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This paper presents a study of the chemical compositions in cool gas around asample of 27 intermediate-redshift galaxies. The sample comprises 13 massivequiescent galaxies at z=0.40-0.73 probed by QSO sightlines at projecteddistances d=3-400 kpc, and 14 star-forming galaxies at z=0.10-1.24 probed byQSO sightlines at d=8-163 kpc. The main goal of this study is to examine theradial profiles of the gas-phase Fe/{\alpha} ratio in galaxy halos based on theobserved Fe II to Mg II column density ratios. Because Mg+ and Fe+ sharesimilar ionization potentials, the relative ionization correction is small inmoderately ionized gas and the observed ionic abundance ratio N(Fe II)/N(Mg II)places a lower limit to the underlying (Fe/Mg) elemental abundance ratio. Forquiescent galaxies, a median and dispersion of log <N(Fe II)/N(Mg II)>=-0.06+/-0.15 is found at d<~60 kpc, which declines to log <N(Fe II)/N(Mg II)><-0.3 at d>~100 kpc. On the other hand, star-forming galaxies exhibit log <N(FeII)/N(Mg II)> =-0.25+/-0.21 at d<~60 kpc and log <N(Fe II)/N(Mg II)>=-0.9+/-0.4 at larger distances. Including possible differential dust depletionor ionization correction would only increase the inferred (Fe/Mg) ratio. Theobserved N(FeII)/N(Mg II) implies super-solar Fe/{\alpha} ratios in the innerhalo of quiescent galaxies. An enhanced Fe abundance indicates a substantialcontribution by Type Ia supernovae in the chemical enrichment, which is atleast comparable to what is observed in the solar neighborhood or inintracluster media but differs from young star-forming regions. In the outerhalos of quiescent galaxies and in halos around star-forming galaxies, however,the observed N(Fe II)/N(Mg II) is consistent with an {\alpha}-element enhancedenrichment pattern, suggesting a core-collapse supernovae dominated enrichmenthistory.

On the radial profile of gas-phase Fe/{\alpha} ratio around distant galaxies