Spatially Resolved Circumgalactic Medium around a Star-forming Galaxy Driving a Galactic Outflow at z ≈ 0.8

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dc.catalogadorpau
dc.contributor.authorShaban, Ahmed
dc.contributor.authorBordoloi, Rongmon
dc.contributor.authorO’Meara, John M.
dc.contributor.authorSharon, Keren
dc.contributor.authorTejos, Nicolás
dc.contributor.authorLópez, Sebastián
dc.contributor.authorLedoux, Cédric
dc.contributor.authorBarrientos, Luis Felipe
dc.contributor.authorRigby, Jane R.
dc.date.accessioned2025-07-03T19:53:10Z
dc.date.available2025-07-03T19:53:10Z
dc.date.issued2025
dc.description.abstractWe report the small-scale spatial variation in cool (T ∼ 104 K) Mg II absorption detected in the circumgalactic medium (CGM) of a star-forming galaxy at z ≈ 0.8. The CGM of this galaxy is probed by a spatially extended bright background gravitationally lensed arc at z = 2.76. The background arc continuously samples the CGM of the foreground galaxy at a range of impact parameters between 54 and 66 kpc. The Mg II absorption strengths vary by more than a factor of 2 within these ranges. A power-law fit to the fractional variation of absorption strengths yields a coherence length of 5.8 kpc within this range of impact parameters. This suggests a high degree of spatial coherence in the CGM of this galaxy. The host galaxy is driving a strong galactic outflow with a mean outflow velocity ≈ 179 km s−1 and mass outflow rate + M 64out 27 31 M⊙ yr−1 traced by blueshifted Mg II and Fe II absorption lines. The galaxy itself has a spatially extended emission halo with a maximum spatial extent of ≈33 kpc traced by [O II], [O III], and Hβ emission lines. The extended emission halo shows kinematic signatures of corotating halo gas with solar metallicity. Taken together, these observations suggest evidence of a baryon cycle that is recycling the outflowing gas to form the next generation of stars
dc.fechaingreso.objetodigital2025-07-03
dc.format.extent17 páginas
dc.fuente.origenORCID
dc.identifier.doi10.3847/1538-4357/add0b9
dc.identifier.urihttps://doi.org/10.3847/1538-4357/add0b9
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/104845
dc.information.autorucInstituto de Astrofísica; Barrientos, Luis Felipe; 0000-0003-0151-0718; 102167
dc.issue.numero2
dc.nota.accesocontenido completo
dc.revistaThe Astrophysical Journal
dc.rightsacceso abierto
dc.rights.licenseCC BY 4.0 Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGalactic winds
dc.subjectCircumgalactic medium
dc.subjectGalaxy evolution
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleSpatially Resolved Circumgalactic Medium around a Star-forming Galaxy Driving a Galactic Outflow at z ≈ 0.8
dc.typeartículo
dc.volumen986
sipa.codpersvinculados102167
sipa.trazabilidadORCID;2025-06-23
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