A Deep uGMRT View of the Ultra-steep Spectrum Radio Halo in A521

• DOI: 10.3847/1538-4357/ad1190
• Publication Date: 2024-02-05T14:43:38Z
• Authors: R. Santra; R. Kale; S. Giacintucci; M. Markevitch; F. De Luca; H. Bourdin; T. Venturi; D. Dallacasa; R. Cassano; G. Brunetti; K. D. Buch
• Keywords: Red shift

Abstract We present the first detailed analysis of ultra-steep spectrum radio halo in merging galaxy cluster A521, based on upgraded Giant Metrewave Radio telescope observations. The combination observations (300–850 MHz) and archival X-ray data provides a new window into complex physics occurring this system. When compared to all previous analyses, our sensitive images detected centrally located emission greater extent ∼1.3 Mpc. A faint extension southeastern relic has been discovered. another relic, recently discovered by MeerKAT, coincident with possible shock front X-rays, at northwest position center. find that integrated is well-fitted spectral index −1.86 ± 0.12. spatially resolved map revealed fluctuations, as well an outward radial steepening average index. surface brightness correlated for entire different subparts halo, sublinear correlation slopes (0.50–0.65). also found mild anticorrelation between brightness. Newly extensions SE counter are consistent merger plane sky.