The SRG/eROSITA All-Sky Survey

Context. The Hydra I galaxy cluster (Abell 1060) is a nearby example of a low-temperature cluster that exhibits intermediate cool core (CC) and non-cool core (NCC) properties. In addition, little is known about the gas properties and large-scale structure beyond its R 500 . Aims. Our aims are to extend the characterization of the intracluster medium (ICM) properties at least until R 200 , and to study the correlation between the X-ray emission and nonthermal emission within R = 0.15 R 500 , and the optical/IR galaxy distribution beyond R 200 . Methods. We used data from the first four SRG/eROSITA All-Sky Surveys (eRASS:4) and an archival Chandra observation to image the X-ray emission from Abell 1060. We also used multiwavelength data from TGSS (radio), 2MASS (IR), and NED (optical) to investigate the nonthermal emission, 2D galaxy distribution, and its redshift evolution, respectively. The surface brightness and spectral analyses are also extended until 3 R 200 and R 200 , respectively, following a detailed cosmic X-ray background (CXB) analysis. Results. Our fully corrected eROSITA image reveals a relaxed ICM morphology within R 500 . We detected two surface brightness discontinuities near the central galaxy NGC 3311 that spatially coincide with diffuse radio emission along the line of sight. We also modeled the central surface brightness cusp and the full profile until 3 R 200 using a modified β -model. Furthermore, we detected two soft X-ray excesses with high spatial correlation with the 2D optical galaxy distribution beyond R 200 . In particular, the excess in the north has a significance of 3.9 σ above the local CXB level. This suggests that the outskirts of Abell 1060 are actively accreting baryons. The NED spectroscopic redshift distribution of member galaxies is unimodal with a best-fit mean and standard deviation of 0.0121 ± 0.0027 from a Gaussian fit. We also estimate the average ICM temperature and metallicity of ⟨ k B T ⟩ = 2.51 +0.21 −0.21 keV and ⟨ Z ⟩ = 0.19 +0.10 −0.10 Z ⊙ , respectively, from the 0.2–0.5 R 500 annulus. Overall, the temperature profile is broadly consistent with the average temperature profiles from hydrodynamical simulation and Suzaku between 0.43 R 500 and R 500 .