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 language | English |
|---|---|
| Pages (from-to) | L15-L19 |
| Number of pages | 5 |
| Journal | Monthly Notices of the Royal Astronomical Society: Letters |
| Volume | 374 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 2007 |
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Keywords
- Accretion, accretion discs
- Atomic processes
- Galaxies: active
- Line: profiles
- X-rays: galaxies
Cite this
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The iron K feature in narrow line Seyfert 1 galaxies : Evidence for a P Cygni profile? / Done, Chris; Sobolewska, Małgorzata A.; Gierliński, Marek; Schurch, Nicholas J. (Lead / Corresponding author).
In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 374, No. 1, 01.01.2007, p. L15-L19.Research output: Contribution to journal › Letter
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
UR - http://www.scopus.com/inward/record.url?scp=33847019531&partnerID=8YFLogxK
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 -