Multi-wavelength campaign on NGC 7469 VI. photoionisation modelling of the emission line regions and the warm absorber

S. Grafton-Waters, G. Branduardi-Raymont, M. Mehdipour, M. J. Page, E. Behar, J. Kaastra, N. Arav, S. Bianchi, E. Costantini, J. Ebrero, L. Di Gesu, S. Kaspi, G. A. Kriss, B. De Marco, J. Mao, R. Middei, U. Peretz, P. -O. Petrucci, G. Ponti

Research output: Contribution to journalArticle

Abstract

Aims. We aim to investigate and characterise the photoionised X-ray emission line regions within NGC 7469. Methods. We apply the photoionisation model, PION, within the spectral fitting code SPEX to analyse the 640 ks RGS spectrum of NGC 7469 gathered during an XMM-Newton observing campaign in 2015. Results. We find the emission line region in NGC 7469 to be multiphased, consisting of two narrow components with ionisation parameters of $\log \xi = 0.4$ and 1.6. A third, broad emission component, with a broadening velocity of $v_b \sim 1400$ km s\textsuperscript{-1} and an outflow velocity of $v_{out} \sim -4500$ km s\textsuperscript{-1}, is required to fit the residuals in the O VII triplet, at around 22 \AA. Assuming a volume filling factor of 0.1, the lower distance limits of the narrow emission line region components are estimated for the first time at 2.6 and 2.5 pc from the central black hole, whereas the broad component has an estimated lower bound distance between 0.004 to 0.03 pc, depending on the assumed plasma parameters. The collisionally ionised plasma from the star burst region in NGC 7469 has a plasma temperature of 0.32 keV and outflow velocity of $-280$ km s\textsuperscript{-1}, consistent with previous results in this campaign. In addition, we model the photoionised plasma of the warm absorber (WA) in NGC 7469, and find that it consists of three photoionised phases, with different values of $\xi$, $N_H$ and $v_{out}$. The upper bound distances of these WA components are 1.9, 0.3 and 0.6 pc, respectively, consistent with archival results. Conclusions. The environment of NGC 7469 is a complex mix of plasma winds absorbing and emitting X-rays. We find the picture painted by our results can be attributed to line emitting plasma located at distances ranging from near the black hole to the torus and beyond the ionised outflows.
Original languageEnglish
Article numberA62
Number of pages17
JournalAstronomy and Astrophysics
Volume633
DOIs
Publication statusPublished - 10 Jan 2020

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photoionization
absorbers
wavelength
plasma
wavelengths
modeling
outflow
plasma temperature
XMM-Newton telescope
newton
bursts
x rays
ionization
stars
temperature
parameter

Keywords

  • astrophyics
  • galaxies
  • galaxies x-rays

Cite this

Grafton-Waters, S., Branduardi-Raymont, G., Mehdipour, M., Page, M. J., Behar, E., Kaastra, J., ... Ponti, G. (2020). Multi-wavelength campaign on NGC 7469 VI. photoionisation modelling of the emission line regions and the warm absorber. Astronomy and Astrophysics, 633, [A62]. https://doi.org/10.1051/0004-6361/201935815
Grafton-Waters, S. ; Branduardi-Raymont, G. ; Mehdipour, M. ; Page, M. J. ; Behar, E. ; Kaastra, J. ; Arav, N. ; Bianchi, S. ; Costantini, E. ; Ebrero, J. ; Gesu, L. Di ; Kaspi, S. ; Kriss, G. A. ; Marco, B. De ; Mao, J. ; Middei, R. ; Peretz, U. ; Petrucci, P. -O. ; Ponti, G. / Multi-wavelength campaign on NGC 7469 VI. photoionisation modelling of the emission line regions and the warm absorber. In: Astronomy and Astrophysics. 2020 ; Vol. 633.
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abstract = "Aims. We aim to investigate and characterise the photoionised X-ray emission line regions within NGC 7469. Methods. We apply the photoionisation model, PION, within the spectral fitting code SPEX to analyse the 640 ks RGS spectrum of NGC 7469 gathered during an XMM-Newton observing campaign in 2015. Results. We find the emission line region in NGC 7469 to be multiphased, consisting of two narrow components with ionisation parameters of $\log \xi = 0.4$ and 1.6. A third, broad emission component, with a broadening velocity of $v_b \sim 1400$ km s\textsuperscript{-1} and an outflow velocity of $v_{out} \sim -4500$ km s\textsuperscript{-1}, is required to fit the residuals in the O VII triplet, at around 22 \AA. Assuming a volume filling factor of 0.1, the lower distance limits of the narrow emission line region components are estimated for the first time at 2.6 and 2.5 pc from the central black hole, whereas the broad component has an estimated lower bound distance between 0.004 to 0.03 pc, depending on the assumed plasma parameters. The collisionally ionised plasma from the star burst region in NGC 7469 has a plasma temperature of 0.32 keV and outflow velocity of $-280$ km s\textsuperscript{-1}, consistent with previous results in this campaign. In addition, we model the photoionised plasma of the warm absorber (WA) in NGC 7469, and find that it consists of three photoionised phases, with different values of $\xi$, $N_H$ and $v_{out}$. The upper bound distances of these WA components are 1.9, 0.3 and 0.6 pc, respectively, consistent with archival results. Conclusions. The environment of NGC 7469 is a complex mix of plasma winds absorbing and emitting X-rays. We find the picture painted by our results can be attributed to line emitting plasma located at distances ranging from near the black hole to the torus and beyond the ionised outflows.",
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author = "S. Grafton-Waters and G. Branduardi-Raymont and M. Mehdipour and Page, {M. J.} and E. Behar and J. Kaastra and N. Arav and S. Bianchi and E. Costantini and J. Ebrero and Gesu, {L. Di} and S. Kaspi and Kriss, {G. A.} and Marco, {B. De} and J. Mao and R. Middei and U. Peretz and Petrucci, {P. -O.} and G. Ponti",
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Grafton-Waters, S, Branduardi-Raymont, G, Mehdipour, M, Page, MJ, Behar, E, Kaastra, J, Arav, N, Bianchi, S, Costantini, E, Ebrero, J, Gesu, LD, Kaspi, S, Kriss, GA, Marco, BD, Mao, J, Middei, R, Peretz, U, Petrucci, P-O & Ponti, G 2020, 'Multi-wavelength campaign on NGC 7469 VI. photoionisation modelling of the emission line regions and the warm absorber', Astronomy and Astrophysics, vol. 633, A62. https://doi.org/10.1051/0004-6361/201935815

Multi-wavelength campaign on NGC 7469 VI. photoionisation modelling of the emission line regions and the warm absorber. / Grafton-Waters, S.; Branduardi-Raymont, G.; Mehdipour, M.; Page, M. J.; Behar, E.; Kaastra, J.; Arav, N.; Bianchi, S.; Costantini, E.; Ebrero, J.; Gesu, L. Di; Kaspi, S.; Kriss, G. A.; Marco, B. De; Mao, J.; Middei, R.; Peretz, U.; Petrucci, P. -O.; Ponti, G.

In: Astronomy and Astrophysics, Vol. 633, A62, 10.01.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Multi-wavelength campaign on NGC 7469 VI. photoionisation modelling of the emission line regions and the warm absorber

AU - Grafton-Waters, S.

AU - Branduardi-Raymont, G.

AU - Mehdipour, M.

AU - Page, M. J.

AU - Behar, E.

AU - Kaastra, J.

AU - Arav, N.

AU - Bianchi, S.

AU - Costantini, E.

AU - Ebrero, J.

AU - Gesu, L. Di

AU - Kaspi, S.

AU - Kriss, G. A.

AU - Marco, B. De

AU - Mao, J.

AU - Middei, R.

AU - Peretz, U.

AU - Petrucci, P. -O.

AU - Ponti, G.

PY - 2020/1/10

Y1 - 2020/1/10

N2 - Aims. We aim to investigate and characterise the photoionised X-ray emission line regions within NGC 7469. Methods. We apply the photoionisation model, PION, within the spectral fitting code SPEX to analyse the 640 ks RGS spectrum of NGC 7469 gathered during an XMM-Newton observing campaign in 2015. Results. We find the emission line region in NGC 7469 to be multiphased, consisting of two narrow components with ionisation parameters of $\log \xi = 0.4$ and 1.6. A third, broad emission component, with a broadening velocity of $v_b \sim 1400$ km s\textsuperscript{-1} and an outflow velocity of $v_{out} \sim -4500$ km s\textsuperscript{-1}, is required to fit the residuals in the O VII triplet, at around 22 \AA. Assuming a volume filling factor of 0.1, the lower distance limits of the narrow emission line region components are estimated for the first time at 2.6 and 2.5 pc from the central black hole, whereas the broad component has an estimated lower bound distance between 0.004 to 0.03 pc, depending on the assumed plasma parameters. The collisionally ionised plasma from the star burst region in NGC 7469 has a plasma temperature of 0.32 keV and outflow velocity of $-280$ km s\textsuperscript{-1}, consistent with previous results in this campaign. In addition, we model the photoionised plasma of the warm absorber (WA) in NGC 7469, and find that it consists of three photoionised phases, with different values of $\xi$, $N_H$ and $v_{out}$. The upper bound distances of these WA components are 1.9, 0.3 and 0.6 pc, respectively, consistent with archival results. Conclusions. The environment of NGC 7469 is a complex mix of plasma winds absorbing and emitting X-rays. We find the picture painted by our results can be attributed to line emitting plasma located at distances ranging from near the black hole to the torus and beyond the ionised outflows.

AB - Aims. We aim to investigate and characterise the photoionised X-ray emission line regions within NGC 7469. Methods. We apply the photoionisation model, PION, within the spectral fitting code SPEX to analyse the 640 ks RGS spectrum of NGC 7469 gathered during an XMM-Newton observing campaign in 2015. Results. We find the emission line region in NGC 7469 to be multiphased, consisting of two narrow components with ionisation parameters of $\log \xi = 0.4$ and 1.6. A third, broad emission component, with a broadening velocity of $v_b \sim 1400$ km s\textsuperscript{-1} and an outflow velocity of $v_{out} \sim -4500$ km s\textsuperscript{-1}, is required to fit the residuals in the O VII triplet, at around 22 \AA. Assuming a volume filling factor of 0.1, the lower distance limits of the narrow emission line region components are estimated for the first time at 2.6 and 2.5 pc from the central black hole, whereas the broad component has an estimated lower bound distance between 0.004 to 0.03 pc, depending on the assumed plasma parameters. The collisionally ionised plasma from the star burst region in NGC 7469 has a plasma temperature of 0.32 keV and outflow velocity of $-280$ km s\textsuperscript{-1}, consistent with previous results in this campaign. In addition, we model the photoionised plasma of the warm absorber (WA) in NGC 7469, and find that it consists of three photoionised phases, with different values of $\xi$, $N_H$ and $v_{out}$. The upper bound distances of these WA components are 1.9, 0.3 and 0.6 pc, respectively, consistent with archival results. Conclusions. The environment of NGC 7469 is a complex mix of plasma winds absorbing and emitting X-rays. We find the picture painted by our results can be attributed to line emitting plasma located at distances ranging from near the black hole to the torus and beyond the ionised outflows.

KW - astrophyics

KW - galaxies

KW - galaxies x-rays

UR - https://arxiv.org/abs/1907.01946

U2 - 10.1051/0004-6361/201935815

DO - 10.1051/0004-6361/201935815

M3 - Article

VL - 633

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A62

ER -