Physics of 1 keV line in X-ray binaries

X-ray binaries (XRBs) often exhibit spectral residuals in the 0.5 to 2 keV range, known as the "1 keV residual/1 keV feature", with variable centroid and intensity across different systems. Yet a comprehensive scientific explanation of the variability of the 1 keV feature has remained larg...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2024-07
Main Authors: Chakraborty, Priyanka, Ferland, Gary, Fabian, Andrew, Sarkar, Arnab, Ludlam, Renee, Bianchi, Stefano, Hall, Hayden, Kosec, Peter
Format: Article
Language:English
Subjects:
Centroids
Mixtures
Pulsars
Variability
X ray binaries
X ray sources
X ray stars
X-ray astronomy
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:X-ray binaries (XRBs) often exhibit spectral residuals in the 0.5 to 2 keV range, known as the "1 keV residual/1 keV feature", with variable centroid and intensity across different systems. Yet a comprehensive scientific explanation of the variability of the 1 keV feature has remained largely elusive. In this paper, we explain for the first time the origin and variability of the 1 keV feature in XRBs using the spectral synthesis code \textsc{Cloudy}. We constructed line blends for the emission and absorption lines and study the variability of these blends with ionization parameters, temperature, and column density. We conducted a sample study involving five XRBs including two ultraluminous X-ray sources (ULXs): NGC 247 ULX-1, NGC 1313 X-1, a binary X-ray pulsar: Hercules X-1, and two typical low-mass X-ray binaries (LMXBs): Cygnus X-2, and Serpens X-1, providing a comprehensive explanation of the 1 keV feature observed across these targets.
ISSN:2331-8422