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The Outflowing [O ii] Nebulae of Compact Starburst Galaxies at z ∼ 0.5

High-velocity outflows are ubiquitous in compact, massive (M * ∼ 1011 M ⊙), z ∼ 0.5 galaxies with extreme star formation surface densities (ΣSFR ∼ 2000 M ⊙ yr−1 kpc−2). We have previously detected and characterized these outflows using Mg ii absorption lines. To probe their full extent, we present K...

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Main Authors: Perrotta, Serena (Author) , Coil, Alison L. (Author) , Rupke, David (Author) , Ning, Wenmeng (Author) , Duong, Brendan (Author) , Diamond-Stanic, Aleksandar M. (Author) , Fielding, Drummond B. (Author) , Geach, James E. (Author) , Hickox, Ryan C. (Author) , Moustakas, John (Author) , Rudnick, Gregory H. (Author) , Sell, Paul H. (Author) , Swiggum, Cameren N. (Author) , Tremonti, Christy A. (Author)
Format: Article (Journal)
Language:English
Published: 2024
In: The astrophysical journal
Year: 2024, Volume: 975, Issue: 2, Pages: 1-29
ISSN:1538-4357
DOI:10.3847/1538-4357/ad7b0c
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.3847/1538-4357/ad7b0c
Verlag, kostenfrei, Volltext: https://dx.doi.org/10.3847/1538-4357/ad7b0c
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Author Notes:Serena Perrotta, Alison L. Coil, David S. N. Rupke, Wenmeng Ning, Brendan Duong, Aleksandar M. Diamond-Stanic, Drummond B. Fielding, James E. Geach, Ryan C. Hickox, John Moustakas, Gregory H. Rudnick, Paul H. Sell, Cameren N. Swiggum, and Christy A. Tremonti
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Summary:High-velocity outflows are ubiquitous in compact, massive (M * ∼ 1011 M ⊙), z ∼ 0.5 galaxies with extreme star formation surface densities (ΣSFR ∼ 2000 M ⊙ yr−1 kpc−2). We have previously detected and characterized these outflows using Mg ii absorption lines. To probe their full extent, we present Keck/KCWI integral field spectroscopy of the [O ii] and Mg ii emission nebulae surrounding all of the 12 galaxies in this study. We find that [O ii] is more effective than Mg ii in tracing low surface brightness, extended emission in these galaxies. The [O ii] nebulae are spatially extended beyond the stars, with radial extent R 90 between 10 and 40 kpc. The nebulae exhibit nongravitational motions, indicating galactic outflows with maximum blueshifted velocities ranging from −335 to −1920 km s−1. The outflow kinematics correlate with the bursty star formation histories of these galaxies. Galaxies with the most recent bursts of star formation (within the last <3 Myr) exhibit the highest central velocity dispersions (σ ≳ 400 km s−1), while the oldest bursts have the lowest-velocity outflows. Many galaxies exhibit both high-velocity cores and more extended, slower-moving gas indicative of multiple outflow episodes. The slower, larger outflows occurred earlier and have decelerated as they propagate into the circumgalactic medium and mix on timescales ≳50 Myr.
Item Description:Online veröffentlicht: 7. November 2024
Gesehen am 20.08.2025
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/ad7b0c

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