Broadband Xray spectra of new INTEGRAL AGN

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Broadband X-ray spectra of new INTEGRAL AGN

• FRANCESCA PANESSA
• IFCA - Instituto de Fisica de Cantabria (Spain)
• on behalf of the IBIS survey/AGN team

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- The census of AGN in the Universe may be
still incomplete- Deep X-ray surveys biased
against detecting heavily obscured AGNNeed
to- Quantify the fraction of AGN missed by
surveys to understand the accretion history of
the Universe- Understand the AGN emission
mechanisms by measurements of the primary
continuum spectrum, the high energy cut-off and
reprocessing featuresKey parameters for
estimating the contribution of AGN to the Cosmic
X-ray Background and testing unified theories
The hard X-ray window

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INTEGRAL/IBIS 3rd survey (Bird et al. 2007)
INTEGRAL/IBIS and SWIFT/BATare surveying
complementarily a great fraction of the
sky above 20 keV with a
sensitivity better than a few
mCrab Best sample of AGN selected in the
gamma rays
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New AGN catalogue

• 11300 swc from Rev 46 (Feb 2003) to Rev 369 (Apr
  2005)
• MAPS 20-40, 40-100 keV, 100-150 keV and 150-300
  keV
• 4.5-5s detection limit in various bands lt100
  keV
• 4s detection limit in the 100-150 keV 150-300
  keV

140 AGN detected 18 AGN
detected below 100 keV
above 100 keV
Only 3 AGN detected above 150 keV (Cen A, IGR
J17204-3554, IGR J17488-3253)
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Optical spectroscopy of most likely counterparts

Telescopes Loiano-Bologna Italy, South Africa,
CTIO-Chile, La Silla Chile, CASLEO Argentina
Sey1
Narrow-Line Sey1

A first catalogue of 60 AGN presented in Bassani
et al. 2006 82 Seyferts Sey2/Sey11 Gamma rays
powerfull in finding narrow line objects
Sey2
X-ray bright optically dull AGN
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Characterization of X-ray/gamma-ray spectra
Primary Objectives

• ESTIMATE OF THE COLUMN DENSITY
• DEFINITION OF PRIMARY CONTINUUM (G and Cut-off
  energy)

Secondary Objective study other source features
X-ray Observations SWIFT-XRT
Chandra
XMM ASCA
BeppoSAX/MECS
Gamma-ray Observations INTEGRAL (IBIS)
BeppoSAX (PDS),
when available
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SWIFT/XRT OBSERVATIONS

• 34 IBIS AGN with XRT data
• (Malizia et al. 2007)
• F(2-10)/F(20-100) keV vs Log NH
• Absorbed power law with
• G1.5 (red) and 1.9 (black)
• Peculiar objects are easily recognized
• Compton thick AGNs
• Absorbed type 1 AGNs
• Unabsorbed type 2 AGNs
• If NH gt10 22 at/cm2 is dividing line between
  absorbed unabsorbed AGN then 50 of the
  sample is absorbed.
• At most 10 Compton thick

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Type 2 Seyferts BROAD BAND SPECTRA(De Rosa et
al. in preparation)
Chandra and/or XMM-Newton data INTEGRAL data
Compton thin absorption Low energy cut-off
constrained
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Sample of INTEGRAL type 1 Seyferts
Name Class Redshift Flux 20-100 keV
LEDA 168563 S1 0.029 5e-11 IGR J07597-3842
S1.2 0.04 4e-11 ESO 209-12 S1.5
0.040 2e-11 Fairall 1146 S1.5
0.031 1.5e-11 4U1344-60
S1.5 0.013 6.5e-11 IGR
J16482-3036 S1 0.031 3e-11 IGR J16558-5203
S1 0.054 3e-11 IGR J17418-1212
S1 0.037 3e-11 IGR J18027-1455 S1 0.035
4.5e-11 NO X-RAY SPECTRA BELOW 10 keV
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New XMM-Newton Observations
(Panessa et al. in prep)
XMM-EPIC INTEGRAL-IBIS data fitted with a
simple power law absorbed by the Galactic column
density
ESO 209-G12
F1146 IGR J07597-3842
(?1. 59)
(?1. 53)
(?1. 87)
IGR J17418-1212 IGR
J16558-5203 IGR J18027-1455
(?1. 96)
(?2. 01)
(?1. 35)
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High Energy Cut-off
ESO 209-G12
F1146
(?1. 53)
(?1. 87)
LEDA 168563 IGR
J16482-3036
(?1. 96)
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Spectral Slope and Energy Cut-off
Spectral slope distribution High
Energy cut-off versus Gamma
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Reflection dominated spectra
IGR J18027-1455
IGR J16558-5203
R gt 4.2 Gamma 2.3 EWlt100 eV Consistent values
(Perola et al. 2002) Variability hypothesis not
excluded However XRT and XMM flux consistent!
R 3.12 4.87 2.45 Gamma 1.66 EWlt100 eV
Variability hypothesis or absorption
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Partial covering absorption
IGR J16558 -5203
F1146
Partial covering model NH9.6 1023 cm-2 Cvrt0.80
Partial covering model NH1.3 1022 cm-2 Cvrt0.31
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Spectral Variability
F1146 April 2006 F1146
December 2006
?1.690.04 R lt 2.9 Cut-off lt 84 keV
? 1.490.06 R lt 0.76 Cut-off 39 keV
No flux variability
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Reprocessing features
ESO 209-12 IGR J07597-3842
E(1) 6.28 keV 99 E(2) 6.74 keV 99 E(3) 6.98
keV 95
Narrow Fe EW232 61 -94 eV Sigma 0.3 0.2, 0.6
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Summary of the broadband spectral properties
Name Iron Line Soft Component Cut-off
Reflection LEDA 168563
Y Y Y N IGR J07597-3842 Y Y Y
Y ESO 209-12 Y Y Y UL
Fairall 1146 Y Y Y
UL 4U1344-60 Y N UL
UL IGR J16482-3036 Y N Y N IGR
J16558-5203 Y N UL Y IGR J17418-1212
Y N N Y IGR J18027-1455 Y Y N Y
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Bright Seyfert galaxies discovered by
INTEGRALNow more than 40 newly
optically identified bright AGN that miss X-ray
observation below 10 keV ? need XMM-Newton and
Sukazu!Enlarge the sample and complete the
census of local bright AGN
Summary

Broad band X-ray spectra- Peak at flat
spectral slopes - Constraint on the low energy
cut-off- Correlation between E(cut-off) and
Gamma- Source reflection-dominated- Partial
covering model
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Column Density (whole sample,preliminary)
Nh vs z
Nh vs L 2-10 keV
Green Sey 1 Red Sey 2 Blue Blazars
Nh vs L 2-100 keV
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LX vs z
Green Sey 1 Red Sey 2 Blue Blazars
z 0.001- 2.5 Log (L20-100 ) 41.0-48.0