ترجمه فارسی مقاله : Abell 0399−Abell 0401 radio bridge spectral index:the first multifrequency detection

7 صفحه متن انگلیسی به صورت PDF و  14 صفحه متن ترجمه شده به فارسی به صورت WORD Abell 0399–Abell0401 شاخص طیفی برامدگی یا جسر رادیویی :اولین تشخیص چند فرکانسی نمونه متن انگلیسی: Aims Recent low-frequency radio observations at 140 MHz discovered a 3 Mpc-long bridge of diffuse emission connecting the galaxy clusters Abell 0399 and Abell 0401.We present follow-up observations at 60 MHz to constrain the spectral index of the bridge, which so far has only been detected at 140 and 144 MHz. Methods. We analysed deep ( ∼ 18 hours) LOw Frequency Array (LOFAR) Low Band Antenna (LBA) data at 60 MHz to detect the bridge at very low frequencies. We then conducted a multi-frequency study with LOFAR HBA data at 144 MHz and uGMRT data at 400 MHz. Assuming second-order Fermi mechanisms for the re-acceleration of relativistic electrons driven by turbulence in the radio bridge regions, we compare the observed radio spectrum with theoretical synchrotron models. نمونه متن ترجمه شده: اهداف …