G0.57-0.018: A young supernova remnant? INTEGRAL and VLA observations

Abstract

We report INTEGRAL/IBIS gamma-ray and VLA radio observations of G0.570-0.018, a diffuse X-ray source recently discovered by ASCA and Chandra in the Galactic center region. Based on its spectrum and morphology, G0.570-0.018 has been proposed to be a very young supernova remnant. In this scenario, the presence of gamma-ray lines coming from the short-lived radioactive nucleus 44Ti as well as synchrotron radio continuum emission are expected. The first could provide informations on nucleosynthesis environments in the interior of exploding stars, the latter could probe the interaction between the supernova blast wave and the circumstellar/interstellar matter. We have not detected 44Ti lines nor any conspicuous radio feature associated with this source down to the achieved sensitivities. From the derived upper limits we set constraints on the nature of G0.570-0.018.

17 pages, 4 figures, accepted for publication in ApJ

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• A Geometric Determination of the Distance to the Galactic Center
• Evolution, Explosion and Nucleosynthesis of Core Collapse Supernovae
• The INTEGRAL/IBIS Scientific Data Analysis
• A Persistent High-Energy Flux from the Heart of the Milky Way : Integral's view of the Galactic Center
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• Annihilation emission from young supernova remnants
• The First VLBI Image of the Young, Oxygen-Rich Supernova Remnant in NGC 4449