Detection of CRSF in Cep X-4 at a low luminosity level

Roy, Kinjal; Sharma, Rahul

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8414

Full metadata record

DC Field	Value	Language
dc.contributor.author	Roy, Kinjal	-
dc.contributor.author	Sharma, Rahul	-
dc.date.accessioned	2025-07-29T06:08:24Z	-
dc.date.available	2025-07-29T06:08:24Z	-
dc.date.issued	2025-12-01	-
dc.identifier.citation	New Astronomy, 2025, Vol. 121, p102435	en_US
dc.identifier.uri	http://hdl.handle.net/2289/8414	-
dc.description	Open Access	en_US
dc.description.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.	en_US
dc.language.iso	en	en_US
dc.publisher	Elsevier	en_US
dc.relation.uri	https://doi.org/10.1016/j.newast.2025.102435	en_US
dc.rights	2025 Elsevier B.V.	en_US
dc.subject	accretion	en_US
dc.subject	x-rays	en_US
dc.subject	individual	en_US
dc.subject	Cepheus X-4	en_US
dc.title	Detection of CRSF in Cep X-4 at a low luminosity level	en_US
dc.type	Article	en_US
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

Show simple item record