Xray studies of neutron stars and the equation of state
Abstract
The understanding of neutron star equation of state hinges on a comprehensive analysis of multimessenger, multiwavelength data. The recent scrutiny of PSR J0030+0451 data by NICER introduces complexities, unveiling a tension with another Xray observation of the central compact object in HESS J1731347, specifically concerning the massradius constraint of lowmass neutron stars. This tension persists when integrating NICER's updated data with LIGO/Virgo's gravitationalwave data from the GW170817 binary neutron star merger. Despite attempts to reconcile these disparate observations, the current combined data still can not distinguish different types of neutron stars  whether they are pure neutron stars or hybrid stars. Bayesian inference indicates only modest changes in the posterior ranges of parameters related to the nuclear matter and deconfinement phase transition. This ongoing exploration underscores the intricate challenges in precisely characterizing neutron stars. It also points out that it is possible to probe the equation of state at different density regimes from future more accurate radii of neutron stars with various masses.
 Publication:

arXiv eprints
 Pub Date:
 February 2024
 DOI:
 10.48550/arXiv.2402.02799
 arXiv:
 arXiv:2402.02799
 Bibcode:
 2024arXiv240202799M
 Keywords:

 Astrophysics  High Energy Astrophysical Phenomena;
 Nuclear Theory
 EPrint:
 12 pages, 6 figures, 2 tables