English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We analyze the latest \emph{Suzaku} observation of the bright neutron starlow-mass X-ray binary Serpens X-1 taken in 2013 October and 2014 April. Theobservation was taken using the burst mode and only suffered mild pile-upeffects. A broad iron line is clearly detected in the X-ray spectrum. We testdifferent models and find that the iron line is asymmetric and best interpretedby relativistic reflection. The relativistically broadened iron line isgenerally believed to originate from the innermost regions of the accretiondisk, where strong gravity causes a series of special and general relativisticeffects. The iron line profile indicates an inner radius of $\sim8$ $R_{\rmG}$, which gives an upper limit on the size of the neutron star. The asymmetriciron line has been observed in a number of previous observations, which givesseveral inner radius measurements at different flux states. We find that theinner radius of Serpens X-1 does not evolve significantly over the range of$L/L_{\rm Edd}\sim0.4-0.6$, and the lack of flux dependence of the inner radiusimplies that the accretion disk may be truncated outside the innermost stablecircular orbit by the boundary layer rather than the stellar magnetic field.

On the evolution of the inner disk radius with flux in the neutron star low-mass X-ray binary Serpens X-1