J/A+A/685/A99 Galactic outflows in low-mass galaxies spectra (Maiolino+, 2024)
JADES: The incidence rate and properties of galactic outflows in low-mass
galaxies across 3 < z < 9.
Carniani S., Venturi G., Parlanti E., de Graaff A., Maiolino R.,
Arribas S., Bonaventura N., Boyett K., Bunker A.J., Cameron A.J.,
Charlot S., Chevallard J., Curti M., Curtis-Lake E., Eisenstein D.J.,
Giardino G., Hausen R., Kumari N., Maseda M.V., Nelson E., Perna M.,
Rix H.-W., Robertson B., Rodriguez Del Pino B., Sandles L., Scholtz J.,
Simmonds C., Smit R., Tacchella S., Uebler H., Williams C.C., Willott C.,
Witstok J.
<Astron. Astrophys. 685, A99 (2024)>
=2024A&A...685A..99C 2024A&A...685A..99C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Spectra, infrared
Keywords: ISM: jets and outflows - galaxies: evolution -
galaxies: high-redshift - galaxies: ISM -
galaxies: kinematics and dynamics
Abstract:
We investigate the incidence and properties of ionised gas outflows in
a sample of 52 galaxies with stellar masses between 107M☉ and
109M☉ observed with ultra-deep JWST/NIRSpec MSA spectroscopy
as part of the JWST Advanced Deep Extragalactic Survey (JADES). The
high-spectral resolution (R2700) NIRSpec observations allowed us to
identify for the first time the potential signature of outflows in the
rest-frame optical nebular lines in low-mass galaxies at z>4. The
incidence fraction of ionised outflows, traced by broad components, is
about 25-40%, depending on the intensity of the emission lines. The
low incidence fraction might be due to both the sensitivity limit and
the fact that outflows are not isotropic, but have a limited opening
angle, which only results in detection when this is directed toward
our line of sight. Evidence for outflows increases slightly with
stellar mass and star formation rate. The median velocity and
mass-loading factor (i.e. the ratio of the mass outflow rate and star
formation rate) of the outflowing ionised gas are 350km/s and
eta=2.0+1.6-1.5, respectively. These are 1.5 and 100 times higher
than the typical values observed in local dwarf galaxies. Some of
these high-redshift outflows can escape the gravitational potential of
the galaxy and dark matter halo and enrich the circumgalactic medium
and possibly even the intergalactic medium. Our results indicate that
outflows can significantly impact the star formation activity in
low-mass galaxies within the first 2Gyr of the Universe
Description:
The file contains the NIRSpec spectra of galaxies reporting a broad
component in the profile of the optical lines. Wavelengths are in m,
Fluxes are in W/m3.
Raw data and reduced data are available for download
(https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 69 13 List of studied galaxies
sp/* . 13 Individual spectra
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Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- Id NIRSpec identification number of the galaxy
10- 14 F5.3 --- z Redshift
16- 24 F9.6 deg RAdeg Rigth ascension (J2000)
26- 35 F10.6 deg DEdeg Declination (J2000)
37- 69 A33 --- FileName Name of the spectrum file in subdirectory sp
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 11 E11.6 m lambda Wavelength
13- 24 E12.6 W/m3 Flux ?=- Flux
26- 36 E11.6 W/m3 e_Flux ?=- rms uncertainty on Flux
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Acknowledgements:
Stefano Carniani, stefano.carniani(at)sns.it
(End) Patricia Vannier [CDS] 19-Apr-2024