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dc.contributor.authorJames, BLen
dc.contributor.authorAuger, Men
dc.contributor.authorPettini, Men
dc.contributor.authorStark, DPen
dc.contributor.authorBelokurov, Vasilyen
dc.contributor.authorCarniani, Stefanoen
dc.date.accessioned2018-04-20T13:52:38Z
dc.date.available2018-04-20T13:52:38Z
dc.date.issued2018-05-11en
dc.identifier.issn0035-8711
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/275076
dc.description.abstractWe present the first spatially-resolved rest-frame UV study of the gravitationally lensed galaxy, the 'Cosmic Horseshoe' (J1148+1930) at z=2.38. Our gravitational lens model shows that the system is made up of four star-forming regions, each ~4-8 kpc^2 in size, from which we extract four spatially exclusive regional spectra. We study the interstellar and wind absorption lines, along with CIII] doublet emission lines, in each region to investigate any variation in emission/absorption line properties. The mapped CIII] emission shows distinct kinematical structure, with velocity offsets of ~+/-50 km/s between regions suggestive of a merging system, and a variation in equivalent width that indicates a change in ionisation parameter and/or metallicity between the regions. Absorption line velocities reveal a range of outflow strengths, with gas outflowing between -200<v(km/s)<-50 relative to the systemic velocity of that region. Interestingly, the strongest gas outflow appears to emanate from the most diffuse star-forming region. The star-formation rates remain relatively constant (~8-16 M_sol/yr), mostly due to large uncertainties in reddening estimates. As such, the outflows appear to be 'global' rather than 'locally' sourced. We measure electron densities with a range of log(Ne)=3.92-4.36 cm^-3, and point out that such high densities may be common when measured using the CIII] doublet due to its large critical density. Overall, our observations demonstrate that while it is possible to trace variations in large scale gas kinematics, detecting inhomogeneities in physical gas properties and their effects on the outflowing gas may be more difficult. This study provides important lessons for the spatially-resolved rest-frame UV studies expected with future observatories, such as JWST.
dc.description.sponsorshipBLJ thanks support from the European Space Agency (ESA) and SC acknowledges nancial support from the Science & Technology Facilities Council (STFC). The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement no. 308024.
dc.publisherOxford University Press
dc.titleMapping UV properties throughout the cosmic horseshoe: Lessons from VLT-MUSEen
dc.typeArticle
prism.endingPage1740
prism.issueIdentifier2en
prism.publicationDate2018en
prism.publicationNameMonthly Notices of the Royal Astronomical Societyen
prism.startingPage1726
prism.volume476en
dc.identifier.doi10.17863/CAM.22255
rioxxterms.versionofrecord10.1093/mnras/sty315en
rioxxterms.versionVoR*
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-05-11en
dc.contributor.orcidBelokurov, Vasily [0000-0002-0038-9584]
dc.contributor.orcidCarniani, Stefano [0000-0002-6719-380X]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/M001172/1)
pubs.funder-project-idEuropean Research Council (308024)
pubs.funder-project-idSTFC (ST/K004182/1)
cam.orpheus.successThu Jan 30 13:04:41 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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