TY - JOUR
T1 - Reconciling the results of the z ∼2 MOSDEF and KBSS-MOSFIRE Surveys
AU - Runco, Jordan N.
AU - Reddy, Naveen A.
AU - Shapley, Alice E.
AU - Steidel, Charles C.
AU - Sanders, Ryan L.
AU - Strom, Allison L.
AU - Coil, Alison L.
AU - Kriek, Mariska
AU - Mobasher, Bahram
AU - Pettini, Max
AU - Rudie, Gwen C.
AU - Siana, Brian
AU - Topping, Michael W.
AU - Trainor, Ryan F.
AU - Freeman, William R.
AU - Shivaei, Irene
AU - Azadi, Mojegan
AU - Price, Sedona H.
AU - Leung, Gene C.K.
AU - Fetherolf, Tara
AU - De Groot, Laura
AU - Zick, Tom
AU - Fornasini, Francesca M.
AU - Barro, Guillermo
N1 - Publisher Copyright:
© 2022 The Author(s)
PY - 2022/7/1
Y1 - 2022/7/1
N2 - The combination of the MOSDEF and KBSS-MOSFIRE surveys represents the largest joint investment of Keck/MOSFIRE time to date, with ∼3000 galaxies at 1.4 z 3.8, roughly half of which are at z ∼2. MOSDEF is photometric- and spectroscopic-redshift selected with a rest-optical magnitude limit, while KBSS-MOSFIRE is primarily selected based on rest-UV colours and a rest-UV magnitude limit. Analysing both surveys in a uniform manner with consistent spectral-energy- distribution (SED) models, we find that the MOSDEF z ∼2 targeted sample has higher median M ∗and redder rest U −V colour than the KBSS-MOSFIRE z ∼2 targeted sample, and smaller median SED-based SFR and sSFR (SFR(SED) and sSFR(SED)). Specifically, MOSDEF tar geted a larger population of red galaxies with U −V and V −J >1.25, while KBSS-MOSFIRE contains more young galaxies with intense star formation. Despite these differences in the z ∼2 targeted samples, the subsets of the surveys with multiple emission lines detected and analysed in previous work are much more similar. All median host-galaxy properties with the exception of stellar population age -i.e. M ∗, SFR(SED), sSFR(SED), A V , and UVJ colours -agree within the uncertainties. Additionally, when uniform emission-line fitting and stellar Balmer absorption correction techniques are applied, there is no significant offset between both samples in the [O III ] λ5008/H βversus [N II ] λ6585/H αdiagnostic diagram, in contrast to previously reported discrepancies. We can now combine the MOSDEF and KBSS-MOSFIRE surv e ys to form the largest z ∼2 sample with moderate-resolution rest-optical spectra and construct the fundamental scaling relations of star-forming galaxies during this important epoch.
AB - The combination of the MOSDEF and KBSS-MOSFIRE surveys represents the largest joint investment of Keck/MOSFIRE time to date, with ∼3000 galaxies at 1.4 z 3.8, roughly half of which are at z ∼2. MOSDEF is photometric- and spectroscopic-redshift selected with a rest-optical magnitude limit, while KBSS-MOSFIRE is primarily selected based on rest-UV colours and a rest-UV magnitude limit. Analysing both surveys in a uniform manner with consistent spectral-energy- distribution (SED) models, we find that the MOSDEF z ∼2 targeted sample has higher median M ∗and redder rest U −V colour than the KBSS-MOSFIRE z ∼2 targeted sample, and smaller median SED-based SFR and sSFR (SFR(SED) and sSFR(SED)). Specifically, MOSDEF tar geted a larger population of red galaxies with U −V and V −J >1.25, while KBSS-MOSFIRE contains more young galaxies with intense star formation. Despite these differences in the z ∼2 targeted samples, the subsets of the surveys with multiple emission lines detected and analysed in previous work are much more similar. All median host-galaxy properties with the exception of stellar population age -i.e. M ∗, SFR(SED), sSFR(SED), A V , and UVJ colours -agree within the uncertainties. Additionally, when uniform emission-line fitting and stellar Balmer absorption correction techniques are applied, there is no significant offset between both samples in the [O III ] λ5008/H βversus [N II ] λ6585/H αdiagnostic diagram, in contrast to previously reported discrepancies. We can now combine the MOSDEF and KBSS-MOSFIRE surv e ys to form the largest z ∼2 sample with moderate-resolution rest-optical spectra and construct the fundamental scaling relations of star-forming galaxies during this important epoch.
KW - galaxies: ISM
KW - galaxies: evolution
KW - galaxies: high-redshift
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U2 - 10.1093/mnras/stac1115
DO - 10.1093/mnras/stac1115
M3 - Article
AN - SCOPUS:85132971133
SN - 0035-8711
VL - 513
SP - 3871
EP - 3892
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -