INTEGRAL observations of the Crab pulsar

Abstract

The paper presents the timing and spectral analysis of several observations of the Crab pulsar performed with INTEGRAL in the energy range 3-500 keV. All these observations, when summed together provide a high statistics data set which can be used for accurate phase resolved spectroscopy. A detailed study of the pulsed emission at different phase intervals is performed. The spectral distribution changes with phase showing a characteristic reverse S shape of the photon index. Moreover the spectrum softens with energy, in each phase interval, and this behavior is adequately modeled over the whole energy range 3-500 keV with a single curved law with a slope variable with Log(E), confirming the BeppoSAX results on the curvature of the pulsed emission. The bending parameter of the log-parabolic model is compatible with a single value of 0.14+/-0.02 over all phase intervals. Results are discussed within the three-dimensional outer gap model.

10 pages, 7 figures, accepted by Astronomy and Astrophysics

References in corpus (18)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Log-parabolic spectra and particle acceleration in the BL Lac object Mkn 421: spectral analysis of the complete BeppoSAX wide band X-ray data set
• The INTEGRAL/IBIS Scientific Data Analysis
• The Crab pulsar in the 0.75-30 MeV range as seen by CGRO COMPTEL
• Log-parabolic spectra and particle acceleration in blazars - II: The BeppoSAX wide band X-ray spectra of Mkn 501
• The INTEGRAL IBIS/ISGRI System Point Spread Function and Source Location Accuracy
• Chandra Phase-Resolved Spectroscopy of the Crab Pulsar
• Absolute Timing of the Crab Pulsar with RXTE
• IBIS/PICsIT in-flight performances
• The Spiros imaging software for the Integral SPI spectrometer
• RXTE Observation of Cygnus X-1: Spectral Analysis
• Absolute timing with IBIS, SPI and JEM-X aboard INTEGRAL
• Chandra Phase-Resolved X-ray Spectroscopy of the Crab Pulsar II
• Hard X-ray timing and spectral properties of PSR B0540-69
• INTEGRAL timing and localization performance
• Accretion column disruption in GX 1+4
• The X-ray emission of the Crab-like pulsar PSR J0537-6910
• A review of x-ray spectral evolution in Crab pulsar

Cited by in corpus (22)

• In-Orbit Performance of the Hard X-ray Detector on board Suzaku
• Fermi Large Area Telescope Observations of the Crab Pulsar and Nebula
• Timing Characteristics of the Hard X-ray Emission from Bright X-ray Pulsars Based on INTEGRAL Data
• 4U 0115+63 from RXTE and INTEGRAL Data: Pulse Profile and Cyclotron Line Energy
• A 0535+26 in the August/September 2005 outburst observed by RXTE and INTEGRAL
• INTEGRAL observations of Her X-1
• Strong outburst activity of the X-ray pulsar X Persei during 2001-2011
• Giant outburst of EXO 2030+375: pulse-phase resolved analysis of INTEGRAL data
• INTEGRAL observation of the accreting pulsar GX 1+4
• The optical to gamma-ray emission of the Crab pulsar: a multicomponent model
• High-energy Emission from Pulsar Outer Magnetospheres
• High Energy Emission from Rotation-Powered Pulsars: Outer-gap vs. Slot-gap Models
• Search for a correlation between very-high-energy gamma rays and giant radio pulses in the Crab pulsar
• The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars
• 2003-2019 Monitoring of the Crab emission through INTEGRAL SPI, or vice versa
• An online data analysis system of INTEGRAL telescope
• Insight-HXMT observations of the Crab pulsar
• Pulse profile stability of the Crab pulsar
• Precise timing and phase-resolved spectroscopy of the young pulsar J1617-5055 with NuSTAR
• Phase-resolved gamma-ray spectroscopy of the Crab pulsar observed by POLAR
• A Study on the X-Ray Pulse Profile and Spectrum of the Crab Pulsar Using NICER and Insight-HXMT's Observations
• Simulated Gamma-Ray Pulse Profile of the Crab Pulsar with the Cherenkov Telescope Array