The discovery of a new non-thermal X-ray filament near the Galactic Centre

Details The discovery of a new non-thermal X-ray filament near the Galactic Centre The discovery of a new non-thermal X-ray filament near the Galactic Centre

2002-11-26

arxiv.org/abs/astro-ph/0211572v1

Mon.Not.Roy.Astron.Soc. 340 (2003) 747

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, Accepted for publication in MNRAS, also found in http://www.star.le.ac.uk/~mas/research/paper/#Sakano2002m

Scientific paper

10.1046/j.1365-8711.2003.06299.x

We report the discovery by XMM-Newton and Chandra of a hard extended X-ray source (XMM J174540-2904.5) associated with a compact non-thermal radio filament (the Sgr A-E `wisp'=1LC 359.888-0.086= G359.88-0.07), which is located within ~4 arcmin of the Galactic Centre. The source position is also coincident with the peak of the molecular cloud, M -0.13-0.08 (the `20 km/s' cloud). The X-ray spectrum is non-thermal with an energy index of 1.0 (+1.1 -0.9) and column density of 38 (+7 -11) x 10^22 H/cm2. The observed 2--10 keV flux of 4 x 10^-13 erg/s/cm2 converts to an unabsorbed X-ray luminosity of 1 x 10^34 erg/s assuming a distance of 8.0 kpc. The high column density strongly suggests that this source is located in or behind the Galactic Centre Region. Taking account of the broad-band spectrum, as well as the source morphology and the positional coincidence with a molecular cloud, we concluded that both the radio and X-ray emission are the result of synchrotron radiation. This is the first time a filamentary structure in the Galactic Centre Region. has been shown, unequivocally, to have a non-thermal X-ray spectrum.

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