The X-Ray/Radio/Flaring Properties of Cygnus X-3

TL;DR

This paper reviews the flaring behavior and radio/X-ray states of Cygnus X-3, a unique microquasar with strong orbital modulation, persistent radio brightness, and gamma-ray activity, providing a revised state classification based on its hardness-intensity diagram.

Contribution

It introduces a revised classification of Cygnus X-3's radio/X-ray states using the hardness-intensity diagram and explores their connection to gamma-ray detections.

Findings

Revised radio/X-ray state classification for Cygnus X-3.

Correlation between activity states and gamma-ray detections.

Insights into the flaring behavior of Cygnus X-3.

Abstract

Cygnus X-3 is a unique microquasar. Its X-ray emission shows a very strong 4.8-hour orbital modulation. But its mass-donating companion is a Wolf-Rayet star. Also unlike most other X-ray binaries Cygnus X-3 is relatively bright in the radio virtually all of the time (the exceptions being the quenched states). Cygnus X-3 also undergoes giant radio outbursts (up to 20 Jy). In this presentation we discuss and review the flaring behavior of Cygnus X-3 and its various radio/X-ray states. We present a revised set of radio/X-ray states based on Cygnus X-3's hardness-intensity diagram (HID). We also examine the connection of a certain type of activity to the reported AGILE/Fermi gamma-ray detections of Cygnus X-3.