
Daniel Walker
University of Manchester
Adam Ginsburg
University of Florida
Jonathan D. Henshaw
Max Planck Society
Liverpool John Moores University
John Bally
University of Colorado
Ashley T. Barnes
University of Colorado
Cara Battersby
University of Connecticut
Laura Colzi
Spanish National Research Council (CSIC)
Paul Ho
National Taiwan University
Izaskun Jimenez-Serra
Spanish National Research Council (CSIC)
Elizabeth Mills
University of Kansas
Maya Petkova
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Mattia C. Sormani
University of Insubria
Jennifer Wallace
University of Connecticut
Jairo Armijos-Abendano
Escuela Politécnica Nacional
Katarzyna M. Dutkowska
Leiden University
Rei Enokiya
National Astronomical Observatory of Japan
Pablo Garcia
Chinese Academy of Sciences
Universidad Catolica del Norte
Savannah Gramze
University of Florida
Christian Henkel
Max Planck Society
Yue Hu
Princeton University
Katharina Immer
University of Colorado
Yuhei Iwata
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Janik Karoly
University College London (UCL)
Ralf S. Klessen
Heidelberg University
Harvard University
Harvard-Smithsonian Center for Astrophysics
Kotaro Kohno
University of Tokyo
Mark R. Krumholz
Australian National University
Mark R. Morris
University of California
Jaime E. Pineda
Max Planck Society
Sergio Martin
European Southern Observatory Santiago
Atacama Large Millimeter-submillimeter Array (ALMA)
Miguel Angel Requena-Torres
Towson University
Victor M. Rivilla
Spanish National Research Council (CSIC)
Denise Riquelme-Vasquez
University of La Serena
Alvaro Sanchez-Monge
Inst Estudis Espacials Catalunya IEEC
Universitat Autonoma de Barcelona (UAB)
Miriam G. Santa-Maria
University of Florida
Howard A. Smith
Harvard-Smithsonian Center for Astrophysics
Volker Tolls
Harvard-Smithsonian Center for Astrophysics
Q. Daniel Wang
University of Massachusetts
Publication of the Astronomical Society of Japan
0004-6264 (ISSN) 2053051x (eISSN)
Vol. 77 4 L55-L62Subject Categories (SSIF 2025)
Atom and Molecular Physics and Optics
Astronomy, Astrophysics, and Cosmology
DOI
10.1093/pasj/psaf072