A Hidden Radio Halo in the Galaxy Cluster A1682?

Journal of astrophysics and astronomy

D. Dallacasa1¹  T. Venturi1¹  S. Giacintucci² 

[1] INAF, Istituto di Radioastronomia, Via Gobetti 101, 40129 Bologna, Italy.$$;Department of Astronomy, University of Maryland, College Park, MD 20742–2421, USA.$$

关键词: Galaxies: clusters: general;    galaxies: clusters: individual: A1682;    radio continuum: general.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

High sensitivity observations of radio halos in galaxy clusters at frequencies 𝑣 ≤ 330 MHz are still relatively rare, and very little is known compared to the classical 1.4 GHz images. The few radio halos imaged down to 150–240 MHz show a considerable spread in size, morphology and spectral properties. All clusters belonging to the GMRT Radio Halo Survey with detected or candidate cluster-scale diffuse emission have been imaged at 325 MHz with the GMRT. Few of them were also observed with the GMRT at 240 MHz and 150 MHz. For A1682, imaging is particularly challenging due to the presence of strong and extended radio galaxies at the center. Our data analysis suggests that thew radio galaxies are superposed to very low surface brightness radio emission extended on the cluster scale, which we present here.

【 授权许可】

Unknown