The 0.15 seconds near-infrared imaging of the central parsec of the galaxy

Details The 0.15 seconds near-infrared imaging of the central parsec of the galaxy The 0.15 seconds near-infrared imaging of the central parsec of the galaxy

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993stin...9419415e&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Galactic Nuclei, Infrared Astronomy, K Stars, M Stars, Milky Way Galaxy, Near Infrared Radiation, Image Resolution, Sky Surveys (Astronomy), Star Clusters, Stellar Models

Scientific paper

Deep 1.6 (H) and 2.2 micrometers (K) images of the central parsec of the Galaxy at a resolution of 0.15 seconds are presented. Most of the flux in earlier seeing limited images comes from about 340 unresolved stellar sources with K magnitudes less than or equal to 14. Most of the fainter stars in the central parsec are likely M rather and K giants. The Infrared Research Satellite (IRS) 16 and 13 complexes are resolved into about 25 and 6 sources, a number of which are probably luminous hot stars. The presence of a blue near infrared object at the position of the compact radio source Sgr A (star) is confirmed. The spatial centroid of the number distribution of compact sources is consistent with the position of Sgr A (star) but not with a position in the IRS 16 complex. The stellar surface density is very well fit by an isothermal cluster model with a core radius of 0.15 +/- 0.05 pc. The central stellar density is a few times 10 to the 7th power of the solar mass/cubed pc. Buildup of massive stars by collisional merging of lower mass stars and collisional disruption of giant atmospheres are very probable processes in the central 0.2 pc.

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