Iron Line from Neutron Star Accretion Disks in Scalar Tensor Theories release_n4cxrk2hjvagvfa5luifll4wje

by N. Bucciantini

Released as a article .

(2020)

Abstract

The Fe K_\alpha fluorescent line at 6.4 keV is a powerful probe of the space-time metric in the vicinity of accreting compact objects. We investigated here how some alternative theories of gravity, namely Scalar tensor Theories, that invoke the presence of a non-minimally coupled scalar field and predict the existence of strongly scalarized neutron stars, change the expected line shape with respect to General Relativity. By taking into account both deviations from the general relativistic orbital dynamics of the accreting disk, where the Fe line originates, and the changes in the light propagation around the neutron star, we computed line shapes for various inclinations of the disk with respect to the observer. We found that both the intensity of the low energy tails and the position of the high energy edge of the line change. Moreover we verified that even if those changes are in general of the order of a few percent, they are potentially observable with the next generation of X-ray satellites.
In text/plain format

Archived Files and Locations

application/pdf  353.0 kB
file_arzgv4evbrc53p4wkbkdayd6gy
web.archive.org (webarchive)
arxiv.org (repository)
Read Archived PDF
Archived
Type  article
Stage   submitted
Date   2020-04-01
Version   v1
Language   en ?
arXiv  2004.00322v1
Work Entity
access all versions, variants, and formats of this works (eg, pre-prints)
Catalog Record
Revision: 66a18d66-befc-4d5f-91c3-2309a97bf437
API URL: JSON