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Systematic study of outflows in the Local Universe using CALIFA: I. Sample selection and main properties | | Carlos Lopez Coba
; Sebastian F. Sanchez
; Joss Bland-Hawthorn
; Alexei V. Moiseev
; Irene Cruz-Gonzalez
; Ruben Garcia-Benito
; Jorge K. Barrera-Ballesteros
; Lluis Galbany
; | | Date: |
7 Nov 2018 | | Abstract: | We present a sample of 17 objects from the CALIFA survey where we find
initial evidence of galactic winds based on their off-axis ionization
properties. We identify the presence of outflows using various optical
diagnostic diagrams (e.g., EW(H$alpha$), [Nii]/H$alpha$, [Sii]/H$alpha$,
[Oi]/H$alpha$ line-ratio maps). We find that all 17 candidate outflow galaxies
lie along the sequence of active star formation in the M$_star$ vs.
star-formation rate diagram, without a clear excess in the integrated SFR. The
location of galaxies along the star-formation main sequence (SFMS) does not
influence strongly the presence or not of outflows. The analysis of the
star-formation rate density ($Sigma_{
m SFR}$) reveals that the CALIFA
sources present higher values when compared with normal star-forming galaxies.
The strength of this relation depends on the calibrator used to estimate the
SFR. This excess in $Sigma_{
m SFR}$ is significant within the first
effective radius supporting the idea that most outflows are driven by processes
in the inner regions of a galaxy. We find that the molecular gas mass density
($Sigma_mathrm{gas}$) is a key parameter that plays an important role in the
generation of outflows through its association with the local SFR. The
canonical threshold reported for the generation of outflows -- $Sigma_{
m
SFR}>0.1$ $mathrm{M}_odot mathrm{yr}^{-1} mathrm{kpc}^{-2}$ -- is only
marginally exceeded in our sample. Within the Kennicutt-Schmidt diagram we
propose a domain for galaxies hosting starburst-driven outflows defined by
$Sigma_{
m
SFR}>10^{-2} ,mathrm{M}_odot mathrm{yr}^{-1} mathrm{kpc}^{-2}$ and
$Sigma_mathrm{gas}>10^{1.2} , mathrm{M}_odot mathrm{pc}^{-2}$ within a
central kiloparcec region. | | Source: | arXiv, 1811.1253 | | Services: | Forum | Review | PDF | Favorites | |
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