A Long Observation of NGC 5548 byBeppoSAX: The High‐Energy Cutoff, Intrinsic Spectral Variability, and a Truly Warm Absorber | Zendy

F. Nicastro | Zendy; L. Piro | Zendy; Alessandra De Rosa | Zendy; M. Feroci | Zendy; P. Grandi | Zendy; F. Fiore | Zendy; M. Elvis | Zendy; Francesco Haardt | Zendy; J. S. Kaastra | Zendy; A. Malizia | Zendy; Laura Maraschi | Zendy; G. Matt | Zendy; G. C. Perola | Zendy; Pierre Olivier Petrucci | Zendy

Open Access

A Long Observation of NGC 5548 byBeppoSAX: The High‐Energy Cutoff, Intrinsic Spectral Variability, and a Truly Warm Absorber

Author(s) -

F. Nicastro,

L. Piro,

Alessandra De Rosa,

M. Feroci,

P. Grandi,

F. Fiore,

M. Elvis,

Francesco Haardt,

J. S. Kaastra,

A. Malizia,

Laura Maraschi,

G. Matt,

G. C. Perola,

Pierre Olivier Petrucci

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308950

Subject(s) - photoionization , cutoff , physics , astrophysics , ionization , absorption (acoustics) , flux (metallurgy) , power law , spectral line , ionization energy , atomic physics , astronomy , ion , chemistry , optics , quantum mechanics , statistics , mathematics , organic chemistry

NGC 5548 was observed by BeppoSAX in a single long (8 day) observation from0.2 to 200 keV. We find (1) the spectral variation of the source is produced bya change of the intrinsic power law slope; (2) a high energy cut-off at $E_c=115^{+39}_{-27}$ keV with a hint of change of $E_c$ with flux; (3) OVII andOVIII absorption K edges, and a possible blended OVII-OVIII K$\alpha,\beta$emission feature at $0.54^{+0.07}_{-0.06}$ keV, inconsistent with a purelyphotoionized gas in equilibrium. We propose that the temperature of theabsorbing and emitting gas is $\sim 10^6$ K so that both collisional ionizationand photoionization contribute.Comment: 23 pages, 8 figures. Accepted for publication in The Astrophysical Journa

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