SIMBAD references

2017MNRAS.468.2447P - Mon. Not. R. Astron. Soc., 468, 2447-2468 (2017/June-3)

A powerful flare from Sgr A* confirms the synchrotron nature of the X-ray emission.

PONTI G., GEORGE E., SCARINGI S., ZHANG S., JIN C., DEXTER J., TERRIER R., CLAVEL M., DEGENAAR N., EISENHAUER F., GENZEL R., GILLESSEN S., GOLDWURM A., HABIBI M., HAGGARD D., HAILEY C., HARRISON F., MERLONI A., MORI K., NANDRA K., OTT T., PFUHL O., PLEWA P.M. and WAISBERG I.

Abstract (from CDS):

We present the first fully simultaneous fits to the near-infrared (NIR) and X-ray spectral slope (and its evolution) during a very bright flare from Sgr A*, the supermassive black hole at the Milky Way's centre. Our study arises from ambitious multiwavelength monitoring campaigns with XMM-Newton, NuSTAR and SINFONI. The average multiwavelength spectrum is well reproduced by a broken power law with ΓNIR = 1.7 ± 0.1 and ΓX = 2.27 ± 0.12. The difference in spectral slopes (ΔΓ = 0.57 ± 0.09) strongly supports synchrotron emission with a cooling break. The flare starts first in the NIR with a flat and bright NIR spectrum, while X-ray radiation is detected only after about 103 s, when a very steep X-ray spectrum (ΔΓ = 1.8 ± 0.4) is observed. These measurements are consistent with synchrotron emission with a cooling break and they suggest that the high-energy cut-off in the electron distribution (γmax) induces an initial cut-off in the optical-UV band that evolves slowly into the X-ray band. The temporal and spectral evolution observed in all bright X-ray flares are also in line with a slow evolution of γmax. We also observe hints for a variation of the cooling break that might be induced by an evolution of the magnetic field (from B ∼ 30 ± 8 G to B ∼ 4.8 ± 1.7 G at the X-ray peak). Such drop of the magnetic field at the flare peak would be expected if the acceleration mechanism is tapping energy from the magnetic field, such as in magnetic reconnection. We conclude that synchrotron emission with a cooling break is a viable process for Sgr A*'s flaring emission.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): black hole physics - methods: data analysis - Galaxy: centre - Galaxy: centre

Simbad objects: 9

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2021.12.05-22:24:30

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