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NEAR-INFRARED 0''.15 RESOLUTION IMAGING OF THE GALACTIC-CENTER
被引:83
|作者:
ECKART, A
GENZEL, R
HOFMANN, R
SAMS, BJ
TACCONIGARMAN, LE
机构:
[1] Max-Planck-Institut für Extraterrestrische Physik, W-8046 Garching bei München, Giessenbachstrasse
来源:
关键词:
GALAXIES;
NUCLEI;
GALAXY;
CENTER;
INFRARED;
STARS;
D O I:
10.1086/186810
中图分类号:
P1 [天文学];
学科分类号:
0704 ;
摘要:
We present deep 1.6 (H) and 2.2 mum (K) images of the central parsec of the Galaxy at a resolution of 0.''15. 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 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 almost-equal-to 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(8) M. 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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页码:L77 / L80
页数:4
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