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2006A&A...449L..31G - Astronomy and Astrophysics, volume 449, L31-34 (2006/4-2)

Magnetars as persistent hard X-ray sources: INTEGRAL discovery of a hard tail in SGR 1900+14.

GOETZ D., MEREGHETTI S., TIENGO A. and ESPOSITO P.

Abstract (from CDS):

Using 2.5 Ms of data obtained by the INTEGRAL satellite in 2003-2004, we discovered persistent hard X-ray emission from the soft gamma-ray repeater SGR 1900+14. Its 20-100keV spectrum is well described by a steep power law with photon index Γ=3.1±0.5 and flux 1.5x10–11erg/cm2/s. Contrary to SGR 1806-20, the only other soft gamma-ray repeater for which persistent emission above 20keV was reported, SGR 1900+14 has been detected in the hard X-ray range while it was in a quiescent state (the last bursts from this source were observed in 2002). By comparing the broad band spectra (1-100keV) of all the magnetars detected by INTEGRAL (the two SGRs and three anomalous X-ray pulsars) we find evidence for a different spectral behaviour of these two classes of sources.

Journal keyword(s): gamma-rays: observations - pulsars: individual: SGR 1900+14 - pulsars: general

CDS comments: Fig.1 AX J1910.7+917 is a misprint for AX J1910.7+0917