Hard Xray characteristics of Anomalous Xray Pulsars

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Hard X-ray characteristics of Anomalous X-ray
Pulsars

• Lucien Kuiper, Wim Hermsen,
• Peter den Hartog
• SRON - Netherlands Institute for Space Research
• Utrecht, The Netherlands

Neutron Stars at the crossroads, Vancouver,
August 11, 2005
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Anomalous X-ray pulsars are hard X-ray sources
X-ray Gamma-ray pulsed spectra AXPs gt 10 keV
Young Pulsars
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Anomalous X-ray pulsars are hard X-ray sources
E hard tail gt E rotation power
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INTEGRAL IBIS-ISGRI Imager onboard INTEGRAL
Spacecraft
Energy range 18 keV - 300 keV Field of view
9o x 9o (fully coded) 19o x 19o
(partially coded) Angular resolution 12
(FWHM) Point source location accuracy 30
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Hard AXPs detected gt 10 keV

• 1E 1841-045 (Molkov et al. 2004),
• (Kuiper, Hermsen Mendez 2004)
• 1RXS J170849-400910 (Revnivtsev et al. 2004),
• (Kuiper et al. 2005 in prep)
• 4U 0142614 (den Hartog et al. 2004),
• (den Hartog et al. 2005 in prep),
• (Kuiper et al. 2005 in prep)
• 1E 2259586 (Kuiper et al. 2005 in prep)

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4U 0142614 w. INTEGRAL IBIS-ISGRI
4U 0142614 RX 0146.96121
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4U 0142614pulse profile as function of Energy
Kuiper, Hermsen den Hartog in prep
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4U 0142614 - Spectrum
Spectrum must break
RXTE PCA (pulsed) Gs 4.1 Gh -0.8
INTEGRAL (total) G 1.05
Pulsed fraction 100 gt 50 keV
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1E 1841-045 (SNR Kes 73)
Spectrum must break
INTEGRAL (total) G 1.32
RXTE HEXTE (pulsed) G 0.94
Pulsed fraction 100 gt 50 keV
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1E 1841-045 pulse profiles
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INTEGRAL pulse profiles
5.7s
3.0s
1RXS J170849-400910
1E 1841-045
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1E 2259586
1RXS 170849.0-400910
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Anomalous X-ray pulsars are hard X-ray sources
New energy window gt10 keV 4 AXPs with hard
tails Magnetospheric origin, not rotation
powered Spectral breaks expected
Connections? Young radio pulsars Vela
pulsar Black-body spectrum
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4U 0142614 IR Hard X-ray
Possible link? IR hard X-rays
Vela pulsar similarity pulsed optical g rays
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Remember AXPs are hard X-ray sources!
Contact Hartog_at_sron.nl