J/MNRAS/500/4229 Star-forming galaxies at z~=0.6-1.8 (Gillman+, 2021)
The evolution of gas-phase metallicity and resolved abundances in star-forming
galaxies at z ~= 0.6-1.8.
Gillman S., Tiley A.L., Swinbank A.M., Dudzeviciute U., Sharples R.M.,
Smail I., Harrison C.M., Bunker A.J., Bureau M., Cirasuolo M., Magdis G.E.,
Mendel T., Stott J.P.
<Mon. Not. R. Astron. Soc. 500, 4229 (2021)>
=2021MNRAS.500.4229G 2021MNRAS.500.4229G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Star Forming Region ; Redshifts ; Abundances ; Optical
Keywords: galaxies: abundances - galaxies: kinematics and dynamics -
galaxies: high-redshift
Abstract:
We present an analysis of the chemical abundance properties of ∼650
star-forming galaxies at z~=0.6-1.8. Using integral-field observations
from the K-band multi-object spectrograph (KMOS), we quantify the
[NII]/Hα emission-line ratio, a proxy for the gas-phase oxygen
abundance within the interstellar medium. We define the stellar
mass-metallicity relation at z~=0.6-1.0 and z~=1.2-1.8 and analyse the
correlation between the scatter in the relation and fundamental galaxy
properties (e.g. Hα star formation rate, Hα specific star
formation rate, rotation dominance, stellar continuum half-light
radius, and Hubble-type morphology). We find that for a given stellar
mass, more highly star-forming, larger, and irregular galaxies have
lower gas-phase metallicities, which may be attributable to their
lower surface mass densities and the higher gas fractions of irregular
systems. We measure the radial dependence of gas- phase metallicity in
the galaxies, establishing a median, beam smearing corrected,
metallicity gradient of {DELTA}Z/{DELTA}R=0.002±0.004dex/kpc,
indicating on average there is no significant dependence on radius.
The metallicity gradient of a galaxy is independent of its rest-frame
optical morphology, whilst correlating with its stellar mass and
specific star formation rate, in agreement with an inside-out model of
galaxy evolution, as well as its rotation dominance. We quantify the
evolution of metallicity gradients, comparing the distribution of
{DELTA}Z/{DELTA}R in our sample with numerical simulations and
observations at z~=0-3. Galaxies in our sample exhibit flatter
metallicity gradients than local star- forming galaxies, in agreement
with numerical models in which stellar feedback plays a crucial role
redistributing metals.
Description:
To provide statistically meaningful conclusions about the
metallicities of galaxies in the distant Universe, we utilize 644
star-forming galaxies drawn from two large K-band multi-object
spectrograph (KMOS) programmes at z~=0.6-1.8. The galaxies in our
sample are drawn from the KMOS Redshift One Spectroscopic Survey
(KROSS; Stott et al., 2016MNRAS.457.1888S 2016MNRAS.457.1888S; Harrison et al.,
2017MNRAS.467.1965H 2017MNRAS.467.1965H, Cat. J/MNRAS/467/1965) at z~=0.6-1.0 (448
galaxies) and the KMOS Galaxy Evolution Survey (KGES; Gillman et al.
2019MNRAS.486..175G 2019MNRAS.486..175G, Cat. J/MNRAS/486/175, Tiley et al.,
2021MNRAS.506..323T 2021MNRAS.506..323T, Cat. J/MNRAS/506/323) at z~=1.2-1.8 (196
galaxies).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
kross.dat 94 743 KROSS sample data
kges.dat 100 288 KGES sample data
--------------------------------------------------------------------------------
See also:
J/MNRAS/467/1965 : KMOS Redshift One Spectroscopic Survey (Harrison+, 2017)
J/MNRAS/506/323 : Kinematic study of KGES galaxies (Tiley+, 2021)
Byte-by-byte Description of file: kross.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- KID KROSS ID
5- 14 F10.6 deg RAdeg Right ascension (J2000)
16- 25 F10.6 deg DEdeg Declination (J2000)
27- 38 E12.6 Msun Mass Stellar mass
40- 47 F8.6 --- z Best redshift from Hα line
49- 57 F9.6 Msun/Myr SFR Hα star formation rate
59- 66 F8.6 --- NHratiogal ?=- Galaxy integrated NII/Hα index
68- 76 F9.6 --- e_NHratiogal ?=- Galaxy INtegrated NII/Hα index
error
78- 85 F8.6 --- 12+log(O/H) ?=- Galaxy integrated oxygen abundance
87- 94 F8.6 --- e_12+log(O/H) ?=- Galaxy integrated oxygen abundance error
--------------------------------------------------------------------------------
Byte-by-byte Description of file: kges.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- KGES KGES survey ID (KGES_NNN)
10- 19 F10.6 deg RAdeg Right ascension (J2000)
21- 30 F10.6 deg DEdeg Declination (J2000)
32- 43 E12.6 Msun Mstar Stellar mass
45- 52 F8.6 --- z Best redshift from Hα line
54- 64 F11.6 Msun/Myr SFR ?=-999 Hα star formation rate
66- 73 F8.6 --- NHratiogal ?=- Galaxy integrated NII/Hα index
75- 82 F8.6 --- e_NHratiogal ?=- Galaxy integrated NII/Hα index
error
84- 91 F8.6 --- 12+log(O/H) ?=- Galaxy integrated oxygen abundance
93-100 F8.6 --- e_12+log(O/H) ?=- Galaxy integrated oxygen abundance
error
--------------------------------------------------------------------------------
Acknowledgements:
Steven Richard Gillman, srigi(at)space.dtu.dk
(End) Patricia Vannier [CDS] 18-Mar-2025