Spatially resolved near-infrared emission and a bubble of hot gas in the central active region of the Galaxy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Black Holes (Astronomy), High Temperature Gases, Infrared Sources (Astronomy), Milky Way Galaxy, Near Infrared Radiation, Radio Sources (Astronomy), Accretion Disks, Infrared Spectroscopy, Interstellar Gas, Spatial Resolution

Scientific paper

Near-infrared speckle and imaging spectroscopic observations are reported which resolve the central Galactic complex comprising SgrA* and the infrared source IRS16 into about two dozen compact sources. An expanding bubble of hot gas is found to be centered within 3 arcsec of SgrA*. There is also evidence of a blue object, positionally coincident with SgrA*, emitting at 2 microns. The hot bubble is probably created by shock excitation of a fast wind. These observations are consistent with the presence of an accreting massive black hole at the Galactic center.

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