Computer Science
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9323095j&link_type=abstract
Unknown
Computer Science
Galactic Nuclei, H I Regions, Infrared Spectroscopy, Milky Way Galaxy, Molecular Gases, Neutral Gases, Density (Mass/Volume), Galaxies, Kinematics, Kuiper Airborne Observatory, Monatomic Gases, Spatial Distribution
Scientific paper
Spectroscopic observations elucidating the spatial distribution, kinematics, and desity structure of atomic and molecular gas within about 2 pc from IRS16/SgrA* are presented. Measurements confirm the presence of a dense (n(H2) approximately 1,000,000/cu cm), clumpy molecular gas ring surrounding a short lived central cavity of much lower mean gas density. It appears that this ring consists of several distinct and probably short lived (less than or approximately equal to 1,000,000 years) gas streamers that result from accretion from the massive molecular clouds within 10 to 30 pc of the center toward the central gravitational potential. Within 1 pc of SgrA*, a large atomic cloud (approximately 300 solar mass) is found, that appears to be falling in from greater than 3 pc galactocentric distance into the central cavity. The northern and eastern 'arms' of ionized gas are very likely dense, bright rims at the surface of this atomic cloud that is now exposed to the intense ultraviolet radiation from the central few arcsec surrounding IRS16/SgrA*. Most of the characteristics of the spatial distribution of the various observed components of ionized, atomic, and molecular gas can now be understood as the result of the impact of 1,000,000 solar luminosity of UV radiation from IRS16/SgrA* in a number of infalling gas streamers.
Geis Norbert
Genzel Reinhard
Harris Andrew I.
Jackson James M.
Madden Suzanne C.
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