CONSTRAINING THE LOW-MASS SLOPE OF THE STAR FORMATION SEQUENCE AT 0.5 < z < 2.5

We constrain the slope of the star formation rate (SFR; log Ψ) to stellar mass (log M ∗) relation down to log (M ∗/M⊙) = 8.4 (log (M ∗/M⊙) = 9.2) at z = 0.5 (z = 2.5) with a mass-complete sample of 39,106 star-forming galaxies selected from the 3D-HST photometric catalogs, using deep photometry in the CANDELS fields. For the first time, we find that the slope is dependent on stellar mass, such that it is steeper at low masses (log Ψlog M ∗) than at high masses (log Ψ(0.3-0.6)log M ∗). These steeper low-mass slopes are found for three different star formation indicators: the combination of the ultraviolet (UV) and infrared (IR), calibrated from a stacking analysis of Spitzer/MIPS 24 μm imaging; β-corrected UV…

• SA
  Science and Technology Facilities Council

  Awards: ST/I00162X/1, ST/F002300/1, ST/H008519/1, ST/I001166/1