학술논문
Reconciling the Results of the z~2 MOSDEF and KBSS-MOSFIRE Surveys
Document Type
Working Paper
Author
Runco, Jordan N.; Reddy, Naveen A.; Shapley, Alice E.; Steidel, Charles C.; Sanders, Ryan L.; Strom, Allison L.; Coil, Alison L.; Kriek, Mariska; Mobasher, Bahram; Pettini, Max; Rudie, Gwen C.; Siana, Brian; Topping, Michael W.; Trainor, Ryan F.; Freeman, William R.; Shivaei, Irene; Azadi, Mojegan; Price, Sedona H.; Leung, Gene C. K.; Fetherolf, Tara; de Groot, Laura; Zick, Tom; Fornasini, Francesca M.; Barro, Guillermo
Source
MNRAS, 513, 3871 (2022)
Subject
Language
Abstract
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 colors and a rest-UV magnitude limit. Analyzing both surveys in a uniform manner with consistent spectral-energy-distribution (SED) models, we find that the MOSDEF z~2 targeted sample has a higher median M_* and redder rest U-V color than the KBSS-MOSFIRE z~2 targeted sample, and a smaller median SED-based SFR and sSFR (SFR(SED) and sSFR(SED)). Specifically, MOSDEF targeted 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 analyzed in previously published 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 colors -- agree within the uncertainties. Additionally, when uniform emission-line fitting and stellar Balmer absorption correction techniques are applied, there is no significant offset between the two samples in the [OIII]$\lambda$5008/H$\beta$ vs. [NII]$\lambda$6585/H$\alpha$ diagnostic diagram, in contrast to previously-reported discrepancies. We can now combine the MOSDEF and KBSS-MOSFIRE surveys 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.
Comment: 23 pages, 14 figures, published in MNRAS
Comment: 23 pages, 14 figures, published in MNRAS