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        The SAMI Galaxy Survey: : extraplanar gas, galactic winds, and their association with star formation history

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        MNRAS_2016_Ho_1257_78.pdf (PDF, 13Mb)
        Author
        Ho, I-Ting
        Medling, Anne M.
        Bland-Hawthorn, Joss
        Groves, Brent
        Kewley, Lisa J.
        Kobayashi, Chiaki
        Dopita, Michael A.
        Leslie, Sarah K.
        Sharp, Rob
        Allen, James T.
        Bourne, Nathan
        Bryant, Julia J.
        Cortese, Luca
        Croom, Scott M.
        Dunne, Loretta
        Fogarty, L. M. R.
        Goodwin, Michael
        Green, Andy W.
        Konstantopoulos, Iraklis S.
        Lawrence, Jon S.
        Lorente, Nuria P. F.
        Owers, Matt S.
        Richards, Samuel
        Sweet, Sarah M.
        Tescari, Edoardo
        Valiante, Elisabetta
        Attention
        2299/17398
        Abstract
        We investigate a sample of 40 local, main-sequence, edge-on disc galaxies using integral field spectroscopy with the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey to understand the link between properties of the extraplanar gas and their host galaxies. The kinematics properties of the extraplanar gas, including velocity asymmetries and increased dispersion, are used to differentiate galaxies hosting large-scale galactic winds from those dominated by the extended diffuse ionized gas. We find rather that a spectrum of diffuse gas-dominated to wind dominated galaxies exist. The wind-dominated galaxies span a wide range of star formation rates ($-1 \lesssim \log({\rm SFR/M_{\odot} yr^{-1}}) \lesssim 0.5$) across the whole stellar mass range of the sample ($8.5 \lesssim \log({\rm M_{*}/M_{\odot}}) \lesssim 11$). The wind galaxies also span a wide range in SFR surface densities ($10^{-3} \textrm{--} 10^{-1.5}\rm~M_{\odot} ~yr^{-1}~kpc^{-2}$) that is much lower than the canonical threshold of $\rm0.1~M_{\odot} ~yr^{-1}~kpc^{-2}$. The wind galaxies on average have higher SFR surface densities and higher $\rm H\delta_A$ values than those without strong wind signatures. The enhanced $\rm H\delta_A$ indicates that bursts of star formation in the recent past are necessary for driving large-scale galactic winds. We demonstrate with Sloan Digital Sky Survey data that galaxies with high SFR surface density have experienced bursts of star formation in the recent past. Our results imply that the galactic winds revealed in our study are indeed driven by bursts of star formation, and thus probing star formation in the time domain is crucial for finding and understanding galactic winds.
        Publication date
        2016-04-01
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stw017
        Other links
        http://hdl.handle.net/2299/17398
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