Search for synchrotron emission from secondary leptons in dense cold starless cores

Understand

We report radio continuum observations with the Australia Telescope Compact Array of two molecular clouds.

• The impetus for these observations is a search for synchrotron radiation by cosmic ray secondary electrons/positrons in a region of enhanced density and possibly high magnetic field.
• We present modelling which shows that there should be an appreciable flux of synchrotron above the more diffuse, galactic synchrotron background.
• The starless core G333.125-0.562 and infrared source IRAS 15596-5301 were observed at 1384 and 2368 MHz.