%0 Generic %1 bik2015vltmuse %A Bik, A. %A Östlin, G. %A Hayes, M. %A Adamo, A. %A Melinder, J. %A Amram, P. %D 2015 %K escape fraction ionized muse outflows %T A VLT/MUSE view of the highly ionized outflow cones in the nearby starburst ESO338-IG04 %U http://arxiv.org/abs/1503.06626 %X Despite the fact that the Ly$\alpha$ line is an important diagnostic for star formation at high redshift, the interpretation of its flux and line profile is difficult due to its resonance nature. Trends between the escape of Ly$\alpha$ photons and dust and ISM properties have been found, but detailed comparisons between Ly$\alpha$ emission and the properties of the gas in local high redshift analogues are vital to understand the relation between Ly$\alpha$ emission and galaxy properties. For the first time we can directly infer the properties of the ionized gas at the same location and comparable spatial scales of the extended Ly$\alpha$ halo around ESO 338-IG04. VLT/MUSE integral field spectra have been obtained. We use ionization parameter mapping of the SII/OIII line ratio and the kinematics of H$\alpha$ to study the ionization state and kinematics of the interstellar medium of ESO 338. The velocity map reveals two outflows. The entire central area of the galaxy is highly ionized by photons leaking from the HII regions around the youngest star clusters. Three highly ionized cones have been identified, of which one is associated with an outflow detected in the H$\alpha$. We propose a scenario where the outflows are created by mechanical feedback of the older clusters, while the highly ionized gas is caused by the hard ionizing photons emitted by the youngest clusters. A comparison with the Ly$\alpha$ map shows that the (approximately bipolar) asymmetries observed in the Ly$\alpha$ emission are consistent with the base of the outflows detected in H$\alpha$. No clear correlation with the ionization cones is found. The mechanical and ionization feedback of star clusters significantly changes the state of the ISM by creating ionized cones and outflows. The comparison with Ly$\alpha$ suggests that especially the outflows could facilitate the escape of Ly$\alpha$ photons.

@misc{bik2015vltmuse, abstract = {Despite the fact that the Ly$\alpha$ line is an important diagnostic for star formation at high redshift, the interpretation of its flux and line profile is difficult due to its resonance nature. Trends between the escape of Ly$\alpha$ photons and dust and ISM properties have been found, but detailed comparisons between Ly$\alpha$ emission and the properties of the gas in local high redshift analogues are vital to understand the relation between Ly$\alpha$ emission and galaxy properties. For the first time we can directly infer the properties of the ionized gas at the same location and comparable spatial scales of the extended Ly$\alpha$ halo around ESO 338-IG04. VLT/MUSE integral field spectra have been obtained. We use ionization parameter mapping of the [SII/OIII] line ratio and the kinematics of H$\alpha$ to study the ionization state and kinematics of the interstellar medium of ESO 338. The velocity map reveals two outflows. The entire central area of the galaxy is highly ionized by photons leaking from the HII regions around the youngest star clusters. Three highly ionized cones have been identified, of which one is associated with an outflow detected in the H$\alpha$. We propose a scenario where the outflows are created by mechanical feedback of the older clusters, while the highly ionized gas is caused by the hard ionizing photons emitted by the youngest clusters. A comparison with the Ly$\alpha$ map shows that the (approximately bipolar) asymmetries observed in the Ly$\alpha$ emission are consistent with the base of the outflows detected in H$\alpha$. No clear correlation with the ionization cones is found. The mechanical and ionization feedback of star clusters significantly changes the state of the ISM by creating ionized cones and outflows. The comparison with Ly$\alpha$ suggests that especially the outflows could facilitate the escape of Ly$\alpha$ photons.}, added-at = {2015-03-24T07:17:15.000+0100}, author = {Bik, A. and Östlin, G. and Hayes, M. and Adamo, A. and Melinder, J. and Amram, P.}, biburl = {https://www.bibsonomy.org/bibtex/295962ff94c1a7d4be97d4a3e4df043ea/miki}, description = {[1503.06626] A VLT/MUSE view of the highly ionized outflow cones in the nearby starburst ESO338-IG04}, interhash = {0edbb8a790708f74b072d659ada858a3}, intrahash = {95962ff94c1a7d4be97d4a3e4df043ea}, keywords = {escape fraction ionized muse outflows}, note = {cite arxiv:1503.06626Comment: Resubmitted to A&A after first comments of the referee, 4 pages, 2 figures}, timestamp = {2015-03-24T07:17:27.000+0100}, title = {A VLT/MUSE view of the highly ionized outflow cones in the nearby starburst ESO338-IG04}, url = {http://arxiv.org/abs/1503.06626}, year = 2015 }