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The relationship between galaxies and the state/chemical enrichment of thewarm-hot intergalactic medium (WHIM) expected to dominate the baryon budget atlow-z provides sensitive constraints on structure formation and galaxyevolution models. We present a deep redshift survey in the field of1ES1553+113, a blazar with a unique combination of UV+X-ray spectra for surveysof the circum-/intergalactic medium (CGM/IGM). Nicastro et al. 2018 reportedthe detection of two O VII WHIM absorbers at $z=0.4339$ and $0.3551$ in itsspectrum, suggesting that the WHIM is metal-rich and sufficient to close themissing baryons problem. Our survey indicates that the blazar is a member of a$z=0.433$ group and that the higher-$z$ O VII candidate arises from itsintragroup medium. The resulting bias precludes its use in baryon censuses. The$z=0.3551$ candidate occurs in an isolated environment 630 kpc from the nearestgalaxy (with stellar mass $\log M_*/M_\odot \approx 9.7$) which we show isunexpected for the WHIM. Finally, we characterize the galactic environments ofbroad H I Ly$\alpha$ absorbers (Doppler widths of $b=40-80$ \kms;$T\lesssim4\times10^5$ K) which provide metallicity independent WHIM probes. Onaverage, broad Ly$\alpha$, absorbers are ${\approx}2\times$ closer to thenearest luminous ($L>0.25 L_*$) galaxy (700 kpc) than narrow ($b<30$ \kms;$T\lesssim4\times10^5$ K) ones (1300 kpc) but ${\approx}2\times$ further thanO\,VI absorbers (350 kpc). These observations suggest that gravitationalcollapse heats portions of the IGM to form the WHIM but with feedback that doesnot enrich the IGM far beyond galaxy/group halos to levels currently observablein UV/X-ray metal lines.

the astrophysical journal. letters

The Physical Origins of the Identified and Still Missing Components of  the Warm-Hot Intergalactic Medium: Insights from Deep Surveys in the Field of  Blazar 1ES1553+113