SIMBAD references

2014MNRAS.439.3016M - Mon. Not. R. Astron. Soc., 439, 3016-3021 (2014/April-2)

The soft-X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view.

MATT G., MARINUCCI A., GUAINAZZI M., BRENNEMAN L.W., ELVIS M., LOHFINK A., AREVALO P., BOGGS S.E., CAPPI M., CHRISTENSEN F.E., CRAIG W.W., FABIAN A.C., FUERST F., HAILEY C.J., HARRISON F.A., PARKER M., REYNOLDS C.S., STERN D., WALTON D.J. and ZHANG W.W.

Abstract (from CDS):

We present simultaneous XMM-Newton and NuSTAR observations of the `bare' Seyfert 1 galaxy, Ark 120, a system in which ionized absorption is absent. The NuSTAR hard-X-ray spectral coverage allows us to constrain different models for the excess soft-X-ray emission. Among phenomenological models, a cutoff power law best explains the soft-X-ray emission. This model likely corresponds to Comptonization of the accretion disc seed UV photons by a population of warm electrons: using Comptonization models, a temperature of ∼ 0.3 keV and an optical depth of ∼ 13 are found. If the UV-to-X-ray optxagnf model is applied, the UV fluxes from the XMM-Newton Optical Monitor suggest an intermediate black hole spin. Contrary to several other sources observed by NuSTAR, no high-energy cutoff is detected with a lower limit of 190 keV.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): accretion, accretion discs - galaxies: active - galaxies: individual: Ark 120

Simbad objects: 6

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