Interstellar gas within $\sim 10$ pc of Sgr A${}^{\ast }$

Abstract

We seek to obtain a coherent and realistic three-dimensional picture of the interstellar gas out to about 10 pc of the dynamical center of our Galaxy, which is supposed to be at Sgr A${}^{\ast }$. We review the existing observational studies on the different gaseous components that have been identified near Sgr A${}^{\ast }$, and retain all the information relating to their spatial configuration and/or physical state. Based on the collected information, we propose a three-dimensional representation of the interstellar gas, which describes each component in terms of both its precise location and morphology and its thermodynamic properties. The interstellar gas near Sgr A${}^{\ast }$ can represented by five basic components, which are, by order of increasing size: (1) a central cavity with roughly equal amounts of warm ionized and atomic gases, (2) a ring of mainly molecular gas, (3) a supernova remnant filled with hot ionized gas, (4) a radio halo of warm ionized gas and relativistic particles, and (5) a belt of massive molecular clouds. While the halo gas fills $\approx 80$ of the studied volume, the molecular components enclose $\approx 98$ of the interstellar mass.

21 pages, 7 figures

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Cited by in corpus (47)

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• Free motion around black holes with discs or rings: between integrability and chaos - II
• The influence of circumnuclear environment on the radio emission from TDE jets
• Milky Way Supermassive Black Hole: Dynamical Feeding from the Circumnuclear Environment
• Free motion around black holes with discs or rings: between integrability and chaos - III
• Bremsstrahlung gamma rays from light Dark Matter
• The Molecular Gas Environment in the 20 km s${}^{-1}$ Cloud in the Central Molecular Zone
• Monte Carlo modelling of the propagation and annihilation of nucleosynthesis positrons in the Galaxy
• Polarization and long-term variability of Sgr A* X-ray echo
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• Structure and kinematics of shocked gas in Sgr B2: further evidence of a cloud-cloud collision from SiO emission maps
• A novel analytical model of the magnetic field configuration in the Galactic Center
• The origin of the 6.4 keV line emission and H${}_2$ ionization in the diffuse molecular gas of the Galactic center region
• Observational consistency and future predictions for a 3.5 keV ALP to photon line
• High-speed molecular cloudlets around the Galactic Center supermassive black hole
• 3-D CMZ IV: Distinguishing Near vs. Far Distances in the Galactic Center Using Spitzer and Herschel
• Analytical and numerical studies of central galactic outflows powered by tidal disruption events -- a model for the Fermi bubbles?
• Exploring the Nature of the Galactic Center Gamma-Ray Source with the Cherenkov Telescope Array
• The OH-streamer in Sgr A revisited: analysis of hydroxyl absorption within 10 pc from the Galactic centre
• Herschel HIFI Observations of the Sgr A +50 km/s Cloud. Deep Searches for O2 in Emission and Foreground Absorption
• A Clustering Analysis of the Morphology of the 130 GeV Gamma-Ray Feature
• VLA Observations of Single Pulses from the Galactic Center Magnetar
• 25 years of XMM-Newton observations of the Sgr A complex: 3D distribution and internal structure of the clouds
• A common origin for the circumnuclear disc and the nearby molecular clouds in the Galactic Centre
• Feeding of active galactic nuclei by dynamical perturbations
• X-Ray afterglow of SWIFT J1644+57: a Compton echo?
• Improving Black Hole Accretion Treatment in Hydrodynamical Simulations
• Imprints of Molecular Clouds in Radio Continuum Images
• When Dark Matter interacts with Cosmic Rays or Interstellar Matter: A Morphological Study
• Mapping the aliphatic hydrocarbon content of interstellar dust in the Galactic plane
• Hydrodynamic Evolution of Sgr A East: The Imprint of A Supernova Remnant in the Galactic Center
• MOLsphere and pulsations of the Galactic Center's red supergiant GCIRS 7 from VLTI/GRAVITY
• Odin observations of ammonia in the Sgr A +50 km/s Cloud and Circumnuclear Disk
• Herschel water maps towards the vicinity of the black hole Sgr A*
• The Chemistry and Kinematics of Two Molecular Clouds near Sagittarius A*
• Origin of X-ray and gamma-ray emission from the Galactic central region
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre
• Mapping dark matter in the Milky Way, a synopsis
• Investigating the interplay of the braneworld gravity and the plasma environment on the black hole shadow
• High Energy Emission from the Galactic Center
• Accelerated protons produced by magnetic Penrose process in Sgr A*