Radioastron probing the fine structure of the flaring H2O maser in star-forming region G25.65+1.05

TL;DR

This study uses Space-VLBI with Radioastron and VLBA to investigate the fine structure of 22 GHz H2O masers in a star-forming region during flare events, revealing detailed spatial information.

Contribution

First detailed Space-VLBI observations of H2O masers in G25.65+1.05 during different flare states, providing unprecedented resolution of maser structures.

Findings

High-resolution imaging of maser structures during flares

Insights into the spatial dynamics of maser regions

Enhanced understanding of star formation processes

Abstract

The paper describes a Space-VLBI observation of the 22 GHz H2O masers in the massive star-forming region G25.65+1.05, using the 10-m space antenna of Radioastron together with the ground-based VLBA array. Two observing epochs at the pre-flare and post-flare state of the maser source are presented. Leveraging the exceptional angular resolution provided by space-ground baselines along with the broad UV coverage from VLBA baselines, we gained a detailed perspective on the area associated with the maser flare events.