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dc.contributor.authorBorthakur, Sanchayeeta
dc.contributor.authorHeckman, Timothy
dc.contributor.authorStrickland, David
dc.contributor.authorWild, Vivienne
dc.contributor.authorSchiminovich, David
dc.date.accessioned2014-08-13T15:31:01Z
dc.date.available2014-08-13T15:31:01Z
dc.date.issued2013-05-01
dc.identifier68121113
dc.identifier926b085a-4ae7-45ba-9162-0e0847e0de76
dc.identifier000317960500018
dc.identifier84876751285
dc.identifier.citationBorthakur , S , Heckman , T , Strickland , D , Wild , V & Schiminovich , D 2013 , ' The impact of starbursts on the circumgalactic medium ' , Astrophysical Journal , vol. 768 , no. 1 , 18 . https://doi.org/10.1088/0004-637X/768/1/18en
dc.identifier.issn0004-637X
dc.identifier.urihttps://hdl.handle.net/10023/5142
dc.description.abstractWe present a study exploring the impact of a starburst on the properties of the surrounding circumgalactic medium (CGM): gas located beyond the galaxy's stellar body and extending out to the virial radius (∼ 200 kpc). We obtained ultraviolet spectroscopic data from the Cosmic Origins Spectrograph (COS) probing the CGM of 20 low-redshift foreground galaxies using background QSOs. Our sample consists of starburst and control galaxies. The latter comprises normal star-forming and passive galaxies with similar stellar masses and impact parameters as the starbursts. We used optical spectra from the Sloan Digital Sky Survey to estimate the properties of the starbursts, inferring average ages of ∼ 200 Myr and burst fractions involving ∼ 10% of their stellar mass. The COS data reveal highly ionized gas traced by C IV in 80%(4/5) of the starburst and in 17%(2/12) of the control sample. The two control galaxies with C IV absorbers differed from the four starbursts in showing multiple low-ionization transitions and strong saturated Ly alpha lines. They therefore appear to be physically different systems. We show that the C IV absorbers in the starburst CGM represent a significant baryon repository. The high detection rate of this highly ionized material in the starbursts suggests that starburst-driven winds can affect the CGM out to radii as large as 200 kpc. This is plausible given the inferred properties of the starbursts and the known properties of starburst-driven winds. This would represent the first direct observational evidence of local starbursts impacting the bulk of their gaseous halos, and as such provides new evidence of the importance of this kind of feedback in the evolution of galaxies.
dc.format.extent20
dc.format.extent2141942
dc.language.isoeng
dc.relation.ispartofAstrophysical Journalen
dc.subjectGalaxies: abundancesen
dc.subjectGalaxies: ISMen
dc.subjectGalaxies: starbursten
dc.subjectQuasars: absorption linesen
dc.subjectStar-forming galaxiesen
dc.subjectLY-alpha absorptionen
dc.subjectDigital sky surveyen
dc.subjectLow-redshift universeen
dc.subjectLocal universeen
dc.subjectInterstellar shocksen
dc.subjectPhysical-propertiesen
dc.subjectAbsorbing galaxiesen
dc.subjectRadiative transferen
dc.subjectQB Astronomyen
dc.subject.lccQBen
dc.titleThe impact of starbursts on the circumgalactic mediumen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doi10.1088/0004-637X/768/1/18
dc.description.statusPeer revieweden
dc.identifier.grantnumberST/J001651/1en


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