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

G. Matt, A. Marinucci, M. Guainazzi, L. W. Brenneman, M. Elvis, A. Lohfink, P. Arevalo, S. E. Boggs, M. Cappi, Finn Erland Christensen, W. W. Craig, A. C. Fabian, F. Fuerst, C. J. Hailey, F. A. Harrison, M. Parker, J. C. Reynolds, D. Stern, D. J. Walton, W. W. Zhang

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 similar to 0.3 keV and an optical depth of similar to 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.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume439
Issue number3
Pages (from-to)3016-3021
Number of pages6
ISSN0035-8711
DOIs
Publication statusPublished - 2014

Keywords

  • ASTRONOMY
  • ACTIVE GALACTIC NUCLEI
  • BLACK-HOLE SPIN
  • LINE REGION SIZES
  • SUZAKU OBSERVATIONS
  • CENTRAL MASSES
  • SKY SURVEY
  • SPECTRA
  • EXCESS
  • PHOTOIONIZATION
  • SEYFERT-1
  • accretion, accretion discs
  • galaxies: active
  • galaxies: individual: Ark 120

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