Timing and Spectral Study of IGR J19294+1816 with RXTE: Discovery of Cyclotron Feature

Abstract

Rossi X-ray Timing Explorer (RXTE)/Proportional Counter Array (PCA) observations of IGR J19294+1816 covering two outburst episodes are reported. The first outburst happened during MJD 54921-54925 (2009 C.E.) and the second one happened during MJD 55499-55507 (2010 C.E.). In both the cases the PCA observations were made during the decay phase of the outburst, with the source exhibiting temporal and spectral evolution with the change in flux. At the bright flux level an absorption feature at 35.5 keV is detected in the spectra which may be attributed to Cyclotron Resonance Scattering Feature corresponding to a magnetic field of B = 4.13*10^12 Gauss. This is also detected at a lower significance in two other observations. In addition an Fe line emission at 6.4 keV is prominently detected during the highest flux. X-ray pulsations are detected in 9 out of 10 observations; no pulsations were found in the observation with the lowest flux level. During this observation with the lowest flux the pulsation phenomenon becomes detectable only at the soft X-ray bands.

References in corpus (10)

• Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array
• The Swift/BAT Hard X-ray Transient Monitor
• Gravitationally redshifted absorption lines in the X-ray burst spectra of a neutron star
• Particle Acceleration Zones Above Pulsar Polar Caps: Electron and Positron Pair Formation Fronts
• RXTE Measurement of the Diffuse X-ray Emission From the Galactic Ridge: Implications for the Energetics of the Interstellar Medium
• Patterns of variability in Be/X-ray pulsars during giant outbursts
• X-ray Flux Related Timing and Spectral Features of 2S 1417-62
• The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations
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• RXTE-PCA Observations of XMMU J054134.7-682550

Cited by in corpus (4)

• Cyclotron lines in highly magnetized neutron stars
• Study of the X-ray pulsar IGR J19294+1816 with NuSTAR: detection of cyclotron line and transition to accretion from the cold disc
• Inferring the Equation of State from Neutron Star Observables via Machine Learning
• Evolution implications of neutron star magnetic fields: inferred from pulsars and cyclotron lines of HMXBs