2021MNRAS.505..903C

Query : 2021MNRAS.505..903C

2021MNRAS.505..903C - Mon. Not. R. Astron. Soc., 505, 903-920 (2021/July-3)

The NIRVANDELS Survey: a robust detection of α-enhancement in star-forming galaxies at z ≃ 3.4.

CULLEN F., SHAPLEY A.E., McLURE R.J., DUNLOP J.S., SANDERS R.L., TOPPING M.W., REDDY N.A., AMORIN R., BEGLEY R., BOLZONELLA M., CALABRO A., CARNALL A.C., CASTELLANO M., CIMATTI A., CIRASUOLO M., CRESCI G., FONTANA A., FONTANOT F., GARILLI B., GUAITA L., HAMADOUCHE M., HATHI N.P., MANNUCCI F., McLEOD D.J., PENTERICCI L., SAXENA A., TALIA M. and ZAMORANI G.

Abstract (from CDS):

We present results from the NIRVANDELS survey on the gas-phase metallicity (Zg, tracing O/H) and stellar metallicity (Z*, tracing Fe/H) of 33 star-forming galaxies at redshifts 2.95 < z < 3.80. Based on a combined analysis of deep optical and near-IR spectra, tracing the rest-frame far-ultraviolet (FUV; 1200-2000 Å) and rest-frame optical (3400-5500 Å), respectively, we present the first simultaneous determination of the stellar and gas-phase mass-metallicity relationships (MZRs) at z ≃ 3.4. In both cases, we find that metallicity increases with increasing stellar mass (M*) and that the power-law slope at M* <= 1010M☉ of both MZRs scales as Z ∝M*0.3. Comparing the stellar and gas-phase MZRs, we present direct evidence for super-solar O/Fe ratios (i.e. α-enhancement) at z > 3, finding (O/Fe) = 2.54 ± 0.38 x (O/Fe)☉, with no clear dependence on M*.

Abstract Copyright: © 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): galaxies: abundances - galaxies: high redshift

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1623 1
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
3 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1900 0

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