J/MNRAS/493/3081 Outflows in star-forming galaxies (Roberts-Borsani+, 2020)
Outflows in star-forming galaxies: Stacking analyses of resolved winds and the
relation to their hosts' properties.
Roberts-Borsani G.W., Saintonge A., Masters K.L., Stark D.V.
<Mon. Not. R. Astron. Soc., 493, 3081-3097 (2020)>
=2020MNRAS.493.3081R 2020MNRAS.493.3081R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Star Forming Region ; Redshifts ; Positional data ;
Optical
Keywords: ISM: jets and outflows - galaxies: evolution - galaxies: starburst
Abstract:
Outflows form an integral component in regulating the gas cycling in
and out of galaxies, although their impact on the galaxy hosts is
still poorly understood. Here we present an analysis of 405 high mass
(logM*/M☉≥10), star-forming galaxies (excluding AGN) with low
inclinations at z∼0, using stacking techniques of the Na D
λλ5889,5895Å neutral gas tracer in IFU observations
from the MaNGA DR15 survey. We detect outflows in the central regions
of 78/405 galaxies and determine their extent and power through the
construction of stacked annuli. We find outflows are most powerful in
central regions and extend out to ∼1Re, with declining mass outflow
rates and loading factors as a function of radius. The stacking of
spaxels over key galaxy quantities reveals outflow detections in
regions of high ΣSFR (≳0.01M☉yr-1kpc-2) and
ΣM* (≥107M☉kpc-2) along the resolved main sequence.
Clear correlations with ΣSFR suggest it is the main regulator
of outflows, with a critical threshold of ∼0.01M☉yr-1kpc-2
needed to escape the weight of the disc and launch them. Furthermore,
measurements of the Hδ and Dn4000 indices reveal virtually
identical star formation histories between galaxies with outflows and
those without. Finally, through stacking of HI 21cm observations for a
subset of our sample, we find outflow galaxies show reduced HI gas
fractions at central velocities compared to their non-detection
control counterparts, suggestive of some removal of HI gas, likely in
the central regions of the galaxies, but not enough to completely
quench the host.
Description:
The SDSS-IV/Mapping Nearby Galaxies at APO (MaNGA; Bundy et al.
2015ApJ...798....7B 2015ApJ...798....7B) survey is an IFU survey of the local Universe
with the aim of obtaining spatially resolved spectra for an unbiased
sample of ∼10000 galaxies from the NASA-Sloan Atlas (NSA) catalogue,
with logM*/M☉≳9 at 0.01=<z=<0.15 by 2020.
Motivated by recent results from Roberts-Borsani & Saintonge
(2019MNRAS.482.4111R 2019MNRAS.482.4111R), we begin our selection by performing cuts on
galaxy stellar mass (logM*/M☉>10), SFR (corresponding to a
rough lower limit of the galaxy main-sequence defined by Saintonge et
al. 2016MNRAS.462.1749S 2016MNRAS.462.1749S) and inclination (i=<50°, derived from the
galaxy's r-band axial ratio, b/a) - three key galaxy properties known
to influence the detection rates of neutral gas outflows. The stellar
masses and SFRs used for this selection are taken from the Pipe3D
catalogue (Sanchez et al. 2018RMxAA..54..217S 2018RMxAA..54..217S), which for each galaxy
derives an SFR based on the integrated Hα luminosity, and the
axial ratio of the galaxy is taken from the NASA-Sloan Atlas
catalogue.
We report the flow galaxies and their main properties in Table A1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 75 92 The global properties of galaxies identified to
host outflows in their central regions
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate [7815/9888] MaNGA plate identifier
6- 10 I5 --- IFU MaNGA IFU identifier
12- 20 F9.5 deg RAdeg Right ascension (J2000) (1)
22- 29 F8.5 deg DEdeg Declination (J2000) (1)
31- 37 F7.5 --- z Redshift (1)
39- 43 F5.2 [Msun] logM* Logarithm of the stellar mass (2)
45- 49 F5.2 [Msun/yr] logSFR Logarithm of the star formation rate (2)
51- 55 F5.2 [-] log[OIII]/Ha Logarithm of the [OIII]/Hα line
ratio (2)
57- 61 F5.2 [-] log[NII]/Hb Logarithm of the [NII]/Hβ line
ratio (2)
63- 67 F5.2 deg i Inclination of the galaxy (1)
69- 75 A7 --- Type Detection of outflow or inflow
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Note (1): Values derived from the NSA catalogue
Note (2): Values derived from the Pipe3D catalogue. SFRs and stellar masses are
integrated quantities, whilst the line ratios refer to measurements
in the central 2.5arcsec of the galaxy.
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 20-Apr-2023