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We present results on the hard X-ray emission of NGC 5506, the brightestnarrow line Seyfert 1 galaxy above 20 keV. All the recent observations byINTEGRAL, Swift and Suzaku have been analysed and spectral analysis during nineseparated time periods has been performed. While flux variations by a factor of2 were detected during the last 7 years, only moderate spectral variations havebeen observed, with the hint of a hardening of the X-ray spectrum and adecrease of the intrinsic absorption with time. Using Suzaku observations it ispossible to constrain the amount of Compton reflection to R = 0.6-1.0, inagreement with previous results on the source. The signature of Comptonisationprocesses can also be found in the detection of a high-energy cut-off duringpart of the observations, at Ec = 40-100 keV. When a Comptonisation model isapplied to the Suzaku data, the temperature and the optical depth of theComptonising electron plasma are measured at kT = 60-80 keV and tau = 0.6-1.0,respectively. The properties inferred for NGC 5506 in this study agree withthose based on other data sets for the same AGN, and fit the picture of NLS1having in general lower high-energy cut-offs at hard X-rays than their broadline equivalent.

High-energy emission from NGC 5506, the brightest hard X-ray Narrow Line Seyfert 1 galaxy