Abstract
We conducted a multi-wavelength 6-month campaign to observe the Seyfert Galaxy NGC 7469, using the space-based observatories HST, Swift, XMM-Newton and NuSTAR. We report the results of the spectral analysis of the seven simultaneous XMM-Newton and NuSTAR observations. The source shows significant flux variability within each observation, but the average flux is less variable among the different pointings of our campaign. Our spectral analysis reveals a prominent narrow neutral Fe Kα emission line in all the spectra and weaker contributions from Fe Kβ, neutral Ni Kα, and ionized iron. We find no evidence for variability or relativistic effects acting on the emission lines, which indicates that they originate from distant material. In the joint analysis of XMM-Newton and NuSTAR data, a constant photon index is found (Γ = 1.78 ± 0.02) together with a high energy cut-off Ecut = 170+ − 60 40 keV. Adopting a self-consistent Comptonization model, these values correspond to an average coronal electron temperature of kT = 45+ − 15 12 keV and, assuming a spherical geometry, an optical depth τ = 2.6 ± 0.9. The reflection component is consistent with being constant and the reflection fraction is in the range R = 0.3−0.6. A prominent soft excess dominates the spectra below 4 keV. This is best fit with a second Comptonization component, arising from a warm corona with an average kT = 0.67 ± 0.03 keV and a corresponding optical depth τ = 9.2 ± 0.2.
| Original language | English |
|---|---|
| Article number | A163 |
| Number of pages | 10 |
| Journal | Astronomy and Astrophysics |
| Volume | 615 |
| Early online date | 1 Aug 2018 |
| DOIs | |
| Publication status | E-pub ahead of print - 1 Aug 2018 |
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Keywords
- active
- galaxies
- quasars
- X-rays
- Seyfert galaxy
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Multi-wavelength campaign on NCG 7469 IV. The broad-band X-ray spectrum. / Middei, R.; Bianchi, S.; Cappi, M.; Petrucci, P.-O.; Ursini, F.; Arav, N.; Behar, E.; Branduardi-Raymont, G.; Costantini, E.; De Marco, B.; Di Gesu, L.; Ebrero, J.; Kaastra, J.; Kaspi, S.; Kriss, G. A.; Mao, J.; Mehdipour, M.; Paltani, S.; Peretz, U.; Ponti, G.
In: Astronomy and Astrophysics, Vol. 615, A163, 01.08.2018.Research output: Contribution to journal › Article
TY - JOUR
T1 - Multi-wavelength campaign on NCG 7469 IV. The broad-band X-ray spectrum
AU - Middei, R.
AU - Bianchi, S.
AU - Cappi, M.
AU - Petrucci, P.-O.
AU - Ursini, F.
AU - Arav, N.
AU - Behar, E.
AU - Branduardi-Raymont, G.
AU - Costantini, E.
AU - De Marco, B.
AU - Di Gesu, L.
AU - Ebrero, J.
AU - Kaastra, J.
AU - Kaspi, S.
AU - Kriss, G. A.
AU - Mao, J.
AU - Mehdipour, M.
AU - Paltani, S.
AU - Peretz, U.
AU - Ponti, G.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - We conducted a multi-wavelength 6-month campaign to observe the Seyfert Galaxy NGC 7469, using the space-based observatories HST, Swift, XMM-Newton and NuSTAR. We report the results of the spectral analysis of the seven simultaneous XMM-Newton and NuSTAR observations. The source shows significant flux variability within each observation, but the average flux is less variable among the different pointings of our campaign. Our spectral analysis reveals a prominent narrow neutral Fe Kα emission line in all the spectra and weaker contributions from Fe Kβ, neutral Ni Kα, and ionized iron. We find no evidence for variability or relativistic effects acting on the emission lines, which indicates that they originate from distant material. In the joint analysis of XMM-Newton and NuSTAR data, a constant photon index is found (Γ = 1.78 ± 0.02) together with a high energy cut-off Ecut = 170+ − 60 40 keV. Adopting a self-consistent Comptonization model, these values correspond to an average coronal electron temperature of kT = 45+ − 15 12 keV and, assuming a spherical geometry, an optical depth τ = 2.6 ± 0.9. The reflection component is consistent with being constant and the reflection fraction is in the range R = 0.3−0.6. A prominent soft excess dominates the spectra below 4 keV. This is best fit with a second Comptonization component, arising from a warm corona with an average kT = 0.67 ± 0.03 keV and a corresponding optical depth τ = 9.2 ± 0.2.
AB - We conducted a multi-wavelength 6-month campaign to observe the Seyfert Galaxy NGC 7469, using the space-based observatories HST, Swift, XMM-Newton and NuSTAR. We report the results of the spectral analysis of the seven simultaneous XMM-Newton and NuSTAR observations. The source shows significant flux variability within each observation, but the average flux is less variable among the different pointings of our campaign. Our spectral analysis reveals a prominent narrow neutral Fe Kα emission line in all the spectra and weaker contributions from Fe Kβ, neutral Ni Kα, and ionized iron. We find no evidence for variability or relativistic effects acting on the emission lines, which indicates that they originate from distant material. In the joint analysis of XMM-Newton and NuSTAR data, a constant photon index is found (Γ = 1.78 ± 0.02) together with a high energy cut-off Ecut = 170+ − 60 40 keV. Adopting a self-consistent Comptonization model, these values correspond to an average coronal electron temperature of kT = 45+ − 15 12 keV and, assuming a spherical geometry, an optical depth τ = 2.6 ± 0.9. The reflection component is consistent with being constant and the reflection fraction is in the range R = 0.3−0.6. A prominent soft excess dominates the spectra below 4 keV. This is best fit with a second Comptonization component, arising from a warm corona with an average kT = 0.67 ± 0.03 keV and a corresponding optical depth τ = 9.2 ± 0.2.
KW - active
KW - galaxies
KW - quasars
KW - X-rays
KW - Seyfert galaxy
UR - http://www.scopus.com/inward/record.url?scp=85056656537&partnerID=8YFLogxK
UR - https://arxiv.org/abs/1803.07334
U2 - 10.1051/0004-6361/201832726
DO - 10.1051/0004-6361/201832726
M3 - Article
VL - 615
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - A163
ER -