Massive star formation at the Galactic crossroads: Insights from G358.69+0.03 in the Galactic center

We investigated the high-mass star formation activity in a subregion of the Sagittarius,E star-forming complex, centered at ( , ) = (358.69°, 0.03°), where infrared and radio sources trace a prominent U-shaped structure that has not been identified in previous studies. We used radio continuum data from the Global View on Star Formation (GLOSTAR) survey, which is a wide-band radio (4--8 GHz) survey of the Milky Way that combines data from the Very Large Array and the Effelsberg 100 m telescope. Using source extraction software, we identified 49 compact radio sources. Based on multiwavelength associations and spectral index estimates, we identified GLOSTAR counterparts to 27 previously confirmed regions, detected radio emission from 3 WISE ``radio-quiet'' candidates, and report 5 new region candidates. The derived physical properties indicate that most are relatively evolved regions. We find around 50 cold dust clumps, predominantly toward the south and southeast. Mid-infrared flux-ratio maps ( l b Karl G. Jansky BLOBCAT H ii H ii H ii 4.5 / 3.6 -1 ) velocity bridge that links the far dust-lane inflow to the central molecular zone (CMZ) stream. The largest concentration of clumps and compact regions lies at this interface. These combined diagnostics favor a scenario in which bar-driven cloud–cloud collision at the far dust-lane--CMZ interface compressed the gas and triggered the observed high-mass star formation. H ii