M0.20-0.033: An Expanding Molecular Shell in the Galactic Center Radio Arc

Abstract

We present high-frequency Karl G. Jansky Very Large Array (VLA) continuum and spectral line (NH3, H64$\alpha$, and H63$\alpha$) observations of the Galactic Center Radio Arc region, covering the Sickle H II region, the Quintuplet cluster, and molecular clouds M0.20-0.033 and M0.10-0.08. These observations show that the two velocity components of M0.20-0.033 (~25 & 80 km/s), previously thought to be separate clouds along the same line-of-sight, are physically connected in position-velocity space via a third southern component around 50 km/s. Further position-velocity analysis of the surrounding region, using lower-resolution survey observations taken with the Mopra and ATCA telescopes, indicates that both molecular components in M0.20-0.033 are physically connected to the M0.10-0.08 molecular cloud, which is suggested to be located on stream 1 in the Kruijssen et al. (2015) orbital model. The morphology and kinematics of the molecular gas in M0.20-0.033 indicate that the two velocity components in M0.20-0.033 constitute an expanding shell. Our observations suggest that the M0.20-0.033 expanding shell has an expansion velocity of 40 km/s, with a systemic velocity of 53 km/s, comparable to velocities detected in M0.10-0.08. The origin of the expanding shell is located near the Quintuplet cluster, suggesting that the energy and momentum output from this massive stellar cluster may have contributed to the expansion.

21 pages, 15 figures

References in corpus (9)

• An Improved Distance and Mass Estimate for Sgr A* from a Multistar Orbit Analysis
• The dynamical evolution of molecular clouds near the Galactic Centre - I. Orbital structure and evolutionary timeline
• Tracing shocks and photodissociation in the Galactic center region
• Spitzer IRS Observations of the Galactic Center: Shocked Gas in the Radio Arc Bubble
• A Pilot Survey for the H${}_2$O Southern Galactic Plane Survey (HOPS)
• The orbital motion of the Quintuplet cluster - a common origin for the Arches and Quintuplet clusters?
• A large-scale CO survey of the Rosette Molecular Cloud: assessing the effects of O stars on surrounding molecular gas
• Kinematics and properties of the Central Molecular Zone as probed with [C II]
• Nature Versus Nurture: Luminous Blue Variable Nebulae in and near Massive Stellar Clusters at the Galactic Center

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• Rotation measure variations in Galactic Centre pulsars
• Measuring the Orbits of the Arches and Quintuplet Clusters using HST and Gaia: Exploring Scenarios for Star Formation Near the Galactic Center
• A wind-blown bubble in the Central Molecular Zone cloud G0.253+0.016
• Analyzing the Intrinsic Magnetic Field in the Galactic Center Radio Arc
• Evidence for an interaction between the Galactic Center clouds M0.10-0.08 and M0.11-0.11
• CO Observations of the SMC-N66 Hii Region with ALMA: Properties of Clumps along Filamentary Molecular Clouds and Possible Expansion Motion
• 6.7 GHz CH3OH absorption towards the N3 Galactic Center point-source