The iron K feature in narrow line Seyfert 1 galaxies

Evidence for a P Cygni profile?

Chris Done, Małgorzata A. Sobolewska, Marek Gierliński, Nicholas J. Schurch (Lead / Corresponding author)

Research output: Contribution to journalLetter

29 Citations (Scopus)

Abstract

Narrow line Seyfert 1 galaxies are generally accreting at high fractions of the Eddington limit. They can show complex X-ray spectra, with a strong 'soft excess' below 2 keV and a sharp drop at ~7 keV. There is strong evidence linking the soft excess to either reflection or absorption from relativistic, partially ionized material close to the black hole. The reflection models can also simultaneously produce the 7-keV feature from fluorescent iron Kα line emission from the disc. Here we show that absorption can also produce a sharp feature at 7 keV from the P Cygni profile which results from absorption/scattering/emission of He- and H-like iron Kα resonance lines in the wind. We demonstrate this explicitly by fitting the iron feature seen in XMM-Newtondata from1H0707-495toa PCygni profile. The resulting column and ionization requiredtoproduce this feature are probably larger than those needed to produce the soft excess. Nonetheless, the absorbing material could still be a single structure with stratified ionization such as that produced by the ionization instability.

Original languageEnglish
Pages (from-to)L15-L19
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume374
Issue number1
DOIs
Publication statusPublished - 1 Jan 2007

Fingerprint

ionization
galaxies
iron
profiles
K lines
XMM-Newton telescope
resonance lines
scattering
x rays
material

Keywords

  • Accretion, accretion discs
  • Atomic processes
  • Galaxies: active
  • Line: profiles
  • X-rays: galaxies

Cite this

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title = "The iron K feature in narrow line Seyfert 1 galaxies: Evidence for a P Cygni profile?",
abstract = "Narrow line Seyfert 1 galaxies are generally accreting at high fractions of the Eddington limit. They can show complex X-ray spectra, with a strong 'soft excess' below 2 keV and a sharp drop at ~7 keV. There is strong evidence linking the soft excess to either reflection or absorption from relativistic, partially ionized material close to the black hole. The reflection models can also simultaneously produce the 7-keV feature from fluorescent iron Kα line emission from the disc. Here we show that absorption can also produce a sharp feature at 7 keV from the P Cygni profile which results from absorption/scattering/emission of He- and H-like iron Kα resonance lines in the wind. We demonstrate this explicitly by fitting the iron feature seen in XMM-Newtondata from1H0707-495toa PCygni profile. The resulting column and ionization requiredtoproduce this feature are probably larger than those needed to produce the soft excess. Nonetheless, the absorbing material could still be a single structure with stratified ionization such as that produced by the ionization instability.",
keywords = "Accretion, accretion discs, Atomic processes, Galaxies: active, Line: profiles, X-rays: galaxies",
author = "Chris Done and Sobolewska, {Małgorzata A.} and Marek Gierliński and Schurch, {Nicholas J.}",
year = "2007",
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doi = "10.1111/j.1745-3933.2006.00255.x",
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TY - JOUR

T1 - The iron K feature in narrow line Seyfert 1 galaxies

T2 - Evidence for a P Cygni profile?

AU - Done, Chris

AU - Sobolewska, Małgorzata A.

AU - Gierliński, Marek

AU - Schurch, Nicholas J.

PY - 2007/1/1

Y1 - 2007/1/1

N2 - Narrow line Seyfert 1 galaxies are generally accreting at high fractions of the Eddington limit. They can show complex X-ray spectra, with a strong 'soft excess' below 2 keV and a sharp drop at ~7 keV. There is strong evidence linking the soft excess to either reflection or absorption from relativistic, partially ionized material close to the black hole. The reflection models can also simultaneously produce the 7-keV feature from fluorescent iron Kα line emission from the disc. Here we show that absorption can also produce a sharp feature at 7 keV from the P Cygni profile which results from absorption/scattering/emission of He- and H-like iron Kα resonance lines in the wind. We demonstrate this explicitly by fitting the iron feature seen in XMM-Newtondata from1H0707-495toa PCygni profile. The resulting column and ionization requiredtoproduce this feature are probably larger than those needed to produce the soft excess. Nonetheless, the absorbing material could still be a single structure with stratified ionization such as that produced by the ionization instability.

AB - Narrow line Seyfert 1 galaxies are generally accreting at high fractions of the Eddington limit. They can show complex X-ray spectra, with a strong 'soft excess' below 2 keV and a sharp drop at ~7 keV. There is strong evidence linking the soft excess to either reflection or absorption from relativistic, partially ionized material close to the black hole. The reflection models can also simultaneously produce the 7-keV feature from fluorescent iron Kα line emission from the disc. Here we show that absorption can also produce a sharp feature at 7 keV from the P Cygni profile which results from absorption/scattering/emission of He- and H-like iron Kα resonance lines in the wind. We demonstrate this explicitly by fitting the iron feature seen in XMM-Newtondata from1H0707-495toa PCygni profile. The resulting column and ionization requiredtoproduce this feature are probably larger than those needed to produce the soft excess. Nonetheless, the absorbing material could still be a single structure with stratified ionization such as that produced by the ionization instability.

KW - Accretion, accretion discs

KW - Atomic processes

KW - Galaxies: active

KW - Line: profiles

KW - X-rays: galaxies

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U2 - 10.1111/j.1745-3933.2006.00255.x

DO - 10.1111/j.1745-3933.2006.00255.x

M3 - Letter

VL - 374

SP - L15-L19

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

SN - 1745-3925

IS - 1

ER -