Double Relics in the Outskirts of A3376: Accretion Flows Meet Merger Shocks?

Journal of astrophysics and astronomy

Surajit Paul¹  K. S. Dwarakanath1²  Joydeep Bagchi¹  Ruta Kale1² 

[1] Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Pune 411 007, India$$;Raman Research Institute, Bangalore 560 080, India$$

关键词: Galaxy clusters;    relics.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The case of spectacular ring-like double radio relics in the merging, rich galaxy cluster A3376 is of great interest to study non-thermal phenomena at cluster outskirts.We present the first low frequency (330 and 150 MHz) images of the double relics using the GMRT. With our GMRT 330 MHz map and the VLA 1400 MHz map (Bagchi et al. 2006), we have constructed and analyzed the distribution of spectral indices over the radio relics. We find flat spectral indices at the outer edges of both the relics and a gradual steepening of spectral indices toward the inner regions. This supports the model of outgoing merger shock waves. The eastern relic has a complex morphology and spectral index distribution toward the inner region. This will be discussed in the context of the effect of large-scale accretion flows on the outgoing merger shocks as reported in the recent simulations.

【 授权许可】

Unknown