Long-term change in the cyclotron line energy in Hercules X-1

2014/10/14 by R. Staubert, D. Klochkov, J. Wilms +5 · 3 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Cyclotron #Cyclotron radiation #Cyclotron resonance #Ion cyclotron resonance #Line (geometry) #Phase (matter) #Pulsar #Pulsars and Gravitational Waves Research #Scattering #Spectral line #astro-ph.HE

paper · pdf · doi:10.1051/0004-6361/201424203

published as A&A 572, A119 (2014) · 11 pages, 6 figures, Astronomy & Astrophysics 2014

openalex publication_date 2014/10/14 · arxiv created 2014/11/05 · arxiv updated 2014/12/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

Aims. We investigate the long-term evolution of the cyclotron resonance scattering feature (CRSF) in the spectrum of the binary X-ray pulsar Her X-1 and present evidence of a true long-term decrease in the centroid energy Ecyc of the cyclotron line in the pulse phase averaged spectra from 1996 to 2012.

Citations

• INTEGRAL observations of Hercules X-1
• Discovery of a flux-related change of the cyclotron line energy in Hercules X-1
• Thermal and Bulk Comptonization in Accretion‐powered X‐Ray Pulsars
• A Further Study of the Luminosity‐dependent Cyclotron Resonance Energies of the Binary X‐Ray Pulsar 4U 0115+63 with theRossi X‐Ray Timing Explorer

Cited by

• New measurements of the cyclotron line energy in Cen X-3
• The First NuSTAR Observation of 4U 1538–522: Updated Orbital Ephemeris and a Strengthened Case for an Evolving Cyclotron Line Energy
• Looking at A 0535+26 at low luminosities withNuSTAR