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2025PASJ...77L..55S - Publ. Astron. Soc. Jap., 77, L55-L62 (2025/April-0)

Circumnuclear eccentric gas flow in the Galactic Center revealed by ALMA CMZ Exploration Survey (ACES).

SOFUE Y., OKA T., LONGMORE S.N., WALKER D., GINSBURG A., HENSHAW J.D., BALLY J., BARNES A.T., BATTERSBY C., COLZI L., HO P., JIMENEZ-SERRA I., KRUIJSSEN J.M.D., MILLS E., PETKOVA M.A., SORMANI M.C., WALLACE J., ARMIJOS-ABENDANO J., DUTKOWSKA K.M., ENOKIYA R., GARCIA P., GRAMZE S., HENKEL C., HSIEH P.-Y., HU Y., IMMER K., IWATA Y., KAROLY J., KLESSEN R.S., KOHNO K., KRUMHOLZ M.R., LIPMAN D., MORRIS M.R., NOGUERAS-LARA F., PINEDA J.E., MARTIN S., REQUENA-TORRES M.A., RIVILLA V.M., RIQUELME-VASQUEZ D., SANCHEZ-MONGE A., SANTA-MARIA M.G., SMITH H.A., TOLLS V. and WANG Q.D.

Abstract (from CDS):

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 ${\sim}10\>$pc region of the Galaxy, which contains the high-velocity compact cloud (HVCC) at $(l,b,v_{\rm LSR})\sim (+{0{_{.}^{\circ}}02},-{0{_{.}^{\circ}}02}, 100 \> \mbox{km}\> \mbox{s}^{-1})$ (hereafter G0.02). The longitude-velocity diagram (LVD) of the cloud draws an elliptical structure, which is interpreted as an orbital trajectory in the $(l,v_{\rm LSR})$ 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 gas following an eccentric orbit in the nuclear gravitational field.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of the Astronomical Society of Japan.

Journal keyword(s): Galaxy: center - Galaxy: structure - ISM: clouds - ISM: kinematics and dynamics - ISM: molecules

Simbad objects: 4

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