INTEGRAL observations of Her X-1
arXiv:0802.1168 · doi:10.1051/0004-6361:20078953
Abstract
Aims: We investigate the X-ray spectral and timing properties of the accreting X-ray pulsar Her X-1 observed with the INTEGRAL satellite in July-August 2005. Methods: The data analyzed in this work cover a substantial part of one main-on state of the source. The short-time scale pulse period development is measured. X-ray pulse profiles for different energy ranges and time intervals are constructed. Pulse-averaged and pulse-phase resolved broad band X-ray spectra are studied. Spectral changes during X-ray dips are explored. Results: The X-ray pulse profiles are found to change significantly during the period of observations. For the first time a strong spinup is measured within one 35 d cycle. Spectral characteristics observed during the X-ray dips are consistent with their interpretaion as due to partial covering as has been reported by several authors. The fundamental cyclotron absorption line is firmly observed in both pulse-averaged and pulse-phase resolved X-ray spectra. The energy, width, and the depth of the line are found to vary significantly with pulse phase.
9 pages, 10 figures, accepted for publication in A&A on 29/01/2008
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- The INTEGRAL Science Data Centre (ISDC)
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- Updating the orbital ephemeris of Her X-1; rate of decay and eccentricity of the orbit
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- Energy-Dependent Harmonic Ratios of the Cyclotron Features of X0331+53 in the 2004-2005 Outburst
- The Be/X-ray Binary Swift J1626.6-5156 as a Variable Cyclotron Line Source
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- Polarisation of Accreting X-ray Pulsars. II. Hercules X-1
- The cyclotron line energy in Her X-1: stable after the decay
- Continuous monitoring of pulse period variations in Her X-1 using Swift/BAT
- Long-term Hard X-ray Monitoring of 2S 0114+65 with INTEGRAL/IBIS
- Understanding the nature of the intriguing source X Persei: A deep look with a Suzaku observation
- AstroSat observations of GRO J2058+42 during the 2019 outburst
- Swift/BAT measurements of the cyclotron line energy decay in the accreting neutron star Her X-1: indication of an evolution of the magnetic field?
- Cyclotron line signatures of thermal and magnetic mountains from accreting neutron stars
- Observations of Her X-1 in low states during SRG/eROSITA all-sky survey
- Spectral and timing analysis of BeXRB eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC)
- Studies of Cepheus X-4 during 2018 outburst observed with AstroSat