Authod: Ryan L. Sanders et al.(2018)

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Authod: Ryan L. Sanders et al.(2018) The MOSDEF Survey: A Stellar Mass–SFR–Metallicity Relation Exists at z≈2.3 Authod: Ryan L. Sanders et al.(2018) HuangChi , 2018.9.11

Background The MOSFIRE Deep Evolution Field (MOSDEF) survey is a large multi-year project with MOSFIRE(The Multi-Object Spectrograph for Infrared Exploration) on the 10-m Keck I telescope on Mauna Kea, Hawaii. With MOSDEF we observe the stellar, gaseous, metal, dust, and black hole content of ~1500 galaxies. This paper uses z≈2.3 data. J band: 1.153-1.342µm ([OII] λλ3726, 3729) H band:1.458-1.804µm (Hβ [OIII] λλ4959,5007 ) K band:1.954-2.397 µm (Hα, [N II] λ6584, and [SII] λλ6717, 6731 )

Background The mass-metallicity(M-Z) relation shows that low-luminosity, low-mass galaxies have lower metallicity than more massive galaxies, presumably due to less efficient star formation and higher metal loss during supernovae events and galactic-scale winds Andrew&Martini(2013)

Sample

Sample

Sample Andrew&Martini(2013)

Derived quantities

Derived quantities 3.Metallicity

Stacking

Results 1.M-sSFR relation

Results 2.M-Z relation

Results 2.M-SFR-Z relation(FMR) X axis: residuals around the M-sSFR relation Y axis: residuals around the M-Z relation Red squares: medians in bins of ∆log(SFR) Stars: M-∆sSFR stacks

Results

Results

Results 3.FMR evolution with reshift

Conclusions 1.Using three different emission line ratios(O3N2,N2 and N2O2) , we detect a M-SFR-Z relation at z≈2.3. 2.Results based on O3 and R23 are consistent. 3.O32 do not display the presence of M-SFR-Z relation of significant redshift evolution in metallicity at fixed M and SFR. 4.The M-SFR-Z relation is similar in strength to a cosmological hydrodynamical simulation of Dave et al.(2017). 5.The M-SFR-Z relation evolves with redshift , z≈2.3 galaxies have 0.1 dex lower metallicity than z≈0 galaxies at fixed M and SFR.