The resolved chemical abundance properties within the interstellar medium of star-forming galaxies at z approximate to 1.5
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The resolved chemical abundance properties within the interstellar medium of star-forming galaxies at z approximate to 1.5. / Gillman, S.; Puglisi, A.; Dudzeviciute, U.; Swinbank, A. M.; Tiley, A. L.; Harrison, C. M.; Molina, J.; Sharples, R. M.; Bower, R. G.; Cirasuolo, M.; Ibar, Edo; Obreschkow, D.
In: Monthly Notices of the Royal Astronomical Society, Vol. 512, No. 3, 04.04.2022, p. 3480-3499.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The resolved chemical abundance properties within the interstellar medium of star-forming galaxies at z approximate to 1.5
AU - Gillman, S.
AU - Puglisi, A.
AU - Dudzeviciute, U.
AU - Swinbank, A. M.
AU - Tiley, A. L.
AU - Harrison, C. M.
AU - Molina, J.
AU - Sharples, R. M.
AU - Bower, R. G.
AU - Cirasuolo, M.
AU - Ibar, Edo
AU - Obreschkow, D.
PY - 2022/4/4
Y1 - 2022/4/4
N2 - We exploit the unprecedented depth of integral field data from the KMOS Ultra-deep Rotational Velocity Survey (KURVS) to analyse the strong (H alpha) and forbidden ([MI], [SII]) emission line ratios in 22 main-sequence galaxies at z approximate to 1.5. Using the (NII]/H alpha emission-line ratio, we confirm the presence of the stellar mass-gas-phase metallicity relation at this epoch, with galaxies exhibiting on average 0.13 +/- 0.04 dex lower gas-phase metallicity (12 + log(O/H)(M13) = 8.40 +/- 0.03) for a given stellar mass (log(10)(M-*[M-circle dot] = 10.1 +/- 0.1) .than local main-sequence galaxies. We determine the galaxy-integrated [SII] doublet ratio, with a median value of [SII]lambda 6716/lambda 6731 = 1.26 +/- 0.14 equivalent to an electron density of log(10)(n(e)[cm(-3)]) = 1.95 +/- 0.12. Utilising CANDELS HST multi-band imaging we define the pixel surface-mass and star-formation rate density in each galaxy and spatially resolve the fundamental metallicity relation at z approximate to 1.5, finding an evolution of 0.05 +/- 0.01 dex compared to the local relation. We quantify the intrinsic gas-phase metallicity gradient within the galaxies using the [NII]/H alpha calibration, finding a median annuli-based gradient of Delta Z/Delta R = -0.015 +/- 0.005 dex kpc(-1). Finally, we examine the azimuthal variations in gas-phase metallicity, which show a negative correlation with the galaxy integrated star-formation rate surface density (r(s) = -0.40, p(s) = 0.07) but no connection to the galaxies kinematic or morphological properties nor radial variations in stellar mass surface density or star formation rate surface density. This suggests both the radial and azimuthal variations in interstellar medium properties are connected to the galaxy integrated density of recent star formation.
AB - We exploit the unprecedented depth of integral field data from the KMOS Ultra-deep Rotational Velocity Survey (KURVS) to analyse the strong (H alpha) and forbidden ([MI], [SII]) emission line ratios in 22 main-sequence galaxies at z approximate to 1.5. Using the (NII]/H alpha emission-line ratio, we confirm the presence of the stellar mass-gas-phase metallicity relation at this epoch, with galaxies exhibiting on average 0.13 +/- 0.04 dex lower gas-phase metallicity (12 + log(O/H)(M13) = 8.40 +/- 0.03) for a given stellar mass (log(10)(M-*[M-circle dot] = 10.1 +/- 0.1) .than local main-sequence galaxies. We determine the galaxy-integrated [SII] doublet ratio, with a median value of [SII]lambda 6716/lambda 6731 = 1.26 +/- 0.14 equivalent to an electron density of log(10)(n(e)[cm(-3)]) = 1.95 +/- 0.12. Utilising CANDELS HST multi-band imaging we define the pixel surface-mass and star-formation rate density in each galaxy and spatially resolve the fundamental metallicity relation at z approximate to 1.5, finding an evolution of 0.05 +/- 0.01 dex compared to the local relation. We quantify the intrinsic gas-phase metallicity gradient within the galaxies using the [NII]/H alpha calibration, finding a median annuli-based gradient of Delta Z/Delta R = -0.015 +/- 0.005 dex kpc(-1). Finally, we examine the azimuthal variations in gas-phase metallicity, which show a negative correlation with the galaxy integrated star-formation rate surface density (r(s) = -0.40, p(s) = 0.07) but no connection to the galaxies kinematic or morphological properties nor radial variations in stellar mass surface density or star formation rate surface density. This suggests both the radial and azimuthal variations in interstellar medium properties are connected to the galaxy integrated density of recent star formation.
KW - galaxies: abundances
KW - galaxies: high-redshift
KW - galaxies: ISM
KW - SDSS-IV MANGA
KW - GAS-PHASE METALLICITY
KW - SPECTROSCOPIC SURVEY KROSS
KW - SPECTRAL ENERGY-DISTRIBUTION
KW - FMOS-COSMOS SURVEY
KW - MASS-METALLICITY
KW - ANGULAR-MOMENTUM
KW - STARBURST GALAXIES
KW - SCALING RELATIONS
KW - OXYGEN ABUNDANCE
U2 - 10.1093/mnras/stac580
DO - 10.1093/mnras/stac580
M3 - Journal article
VL - 512
SP - 3480
EP - 3499
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 319567245