We report on the detection of two O vi absorbers at z = 0.41614 and 0.41950 ( separated in velocity by | \Delta v| = 710 km s ^ { -1 } ) towards SBS 0957 + 599 .
Both absorbers are multiphase systems tracing substantial reservoirs of warm baryons .
The low and intermediate ionization metals in the z = 0.41614 absorber are consistent with an origin in photoionized gas .
The O vi has a velocity structure different from other metal species .
The Ly \alpha shows the presence of a broad feature .
The line widths for O vi and the broad-Ly \alpha suggest T = 7.1 \times 10 ^ { 5 } K. This warm medium is probing a baryonic column which is an order of magnitude more than the total hydrogen in the cooler photoionized gas .
The second absorber is detected only in H i and O vi .
Here the temperature of 4.6 \times 10 ^ { 4 } K supports O vi originating in a low-density photoionized gas .
A broad component is seen in the Ly \alpha , offset from the O vi .
The temperature in the broad-Ly \alpha is T \lesssim 2.1 \times 10 ^ { 5 } K. The absorbers reside in a galaxy overdensity region with 7 spectroscopically identified galaxies within \sim 10 Mpc and \Delta v \sim 1000 km s ^ { -1 } of the z = 0.41614 absorber , and 2 galaxies inside a similar separation from the z = 0.41950 absorber .
The distribution of galaxies relative to the absorbers suggest that the line of sight could be intercepting a large-scale filament connecting galaxy groups , or the extended halo of a sub- L ^ { * } galaxy .
Though kinematically proximate , the two absorbers reaffirm the diversity in the physical conditions of low redshift O vi systems and the galactic environments they inhabit .