TY - JOUR
T1 - The SFR-M ∗ Correlation Extends to Low Mass at High Redshift
AU - Iyer, Kartheik
AU - Gawiser, Eric
AU - Davé, Romeel
AU - Davis, Philip
AU - Finkelstein, Steven L.
AU - Kodra, Dritan
AU - Koekemoer, Anton M.
AU - Kurczynski, Peter
AU - Newman, Jeffery A.
AU - Pacifici, Camilla
AU - Somerville, Rachel S.
N1 - Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
PY - 2018/10/20
Y1 - 2018/10/20
N2 - To achieve a fuller understanding of galaxy evolution, SED fitting can be used to recover quantities beyond stellar masses (M ∗) and star formation rates (SFRs). We use star formation histories (SFHs) reconstructed via the Dense Basis method of Iyer & Gawiser for a sample of 17,873 galaxies at 0.5 < z < 6 in the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey GOODS-S field to study the nature and evolution of the SFR-M ∗ correlation. The reconstructed SFHs represent trajectories in SFR-M ∗ space, enabling us to study galaxies at epochs earlier than observed by propagating them backward in time along these trajectories. We study the SFR-M ∗ correlation at z = 1, 2, 3, 4, 5, 6 using both direct fits to galaxies observed at those epochs and SFR-M ∗ trajectories of galaxies observed at lower redshifts. The SFR-M ∗ correlations obtained using the two approaches are found to be consistent with each other through a K-S test. Validation tests using SFHs from semi-analytic models and cosmological hydrodynamical simulations confirm the sensitivity of the method to changes in the slope, normalization, and shape of the SFR-M ∗ correlation. This technique allows us to further probe the low-mass regime of the correlation at high z by ∼1 dex and over an effective volume of ∼10×larger than possible with just direct fits. We find that the SFR-M ∗ correlation is consistent with being linear down to M ∗ ∼ 106 M o at z > 4. The evolution of the correlation is well described by , where t univ is the age of the universe in Gyr.
AB - To achieve a fuller understanding of galaxy evolution, SED fitting can be used to recover quantities beyond stellar masses (M ∗) and star formation rates (SFRs). We use star formation histories (SFHs) reconstructed via the Dense Basis method of Iyer & Gawiser for a sample of 17,873 galaxies at 0.5 < z < 6 in the Cosmic Assembly Near-Infrared Deep Extragalactic Legacy Survey GOODS-S field to study the nature and evolution of the SFR-M ∗ correlation. The reconstructed SFHs represent trajectories in SFR-M ∗ space, enabling us to study galaxies at epochs earlier than observed by propagating them backward in time along these trajectories. We study the SFR-M ∗ correlation at z = 1, 2, 3, 4, 5, 6 using both direct fits to galaxies observed at those epochs and SFR-M ∗ trajectories of galaxies observed at lower redshifts. The SFR-M ∗ correlations obtained using the two approaches are found to be consistent with each other through a K-S test. Validation tests using SFHs from semi-analytic models and cosmological hydrodynamical simulations confirm the sensitivity of the method to changes in the slope, normalization, and shape of the SFR-M ∗ correlation. This technique allows us to further probe the low-mass regime of the correlation at high z by ∼1 dex and over an effective volume of ∼10×larger than possible with just direct fits. We find that the SFR-M ∗ correlation is consistent with being linear down to M ∗ ∼ 106 M o at z > 4. The evolution of the correlation is well described by , where t univ is the age of the universe in Gyr.
KW - galaxies: evolution
KW - galaxies: star formation
KW - techniques: photometric
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U2 - 10.3847/1538-4357/aae0fa
DO - 10.3847/1538-4357/aae0fa
M3 - Article
AN - SCOPUS:85055489703
SN - 0004-637X
VL - 866
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 120
ER -