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The impact of stellar feedback from velocity-dependent ionized gas maps - a MUSE view of Haro 11
Stockholm Univ, AlbaNova, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
Stockholm Univ, AlbaNova, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
Stockholm Univ, AlbaNova, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
Stockholm Univ, AlbaNova, Oskar Klein Ctr, Dept Astron, SE-10691 Stockholm, Sweden.
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 3, p. 3183-3198Article in journal (Refereed) Published
Abstract [en]

We have used the capability of the Multi-Unit Spectroscopic Explorer (MUSE) instrument to explore the impact of stellar feedback at large scales in Haro 11, a galaxy under extreme starburst condition and one of the first galaxies where Lyman continuum (LyC) has been detected. Using H alpha, [O III] lambda 5007, and [O I]) lambda 6300 emission lines from deep MUSE observations, we have constructed a sequence of velocity-dependent maps of the H alpha emission, the state of the ionized gas, and a tracer of fast shocks. These allowed us to investigate the ionization structure of the galaxy in 50 km s(-1) bins over a velocity range of -400 to 350 km s(-1). The ionized gas in Haro 11 is assembled by a rich arrangement of structures, such as superbubbles, filaments, arcs, and galactic ionized channels, whose appearances change drastically with velocity. The central star-forming knots and the star-forming dusty arm are the main engines that power the strong mechanical feedback in this galaxy, although with different impact on the ionization structure. Haro 11 appears to leak LyC radiation in many directions. We found evidence of a kpc-scale fragmented superbubble that may have cleared galactic scale channels in the ISM. Additionally, the Southwestern hemisphere is highly ionized in all velocities, hinting at a density hound scenario. A compact kpc-scale structure of lowly ionized gas coincides with the diffuse Ly alpha emission and the presence of fast shocks. Finally, we find evidence that a significant fraction of the ionized gas mass may escape the gravitational potential of the galaxy.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 487, no 3, p. 3183-3198
Keywords [en]
ISM: jets and outflows, ISM: structure, galaxies: individual: Haro 11, galaxies: ISM, galaxies: kinematics and dynamics, galaxies: starburst
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-392139DOI: 10.1093/mnras/stz1414ISI: 000478053200018OAI: oai:DiVA.org:uu-392139DiVA, id: diva2:1347827
Funder
Swedish Research CouncilSwedish National Space BoardAvailable from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved

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Bergvall, Nils

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