Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..445s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 15, 1985, p. 445-458.
Astronomy and Astrophysics
Astronomy
124
Black Holes (Astronomy), Forbidden Transitions, Galactic Nuclei, Infrared Astronomy, Milky Way Galaxy, Neon, Fine Structure, Kepler Laws, Mass Distribution, Star Clusters, Stellar Orbits
Scientific paper
The velocity field within two pc of the galactic center has been investigated by observing the forbidden Ne II 12.8 micron fine-structure emission from Sgr West. The velocity variation indicates that at least two of the features are large-scale flows of ionized gas. The flow along the southern arm continues all the way north to IRS 8, encircling the center of the galaxy in an arc of about 180 deg. Both the velocity and position along the northern arm are well fitted by a noncircular orbit with mass greater than 3.5 million solar masses within the orbital of about 0.5 pc. These data are taken as evidence for a central black hole of mass three to four million solar masses. A best estimate for the position of the central mass is coincident with IRS 16 NE.
Lacy John H.
Serabyn Eugen
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