The hard X-ray emission of X Per
arXiv:1202.6271 · doi:10.1051/0004-6361/201218878
Abstract
We present an analysis of the spectral properties of the peculiar X-ray pulsar X Per based on INTEGRAL observations. We show that the source exhibits an unusually hard spectrum and is confidently detected by ISGRI up to more than 100 keV. We find that two distinct components may be identified in the broadband 4-200 keV spectrum of the source. We interpret these components as the result of thermal and bulk Comptonization in the vicinity of the neutron star and describe them with several semi-phenomenological models. The previously reported absorption feature at ~30 keV is not required in the proposed scenario and therefore its physical interpretation must be taken with caution. We also investigated the timing properties of the source in the framework of existing torque theory, concluding that the observed phenomenology can be consistently explained if the magnetic field of the neutron star is ~10^14 G.
arXiv commentPublished as a letter in A&A; 4 pages, 2 figures
References in corpus (11)
- Thermal and Bulk Comptonization in Accretion-Powered X-Ray Pulsars
- The Orbit of X Per and Its Neutron Star Companion
- A new Comptonization model for low-magnetized accreting neutron stars in low mass X-ray binaries
- Discovery of a Cyclotron Resonant Scattering Feature in the RXTE Spectrum of 4U 0352+309 (X Per)
- Is there a highly magnetized neutron star in GX 301-2?
- Evidence for a Neutron Star in the non-pulsating massive X-ray binary 4U2206+54
- Discovery of slow X-ray pulsations in the high-mass X-ray binary 4U 2206+54
- The Energy Spectrum of Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters
- Spin-Down of the Long-Period Accreting Pulsar 4U 2206+54
- Spectral Formation in X-Ray Pulsar Accretion Columns
- A Potential Cyclotron Line Signature in Low Luminosity X-Ray Sources
Cited by in corpus (38)
- Cyclotron lines in highly magnetized neutron stars
- High-Mass X-ray Binaries in the Milky Way: A closer look with INTEGRAL
- Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
- Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state
- An accretion model for the anomalous X-ray pulsar 4U 0142+61
- Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262
- Strong outburst activity of the X-ray pulsar X Persei during 2001-2011
- Accreting magnetars: a new type of high-mass X-ray binaries?
- Magnetic fields of neutron stars in X-ray binaries
- Spectrum formation in X-ray pulsars at very low mass accretion rate: Monte-Carlo approach
- X-ray emission from magnetized neutron star atmospheres at low mass accretion rates. I. Phase-averaged spectrum
- X-ray polarimetry of X-ray pulsar X Persei: another orthogonal rotator?
- Discovery of 47-s pulsations in the X-ray source 1RXS J225352.8+624354
- SRG/ART-XC and NuSTAR observations of the X-ray pulsar GRO J1008-57 in the lowest luminosity state
- SGR 07552933: a new High Mass X-ray binary with the wrong name
- INTEGRAL 11-year hard X-ray survey above 100 keV
- Continuum, cyclotron line, and absorption variability in the high-mass X-ray binary Vela X-1
- RX J0440.9+4431: another supercritical X-ray pulsar
- An application of the Ghosh & Lamb model to the accretion powered X-ray pulsar X Persei
- Understanding the nature of the intriguing source X Persei: A deep look with a Suzaku observation
- An observational argument against accretion in magnetars
- SRGA J124404.1-632232/SRGU J124403.8-632231: a new X-ray pulsar discovered in the all-sky survey by SRG
- Spectral and temporal properties of the supergiant fast X-ray transient IGR J18483-0311 observed by INTEGRAL
- A Suzaku View of Accretion Powered X-ray Pulsar GX 1+4
- Spectral observations of X Persei: Connection between H-alpha and X-ray emission
- Observations of GRO J1744-28 in quiescence with XMM-Newton
- The X-ray pulsar XTE J1858+034 observed with NuSTAR and Fermi/GBM: spectral and timing characterization plus a cyclotron line
- A high-mass X-ray binary pulsar 4U 1907+09 with multiple absorption-line features in the spectrum
- X-Ray Views of Galactic Accreting Pulsars in High-Mass X-Ray Binaries
- SRG/ART-XC, Swift, NICER and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531
- Observational constraints on the magnetic field of the bright transient Be/X-ray pulsar SXP 4.78
- Discovery of a bimodal luminosity distribution in persistent Be/X-ray pulsar 2RXP J130159.6-635806
- Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013
- Spectral evolution of X-ray pulsar 4U 1901+03 during the 2019 outburst based on Insight-HXMT and NuSTAR observations
- A study of the accretion mechanisms of the High Mass X-ray Binary IGR J00370+6122
- Probing the emission mechanism and nature of the pulsating compact object in the X-ray binary SAX J1324.4-6200
- Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter
- Spectral and Timing properties of the recently discovered Be/X-ray pulsar eRASSUJ 052914.9-662446