dc.contributor.author Suresh, J dc.contributor.author Bird, S dc.contributor.author Vogelsberger, M dc.contributor.author Genel, S dc.contributor.author Torrey, P dc.contributor.author Sijacki, D dc.contributor.author Springel, V dc.contributor.author Hernquist, L dc.date.accessioned 2019-05-29T14:03:22Z dc.date.available 2019-05-29T14:03:22Z dc.date.issued 2015 dc.identifier.issn 0035-8711 dc.identifier.uri https://www.repository.cam.ac.uk/handle/1810/293212 dc.description.abstract Galactic feedback strongly affects the way galactic environments are enriched. We examine this connection by performing a suite of cosmological hydrodynamic simulations, exploring a range of parameters based on the galaxy formation model developed in Vogelsberger et al. 2013 (henceforth V13). We examine the effects of AGN feedback, wind mass loading, wind specific energy, and wind metal-loading on the properties of the circumgalactic medium (CGM) of galaxies with $M_\text{halo} > 10^{11} M_\odot$. Note that while the V13 model was tuned to match observations including the stellar mass function, no explicit tuning was done for the CGM. The wind energy per unit outflow mass has the most significant effect on the CGM enrichment. High energy winds launch metals far beyond the virial radius. AGN feedback also has a significant effect, but only at $z < 3$. We compare to high redshift HI and CIV observations. All our simulations produce the observed number of Damped Lyman-$\alpha$ Absorbers. At lower column density, several of our simulations produce enough Lyman Limit Systems (LLS) $100$ kpc from the galaxy, but in all cases the LLS abundance falls off with distance faster than observations, with too few LLS at $200$ kpc. Further, in all models the CIV abundance drops off too sharply with distance, with too little CIV $100$-$200$ kpc from the galaxy. Higher energy wind models produce more extended CIV but also produce less stars, in tension with star-formation rate density observations. This highlights the fact that circumgalactic observations are a strong constraint on galactic feedback models. dc.publisher Oxford University Press (OUP) dc.title The impact of galactic feedback on the circumgalactic medium dc.type Article prism.endingPage 909 prism.issueIdentifier 1 prism.publicationDate 2015 prism.publicationName Monthly Notices of the Royal Astronomical Society prism.startingPage 895 prism.volume 448 dc.identifier.doi 10.17863/CAM.40360 rioxxterms.versionofrecord 10.1093/mnras/stu2762 rioxxterms.version VoR rioxxterms.licenseref.uri http://www.rioxx.net/licenses/all-rights-reserved rioxxterms.licenseref.startdate 2015-03-21 dc.contributor.orcid Sijacki, Debora [0000-0002-3459-0438] dc.identifier.eissn 1365-2966 rioxxterms.type Journal Article/Review pubs.funder-project-id Science and Technology Facilities Council (ST/L000725/1) cam.issuedOnline 2015-02-09
﻿