## Kiloparsec Scale Properties of Star Formation Driven Outflows at z~ 2.3 in the SINS/zC-SINF AO Survey

### Description

We investigate the relationship between star formation activity and outflow properties on kiloparsec scales in a sample of 28 star-forming galaxies at z ~ 2–2.6, using adaptive optics assisted integral field observations from SINFONI on the Very Large Telescope. The narrow and broad components of the Hα emission are used to simultaneously determine the local star formation rate surface density (${{\rm{\Sigma }}}_{\mathrm{SFR}}$), and the outflow velocity ${v}_{\mathrm{out}}$ and mass outflow...[Show more]

dc.contributor.author Davies, Roger L Förster Schreiber, Natascha M F Übler, H. Genzel, R Lutz, Dieter Renzini, Alvio Tacchella, S. Tacconi, L J Belli, Sirio Burkert, Andreas Wisnioski, Emily 2022-05-02T04:13:39Z 2022-05-02T04:13:39Z 0004-637X http://hdl.handle.net/1885/264218 We investigate the relationship between star formation activity and outflow properties on kiloparsec scales in a sample of 28 star-forming galaxies at z ~ 2–2.6, using adaptive optics assisted integral field observations from SINFONI on the Very Large Telescope. The narrow and broad components of the Hα emission are used to simultaneously determine the local star formation rate surface density (${{\rm{\Sigma }}}_{\mathrm{SFR}}$), and the outflow velocity ${v}_{\mathrm{out}}$ and mass outflow rate ${\dot{M}}_{\mathrm{out}}$, respectively. We find clear evidence for faster outflows with larger mass loading factors at higher ${{\rm{\Sigma }}}_{\mathrm{SFR}}$. The outflow velocities scale as ${v}_{\mathrm{out}}$ ∝ ${{\rm{\Sigma }}}_{\mathrm{SFR}}$ 0.34±0.10, which suggests that the outflows may be driven by a combination of mechanical energy released by supernova explosions and stellar winds, as well as radiation pressure acting on dust grains. The majority of the outflowing material does not have sufficient velocity to escape from the galaxy halos, but will likely be re-accreted and contribute to the chemical enrichment of the galaxies. In the highest ${{\rm{\Sigma }}}_{\mathrm{SFR}}$ regions the outflow component contains an average of ~45% of the Hα flux, while in the lower ${{\rm{\Sigma }}}_{\mathrm{SFR}}$ regions only ~10% of the Hα flux is associated with outflows. The mass loading factor, η = ${\dot{M}}_{\mathrm{out}}$/SFR, is positively correlated with ${{\rm{\Sigma }}}_{\mathrm{SFR}}$ but is relatively low even at the highest ${{\rm{\Sigma }}}_{\mathrm{SFR}}$: η lesssim 0.5 × (380 cm−3/n e ). This may be in tension with the η gsim 1 required by cosmological simulations, unless a significant fraction of the outflowing mass is in other gas phases and has sufficient velocity to escape the galaxy halos. S.T. is supported by the Smithsonian Astrophysical Observatory through the CfA Fellowship. application/pdf en_AU IOP Publishing © 2019 The authors The Astrophysical Journal Kiloparsec Scale Properties of Star Formation Driven Outflows at z~ 2.3 in the SINS/zC-SINF AO Survey Journal article Imported from ARIES 873 2019 020103 - Cosmology and Extragalactic Astronomy 020201 - Atomic and Molecular Physics u3102795xPUB1492 https://iopscience.iop.org/ Published Version Davies, Roger L, Max-Planck-Institut für Extraterrestrische Physik Förster Schreiber, Natascha M F, Max-Planck-Institut für extraterrestrische Physik Übler, H., Max-Planck-Institut für extraterrestrische Physik Genzel, R, Max Planck Institute for Extraterrestrial Physics Lutz, Dieter, Max-Planck-Institut für extraterrestrische Physik Renzini, Alvio, INAF-Osservatorio Astronomico di Padova Tacchella, S., Harvard-Smithsonian Center for Astrophysics Tacconi, L J, Max Planck Institute for Extraterrestrial Physics Belli, Sirio, Max-Planck-Institut für extraterrestrische Physik Burkert, Andreas, Max-Planck-Institut fuer extraterrestrische Physik Wisnioski, Emily, College of Science, ANU http://purl.org/au-research/grants/arc/CE170100013 2 1 22 10.3847/1538-4357/ab06f1 970102 - Expanding Knowledge in the Physical Sciences 2020-12-27T07:23:39Z 2-s2.0-85064445104 Open Access https://v2.sherpa.ac.uk/id/publication/6401/..."author can archive publisher's version/PD" from SHERPA/RoMEO site as at 02/05/2022 ANU Research Publications