High-Resolution X-ray Spectroscopy of AGN Warm Absorbers

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High-Resolution X-ray Spectroscopy of AGN Warm
Absorbers

• Rebecca Smith
• MSSL, UCL
• with G. Branduardi-Raymont and M. Page

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Aims

• Studying a variety of AGN warm absorbers
• Comparison offers clues to dynamics, chemical
  composition, physical structure and origin
• High-resolution soft X-ray spectra vital
  diagnostic tool
• Three objects presented today, focussing on data
  from XMM-Newton RGS

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Objects

• Very high luminosity Seyfert 1
• L2-10keV 1.3-2.6x1044erg s-1
• Galactic NH4.4x1020cm-2

• Markarian 509
• Seyfert 1
• z0.034

• Bright X-ray NLS1
• L2-10keV 2.4x1043erg s-1
• Galactic NH6.4x1020cm-2

• Arakelian 564
• NLS1
• z0.025

• 1H 0707-495
• NLS1
• z0.041

• Spectral variation between observations
• L2-10keV 8x1042-3x1043erg s-1
• Galactic NH5.8x1020cm-2

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Markarian 509

• Phase 1
• log ? 0.890.07
• outflow vel 510200km s-1
• NH 0.79x1021cm-2
• Phase 2
• log ? 2.140.08
• outflow vel 260120km s-1
• NH 0.75x1021cm-2
• Phase 3
• log ? 3.260.03
• outflow vel 60100km s-1
• NH 5.50x1021cm-2

Flux (photons m-2s-1Å-1)
Smith et al. 2007
Wavelength (Å)
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Thermal Stability Graph
Pressure form ionization parameter
X 0.96110-4 x T
Phases with the same value of X can be in
pressure equilibrium and so exist within the same
cloud
Smith et al. 2007
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Arakelian 564

• Phase 1
• log ? 0.290.20
• outflow vel 1090km s-1
• Col Dens 0.31x1021cm-2
• Phase 2
• log ? 2.560.09
• outflow vel 20100km s-1
• Col Dens 0.71x1021cm-2
• Narrow emission lines from OVIII and NVII with
  outflow velocity 500km s-1

Flux (photons m-2s-1Å-1)
Smith et al. in prep
Wavelength (Å)
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1H 0707-495

• Spectral changes between 2000 observation (black)
  and 2002 observation (red)?
• Shift in energy of large feature at 7keV?

XMM-Newton EPIC PN
2002
2000
Normalized counts /s / keV
Gallo et al. 2004
Energy (keV)?
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XMM-Newton RGS
1H 0707-495
20022
2000
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1H 0707-495
2002

• Two features, with 8 energy shift
• Change in ionization or velocity?

2000
1H 0707-495
Smith et al. in prep
2002
2000
Gallo et al. 2004
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XMM-Newton RGS
1H 0707-495
2000
2002
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XMM-Newton RGS
Markarian 509
Arakelian 564
Counts m-2s-1Å-1
1H 0707-495 2002
1H 0707-495 2000
10 15 20
25 30 35
Wavelength (Å)
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Conclusions

• Have analysed three Seyfert 1s with
  high-resolution soft X-ray spectra
• Interesting diversity of characteristics in
  outflows and emission features
• Connected UV and X-ray absorbers in Mrk 509 and
  Ark 564
• Mrk 509 shows strong broad emission lines
  consistent with the optical broad line region
• Ark 564 has a highly ionized absorber with a
  surprisingly low outflow velocity
• 1H 0707-495 shows dramatic soft X-ray spectral
  variability in strength of warm absorber and
  energy of 'shoulder'