Spectral formation in accreting X-ray pulsars: bimodal variation of the cyclotron energy with luminosity

Free Access

Table 1

Source sample characteristics.

Source	Instrument	Long-term	Pulse-pulse	ΔE	Distance
		correlation	correlation	(keV)	(kpc)


4U 0115+63	INTEGRAL/RXTE	cont. dependent¹	negative⁶	[3−60]	8.0⁷
V0332+53	INTEGRAL/RXTE	negative²	negative⁶	[3−100]	7.5⁸
Her X-1	RXTE	positive³	positive⁶	[5−60]	6.4⁹
A0535+26	INTEGRAL/RXTE	no⁴	positive⁶	[3−50]	2.0¹⁰
GX 304-1	RXTE/Suzaku	positive⁵	–	[3−100]	2.4¹¹

References.

⁽¹⁾

Müller et al. (2011);

⁽²⁾

Tsygankov et al. (2010);

⁽³⁾

Staubert et al. (2007);

⁽⁴⁾

Caballero et al. (2007);

⁽⁵⁾

Yamamoto et al. (2011);

⁽⁶⁾

Klochkov et al. (2011);

⁽⁷⁾

Negueruela & Okazaki (2001);

⁽⁸⁾

Negueruela et al. (1999);

⁽⁹⁾

Reynolds et al. (1997);

⁽¹⁰⁾

Steele et al. (1998);

⁽¹¹⁾

Parkes et al. (1980).

Notes. Our analysis is based on a combination of published data (references given) and reprocessed observational data for a number of cyclotron line sources (Col. 1) as observed by different X-ray observatories (Col. 2), listed here. The cyclotron line sources have been observed to show different types of correlation, or no correlation, of their cyclotron line energies with changes in the X-ray luminosity.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.