Near-infrared 0.15 arcsec resolution imaging of the Galactic center

Details Near-infrared 0.15 arcsec resolution imaging of the Galactic center Near-infrared 0.15 arcsec resolution imaging of the Galactic center

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l..77e&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 2, p. L77-L80.

Astronomy and Astrophysics

Astronomy

96

Galactic Evolution, Galactic Nuclei, Infrared Imagery, Star Clusters, Star Formation, Autocorrelation, Black Holes (Astronomy), Data Reduction, Hot Stars, Main Sequence Stars, Near Infrared Radiation

Scientific paper

We present deep 1.6 (H) and 2.2-micron (K) images of the central parsec of the Galaxy at a resolution of 0.15 aresec. Most of the flux in earlier seeing-limited images comes from about 340 unresolved stellar sources with K-magnitudes not greater than 14. Most of the fainter stars in the central parsec are likely M- rather than K-giants. The IRS 16 and 13 complexes are resolved into about 25 and six sources, a number of which are probably luminous hot stars. We confirm the presence of a blue near-infrared object (K is about 13) at the position of the compact radio source Sgr A*. The spatial centroid of the number distribution of compact sources is consistent with the position of Sgr A* but not with a position in the IRS 16 complex. The stellar surface density is very well fitted by an isothermal cluster model with a core radius of 0.15 + 0.05 pc. The central stellar density is close to 10 exp 8 solar masses/cu pc 3. 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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