2004A&A...424L..21C


Query : 2004A&A...424L..21C

2004A&A...424L..21C - Astronomy and Astrophysics, volume 424, L21-25 (2004/9-3)

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

CLENET Y., ROUAN D., GRATADOUR D., LACOMBE F., GENDRON E., GENZEL R., OTT T., SCHOEDEL R. and LENA P.

Abstract (from CDS):

L'-band (λ=3.8µm) and M'-band (λ=4.8µm) 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.

Abstract Copyright:

Journal keyword(s): Galaxy: center - infrared: stars - instrumentation: adaptive optics

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 GCIRS 29N WR* 17 45 39.917 -29 00 26.71           WC9 58 0
2 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 369 0
3 GCIRS 33SE Em* 17 45 40.02 -29 00 31.0           Ofpe/WN9 24 0
4 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4380 3
5 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 371 1
6 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 137 0
7 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 189 1
8 GCIRS 16SE1 WR* 17 45 40.181 -29 00 29.26           WC8/9 48 0
9 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 152 0

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