Relationship between the Metallicity of the Circumgalactic Medium and Galaxy Orientation
Stephanie K. Pointon, Glenn G. Kacprzak, Nikole M. Nielsen, Sowgat, Muzahid, Michael T. Murphy, Christopher W. Churchill, Jane C. Charlton
TL;DR
This study examines the metallicity distribution in the circumgalactic medium of 47 low-redshift galaxies, finding it to be largely independent of galaxy orientation and halo mass, with implications for gas accretion and outflow processes.
Contribution
It provides the first detailed analysis of CGM metallicity distribution relative to galaxy orientation, revealing independence from azimuthal and inclination angles at low redshift.
Findings
Metallicity distribution appears bimodal but may be unimodal.
CGM metallicity is independent of halo mass.
No dependence of metallicity on galaxy azimuthal or inclination angles.
Abstract
We investigate the geometric distribution of gas metallicities in the circumgalactic medium (CGM) around , galaxies from the "Multiphase Galaxy Halos" Survey. Using a combination of quasar spectra from HST/COS and from Keck/HIRES or VLT/UVES we measure column densities of, or determine limits on, CGM absorption lines. We then use a Monte-Carlo Markov chain approach with Cloudy to estimate the metallicity of cool (TK) CGM gas. We also use HST images to determine host galaxy inclination and quasar--galaxy azimuthal angles. Our sample spans a HI column density range of cm s cm s. We find (1) while the metallicity distribution appears bimodal, a Hartigan dip test cannot rule out a unimodal distribution (). (2) CGM metallicities are independent of halo mass, spanning three orders of magnitude at fixed halo mass. (3)…
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