Polarimetry of near-infrared flares from Sagittarius A

被引:159
作者
Eckart, A. [1 ]
Schoedel, R.
Meyer, L.
Trippe, S.
Ott, T.
Genzel, R.
机构
[1] Univ Cologne, Inst Phys 1, Zulpicher Str 77, D-50937 Cologne, Germany
[2] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源
ASTRONOMY & ASTROPHYSICS | 2006年 / 455卷 / 01期
关键词
black hole physics; infrared : general; accretion; accretion disks; Galaxy : center; Galaxy : nucleus;
D O I
10.1051/0004-6361:20064948
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Context. We report new polarization measurements of the variable near-infrared emission of the SgrA* counterpart associated with the massive 3-4 x 10(6) M-circle dot Black Hole at the Galactic Center. Aims. We investigate the physical processes responsible for the variable emission from SgrA*. Methods. The observations have been carried out using the NACO adaptive optics ( AO) instrument at the European Southern Observatory's Very Large Telescope*. Results. We find that the variable NIR emission of SgrA* is highly polarized and consists of a contribution of a non- or weakly polarized main flare with highly polarized sub-flares. The flare activity shows a possible quasi-periodicity of 20 +/- 3 min consistent with previous observations. Conclusions. The highly variable and polarized emission supports that the NIR emission is non- thermal. The observations can be interpreted in a jet or temporary disk model. In the disk model the quasi-periodic flux density variations can be explained by spots on relativistic orbits around the central MBH. Alternative explanations for the high central mass concentration involving boson or fermion balls are increasingly unlikely.
引用
收藏
页码:1 / 10
页数:10
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