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| Galactic Centre | |
|---|---|
| Name | Galactic Centre |
| Other names | Central Molecular Zone, Inner Galaxy |
| Type | Galactic nucleus |
| Constellation | Sagittarius |
| Distance | ~8 kpc |
| Main features | Sagittarius A*, Central Molecular Zone, Nuclear Star Cluster |
Galactic Centre
The Galactic Centre is the innermost region of the Milky Way encompassing the Nuclear Star Cluster, the Central Molecular Zone, and the supermassive black hole Sagittarius A*. It is a nexus for studies linking Karl Jansky-era radio astronomy, Edwin Hubble-era observational cosmology, and modern instruments such as the Very Large Array, Atacama Large Millimeter/submillimeter Array, and the Chandra X-ray Observatory. Observations across radio, infrared, submillimeter, X-ray, and gamma-ray bands have made it a focal point for research by teams at institutions like the European Southern Observatory, Harvard–Smithsonian Center for Astrophysics, and the Max Planck Institute for Extraterrestrial Physics.
The region hosts a dense concentration of stars, gas, and compact objects similar to nuclei studied in Andromeda Galaxy and M87 while showing unique phenomena comparable to objects observed by the Hubble Space Telescope and the James Webb Space Telescope. Surveys by the Sloan Digital Sky Survey, the Two Micron All-Sky Survey, and the Gaia space observatory have helped map stellar kinematics, complementing spectroscopic campaigns at the Keck Observatory and the Very Large Telescope. The competitive interplay of forces studied by research groups at MIT, Princeton University, and the California Institute of Technology links dynamics investigated in the context of the Fermi Gamma-ray Space Telescope and the IceCube Neutrino Observatory.
Located in the direction of the constellation Sagittarius, the Central Molecular Zone extends across longitudes mapped by Wilkinson Microwave Anisotropy Probe and the Planck satellite. Distance estimates from astrometric campaigns with the VLBA and the GRAVITY instrument on the Very Large Telescope Interferometer place it at roughly 8 kiloparsecs from the Sun. The Nuclear Star Cluster, the circumnuclear disk, and the inner bar connect to the Galactic bulge studied in surveys by the Two Micron All Sky Survey and the GLIMPSE program with the Spitzer Space Telescope. Dynamical modeling conducted by groups at University of Cambridge, University of California, Berkeley, and the Institute for Advanced Study uses data from the Sloan Digital Sky Survey and the Gaia mission.
The compact radio source Sagittarius A* is identified as a supermassive black hole through proper motion studies by teams led by Andrea Ghez at UCLA and by research led by Sheperd Doeleman using the Event Horizon Telescope. Mass measurements derive from stellar orbits traced with the Keck Observatory and the Very Large Telescope, producing constraints used in tests of general relativity originally framed by Albert Einstein and expanded by theoreticians at Princeton University and Cambridge University. Flaring behavior observed with the Chandra X-ray Observatory, the XMM-Newton mission, and the NuSTAR telescope links to relativistic models by researchers at the Perimeter Institute and the Max Planck Institute for Astrophysics.
The Nuclear Star Cluster contains young massive stars first characterized by spectroscopic work at the Keck Observatory and imaging by the Hubble Space Telescope. Young stellar disks discovered by teams at UCLA and Max Planck Institute for Extraterrestrial Physics challenge classical cluster formation scenarios posited by studies at Harvard University and Princeton University. Star formation rates inferred from recombination-line surveys with the SOFIA airborne observatory and the Herschel Space Observatory are compared to extragalactic nuclei studied by the Atacama Large Millimeter/submillimeter Array and the Submillimeter Array. Populations of compact remnants, pulsars, and X-ray binaries have been cataloged by the Chandra X-ray Observatory team and follow-up programs at University of Chicago and Columbia University.
The Central Molecular Zone contains massive clouds such as the Sgr B2 and Sgr C complexes mapped by the Atacama Pathfinder Experiment and the IRAM facilities. Molecular inventories built from observations by the Herschel Space Observatory, ALMA, and the Green Bank Telescope reveal complex chemistry similar to regions studied by teams at the Max Planck Institute for Radio Astronomy and the Centre National de la Recherche Scientifique. Magnetic field structures inferred from polarimetry with the SOFIA observatory and radio measurements with the VLA relate to theoretical work at the Kavli Institute for Theoretical Physics and the Institute of Astronomy, Cambridge.
The Galactic Centre is a bright source of X-rays and gamma rays detected by instruments including the Chandra X-ray Observatory, the XMM-Newton mission, the Fermi Gamma-ray Space Telescope, and the INTEGRAL observatory. High-energy transients, flares, and nonthermal filaments have been analyzed by researchers at MIT, Stanford University, and the Space Telescope Science Institute. Cosmic ray interactions inferred from gamma-ray excesses have prompted studies by teams associated with the Fermi-LAT collaboration and the H.E.S.S. consortium, invoking particle-acceleration scenarios developed at the Max Planck Institute for Nuclear Physics.
Infrared surveys from the Spitzer Space Telescope, the Wide-field Infrared Survey Explorer, and the James Webb Space Telescope penetrate dust obscuration studied in radio by the Very Large Array and in submillimeter by ALMA. Large-scale maps by the Planck collaboration and the Herschel Gould Belt Survey tie into dust emission models from the Max Planck Institute for Astrophysics and the Jet Propulsion Laboratory. Ongoing and planned programs by the Square Kilometre Array and the Next Generation Very Large Array promise deeper insights, coordinated with theoretical work at the Institute for Advanced Study and observational campaigns at the European Southern Observatory.