Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO

Details Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO Detection of the Sgr A* activity at 3.8 and 4.8 microns with NACO

2004-07-26

arxiv.org/abs/astro-ph/0407527v1

Astron.Astrophys. 424 (2004) L21

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted in Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:200400045

L'-band (lambda=3.8 microns) and M'-band (lambda=4.8 microns) observations of the Galactic Center region, performed in 2003 at VLT (ESO) with the adaptive optics imager NACO, have lead to the detection of an infrared counterpart of the radio source Sgr A* at both wavelengths. The measured fluxes confirm that the Sgr A* infrared spectrum is dominated by the synchrotron emission of nonthermal electrons. The infrared counterpart exhibits no significant short term variability but demonstrates flux variations on daily and yearly scales. The observed emission arises away from the position of the dynamical center of the S2 orbit and would then not originate from the closest regions of the black hole.

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