Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/8414| Title: | Detection of CRSF in Cep X-4 at a low luminosity level |
| Authors: | Roy, Kinjal Sharma, Rahul |
| Keywords: | accretion x-rays individual Cepheus X-4 |
| Issue Date: | 1-Dec-2025 |
| Publisher: | Elsevier |
| Citation: | New Astronomy, 2025, Vol. 121, p102435 |
| Abstract: | The BeXRP Cep X-4 underwent a type II outburst during July 2023, during which NuSTAR made two observations of the source. In this paper, we present the spectral and timing analysis of Cep X-4 during this outburst. Pulsations were detected from the source at the neutron star spin period of ∼ 66 s from both observations. We detected a CRSF feature at an energy of 27.3+1.5 −1.0 keV in the spectrum of Cep X-4 during the first observation. In the second observation conducted a day later when the source luminosity dropped by a factor of five, no CRSF could be detected significantly. A positive correlation between CRSF energy and luminosity was observed using data from multiple outbursts since 1998. The collisionless shock model provides a good fit to the observed variations of cyclotron line energy with luminosity, giving a surface magnetic field strength of ∼ 2.6× 1012 G. |
| Description: | Open Access |
| URI: | http://hdl.handle.net/2289/8414 |
| Alternative Location: | https://doi.org/10.1016/j.newast.2025.102435 |
| Copyright: | 2025 Elsevier B.V. |
| Appears in Collections: | Research Papers (A&A) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2025_New Astronomy_Vol.121_p102435.pdf | Open Access | 1.15 MB | Adobe PDF | View/Open |
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.