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

doi:10.1093/mnras/stu159

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

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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 language	English
Journal	Monthly Notices of the Royal Astronomical Society
Volume	439
Issue number	3
Pages (from-to)	3016-3021
Number of pages	6
ISSN	0035-8711
DOIs	https://doi.org/10.1093/mnras/stu159
Publication status	Published - 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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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, J. C., Stern, D., Walton, D. J., & Zhang, W. W. (2014). The soft-X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view. Monthly Notices of the Royal Astronomical Society, 439(3), 3016-3021. https://doi.org/10.1093/mnras/stu159

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

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.",

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",

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

year = "2014",

doi = "10.1093/mnras/stu159",

language = "English",

volume = "439",

pages = "3016--3021",

journal = "Monthly Notices of the Royal Astronomical Society",

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Matt, G, Marinucci, A, Guainazzi, M, Brenneman, LW, Elvis, M, Lohfink, A, Arevalo, P, Boggs, SE, Cappi, M, Christensen, FE, Craig, WW, Fabian, AC, Fuerst, F, Hailey, CJ, Harrison, FA, Parker, M, Reynolds, JC, Stern, D, Walton, DJ & Zhang, WW 2014, 'The soft-X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view', Monthly Notices of the Royal Astronomical Society, vol. 439, no. 3, pp. 3016-3021. https://doi.org/10.1093/mnras/stu159

TY - JOUR

T1 - The soft-X-ray emission of Ark 120. XMM-Newton, NuSTAR, and the importance of taking the broad view

AU - Matt, G.

AU - Marinucci, A.

AU - Guainazzi, M.

AU - Brenneman, L. W.

AU - Elvis, M.

AU - Lohfink, A.

AU - Arevalo, P.

AU - Boggs, S. E.

AU - Cappi, M.

AU - Christensen, Finn Erland

AU - Craig, W. W.

AU - Fabian, A. C.

AU - Fuerst, F.

AU - Hailey, C. J.

AU - Harrison, F. A.

AU - Parker, M.

AU - Reynolds, J. C.

AU - Stern, D.

AU - Walton, D. J.

AU - Zhang, W. W.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - ASTRONOMY

KW - ACTIVE GALACTIC NUCLEI

KW - BLACK-HOLE SPIN

KW - LINE REGION SIZES

KW - SUZAKU OBSERVATIONS

KW - CENTRAL MASSES

KW - SKY SURVEY

KW - SPECTRA

KW - EXCESS

KW - PHOTOIONIZATION

KW - SEYFERT-1

KW - accretion, accretion discs

KW - galaxies: active

KW - galaxies: individual: Ark 120

U2 - 10.1093/mnras/stu159

DO - 10.1093/mnras/stu159

M3 - Journal article

SN - 0035-8711

VL - 439

SP - 3016

EP - 3021

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

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

Abstract

Keywords

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