The Fermi/eROSITA Bubbles: A look into the nuclear outflow from the Milky Way

• DOI: 10.48550/arxiv.2403.09824
• Publication Date: 2024-03-14
• Authors: Kartick C. Sarkar
• Keywords: Outflow

Galactic outflows are ubiquitous in galaxies containing active star formation or supermassive black hole activity. The presence of a large-scale outflow from the center our own Galaxy was confirmed after discovery two large ($\sim 8-10$ kpc) \gamma-ray bubbles using \textit{Fermi-LAT} telescope. These bubbles, known as Fermi Bubbles, highly symmetric about disk well around rotation axis and appear to emanate Galaxy. sharp edges these suggest that they related outflow. surrounded by even bigger 12-14$ X-ray structures, eROSITA bubbles. Together, represent characteristics an into circumgalactic medium. Multi-wavelength observations such radio, microwave, UV toward Bubbles have provided us with much information last decade. However, origin nature remain elusive. In this review, I summarize Fermi/eROSITA at different scales wavelengths, give brief overview current understanding them.