2006A&A...455....1E


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.17CEST14:26:19

2006A&A...455....1E - Astronomy and Astrophysics, volume 455, 1-10 (2006/8-3)

Polarimetry of near-infrared flares from Sagittarius A*.

ECKART A., SCHOEDEL R., MEYER L., TRIPPE S., OTT T. and GENZEL R.

Abstract (from CDS):

We report new polarization measurements of the variable near-infrared emission of the SgrA* counterpart associated with the massive 3-4x106 M Black Hole at the Galactic Center. We investigate the physical processes responsible for the variable emission from SgrA*. The observations have been carried out using the NACO adaptive optics (AO) instrument at the European Southern Observatory's Very Large Telescope. 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±3min consistent with previous observations. 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.

Abstract Copyright:

Journal keyword(s): black hole physics - infrared: general - accretion, accretion disks - Galaxy: center - Galaxy: nucleus

CDS comments: Fig.9 EF is NAME FINGER IN SGR A WEST in Simbad, LF and XF not in Simbad.

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 4253 Sy1 12 18 26.5155239433 +29 48 46.518670434   14.34 13.57     ~ 952 1
2 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1400 0
3 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12110 0
4 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 352 0
5 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3629 3
6 [EG97] S1 * 17 45 40.0418 -29 00 28.324           B0/2V 84 0
7 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 297 1
8 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 128 0
9 NAME Sgr A West Northern Arm PoG 17 45 40.1 -29 00 28           ~ 22 0
10 GCIRS 21 WR* 17 45 40.222 -29 00 30.85           WC9 95 0
11 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 143 0
12 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 98 0
13 NAME Finger in Sgr A West reg ~ ~           ~ 3 1
14 NAME Eastern Bridge in Sgr A West reg ~ ~           ~ 3 0
15 NAME Eastern Arm in Sgr A West reg ~ ~           ~ 13 0

    Equat.    Gal    SGal    Ecl

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2021.04.17-14:26:19

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