2011A&A...528A.140T


Query : 2011A&A...528A.140T

2011A&A...528A.140T - Astronomy and Astrophysics, volume 528A, 140-140 (2011/4-1)

Concurrent X-ray, near-infrared, sub-millimeter, and GeV gamma-ray observations of Sagittarius A*.

TRAP G., GOLDWURM A., DODDS-EDEN K., WEISS A., TERRIER R., PONTI G., GILLESSEN S., GENZEL R., FERRANDO P., BELANGER G., CLENET Y., ROUAN D., PREDEHL P., CAPELLI R., MELIA F. and YUSEF-ZADEH F.

Abstract (from CDS):

The radiative counterpart of the supermassive black hole at the Galactic center (GC), SgrA*, is subject to frequent flares that are visible simultaneously in X-rays and the near-infrared (NIR). Often, enhanced radio variability from centimeter to sub-millimeter wavelengths is observed to follow these X-ray/NIR eruptions. We present here a multi-wavelength campaign carried out in April 2009, with the aim of characterizing this broadband flaring activity. Concurrent data from the XMM-Newton/EPIC (2-10keV), VLT/NACO (2.1µm, 3.8µm), APEX/LABOCA (870µm), and Fermi/LAT (0.1-200GeV) instruments are employed to derive light curves and spectral energy distributions of new flares from SgrA*. We detected two relatively bright NIR flares, both associated with weak X-ray activity, one of which was followed by a strong sub-mm outburst ∼200-min later. Photometric spectral information on a NIR flare was obtained for the first time with NACO, giving a power-law photon index α=-0.4±0.3 (Fν∝να). The first attempt to detect flaring activity from the Fermi GC source 1FGLJ1745.6-2900 is also reported. We model NIR, X-ray, and sub-mm flares in the context of non-thermal emission processes. We find that the simplest scenario involving a single expanding plasmoid releasing synchrotron NIR/sub-mm and synchrotron self-Compton X-ray radiation is inadequate to reproduce the data, but we offer suggestions to reconcile the basic elements of the theory and the observations.

Abstract Copyright:

Journal keyword(s): Galaxy: center - black hole physics - radiation mechanisms: non-thermal - X-rays: general - infrared: general - submillimeter: general

Simbad objects: 28

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Number of rows : 28
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 PSR J1732-31 Psr 17 32 33.551 -31 31 20.85           ~ 62 0
2 NAME Tornado Nebula SNR 17 40 16.360 -30 58 18.87           ~ 138 0
3 1FGL J1744.0-2931c gam 17 44 01 -29 31.9           ~ 7 0
4 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 925 0
5 GCM -0.13 -0.08 MoC 17 45 25.2 -29 05 30           ~ 113 1
6 CXOGC J174538.0-290022 X 17 45 38.07 -29 00 22.3           ~ 20 0
7 [KRL2007b] 270 gam 17 45 38.5 -29 01 15           ~ 25 0
8 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12320 0
9 GCIRS 13 Em* 17 45 39.76 -29 00 29.8           ~ 132 0
10 CXOGC J174539.7-290022 Psr 17 45 39.80 -29 00 19.9           ~ 46 1
11 [GEO97] W13 s?b 17 45 39.9799 -29 00 29.103           OBI? 28 0
12 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 353 0
13 NAME Galactic Circumnuclear Disk PoG 17 45 40.0 -29 00 28           ~ 126 0
14 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3686 3
15 [RGH2007] GEN-0.06-1.01 * 17 45 40.0420 -29 00 29.107           O-B 24 0
16 [EG97] S17 ** 17 45 40.04250 -29 00 27.7964           ~ 36 0
17 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 306 1
18 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 128 0
19 NAME Sgr A East Rad 17 45 41 -29 00.8           ~ 459 2
20 CO 000.02-00.02 MoC 17 45.7 -28 56           ~ 27 0
21 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 151 0
22 PSR J1747-2958 Psr 17 47 15.869 -29 58 00.93           ~ 110 1
23 CXOGCS J174742.4-282228 MoC 17 47 42.41 -28 22 28.1           ~ 41 1
24 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 307 0
25 W 31c HII 18 10 29.1 -19 56 05           ~ 311 0
26 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2389 0
27 [EG97] S72 * ~ ~           ~ 3 0
28 [EG97] S65 * ~ ~           ~ 8 0

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2021.08.04-18:46:37

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