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/

Global: Zendy Plus annual

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

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the results from an archival XMM-Newton observation of theSupergiant Fast X-ray Transient (SFXT) IGR J18483-0311 during its apastronpassage. The measured 0.5--10 keV luminosity state (1.3$\times10^{33}$ ergs$^{-1}$) is the lowest ever reported in the literature, it is best fitted byan absorbed black body model yielding parameters consistent with previousmeasurements. In addition, we find evidence of an emission line feature at$\sim$3.3 keV in the 0.5--10 keV EPIC-pn source spectrum. We show that itsphysical explanation in terms of atomic emission line appears unlikely andconversely we attempt to ascribe it to an electron cyclotron emission linewhich would implies a neutron star magnetic field of the order of$\sim3\times10^{11}$ G. A possible hint of the first harmonic is also found. Iffirmly confirmed by future longer X-ray observations, this would be the firstdetection ever of a cyclotron feature in the X-ray spectrum of a SFXT, withimportant implications on theoretical models.

XMM-Newton discovery of a possible cyclotron emission feature from the SFXT IGR J18483-0311