Suzaku Observation Adjacent to the South End of the Radio Arc

TL;DR

This study used Suzaku to observe the Galactic center near the Radio Arc, identifying multiple X-ray sources including diffuse emissions and peculiar clumps, and discusses their origins.

Contribution

First detailed Suzaku observation of the region near the Radio Arc revealing multiple X-ray sources and analyzing their potential origins.

Findings

Detected four distinct X-ray sources in the region.

Identified a peculiar 6.4 keV line clump at the Radio Arc's south end.

Discussed possible origins of the small X-ray clumps.

Abstract

Suzaku observed the Galactic center region near the Radio Arc at ~20' southeast of Sagittarius A*.In the 18'x18' field of view, we found four distinct X-ray sources: a bright star and a diffuse source associated with the star clusters in the soft band (0.5-2.0 keV), a small clump in a higher energy band (4-6 keV), and a peculiar clump in the 6.4 keV line band.The latter two clumps are located at the south end of the Radio Arc. This paper reports on the results, and discusses the origin of these X-ray sources, with a particular emphasis on small clumps.