Rotation and stability of the circumnuclear gas disk in the Galactic Center potential by the ALMA CMZ Exploration Survey (ACES)
Artikel i vetenskaplig tidskrift, 2026
We investigated the gravitational potential and mass distribution in the Galactic Center by examining the morphology and kinematics of the circumnuclear gaseous disk revealed by the molecular line data from the ALMA CMZ Exploration Survey. We obtain an estimate of the shape of the potential within the central similar to 20 pc to reproduce the observed properties of the circumnuclear gas disk by simulating the motion of test particles for various axial ratios and show that the potential is approximately spherical. We construct a rotation curve by applying the terminal velocity method to the position-velocity diagrams, and calculate the mass distribution in the Galactic Center. The distribution of mass density is found to be of cusp type, approximated by rho(dyn) similar to 1.56 & times; 10(5)(R/1 pc)( -1.9) M-circle dot pc(-3), where R is the distance from the nucleus. We discuss the tidal effect caused by the gravitational potential that produces the rotation curve and show that the gas disk is stable against self-gravitational contraction within a critical radius of RT similar to 14 (rho(gas)/10(5)H(2) cm(-3) ) (-1/2) pc. This suggests suppression of star formation and a top-heavy initial mass function in the circumnuclear region.
Galaxy: center
Galaxy: structure
stars: formation
ISM: clouds
ISM: kinematics and dynamics
Författare
Yoshiaki Sofue
University of Tokyo
Steven N. Longmore
COOL Research DAO
Liverpool John Moores University
Daniel Walker
University of Manchester
Adam Ginsburg
University of Florida
Jonathan D. Henshaw
Max-Planck-Gesellschaft
Liverpool John Moores University
John Bally
University of Colorado
Ashley T. Barnes
European Southern Observatory (ESO)
Cara Battersby
University of Connecticut
Laura Colzi
Consejo Superior de Investigaciones Científicas (CSIC)
Paul Ho
National Taiwan University
Izaskun Jimenez-Serra
Consejo Superior de Investigaciones Científicas (CSIC)
J. M. Diederik Kruijssen
COOL Research DAO
Elizabeth Mills
University of Kansas
Maya Petkova
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Mattia C. Sormani
Universita degli Studi dell'Insubria
Jen Wallace
University of Connecticut
Jairo Armijos-Abendano
Escuela Politécnica Nacional
Zi-Xuan Feng
Universita degli Studi dell'Insubria
Universität Heidelberg
Karl Fiteni
University of Malta
Universita degli Studi dell'Insubria
Pablo Garcia
Universidad Catolica del Norte
Chinese Academy of Sciences
Savannah Gramze
University of Florida
Christian Henkel
Max-Planck-Gesellschaft
Pei-Ying Hsieh
National Astronomical Observatory of Japan
Ralf S. Klessen
Universität Heidelberg
Francisco Nogueras-Lara
Consejo Superior de Investigaciones Científicas (CSIC)
Dylan M. Pare
Atacama Large Millimeter-submillimeter Array (ALMA)
Victor M. Rivilla
Consejo Superior de Investigaciones Científicas (CSIC)
Alvaro Sanchez-Monge
Consejo Superior de Investigaciones Científicas (CSIC)
Inst Estudis Espacials Catalunya IEEC
Publication of the Astronomical Society of Japan
0004-6264 (ISSN) 2053051x (eISSN)
Vol. 78 2 536-555Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.1093/pasj/psaf159