2014/07/31 by I. Martín-Navarro, Ignacio Martín-Navarro, P. G. Pérez-González +27
Physics and Astronomy · #Astronomy and Astrophysical Research #Function (biology) #Galaxies: Formation, Evolution, Phenomena #Initial mass function #Luminosity #Stellar evolution #Stellar mass #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1088/2041-8205/798/1/l4
6 pages, 5 figures, accepted for publication in ApJL
arxiv created 2014/11/24 · openalex publication_date 2014/12/12 · arxiv updated 2014/12/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We explore the stellar initial mass function (IMF) of a sample of 49 massive quiescent galaxies (MQGs) at 0.9 < z < 1.5. We base our analysis on intermediate resolution spectro-photometric data in the GOODS-N field taken in the near-infrared and optical with the Hubble Space Telescope Wide Field Camera 3 G141 grism and the Survey for High- z Absorption Red and Dead Sources. To constrain the slope of the IMF, we have measured the TiO 2 spectral feature, whose strength depends strongly on the content of low-mass stars, as well as on stellar age. Using ultraviolet to near-infrared individual and stacked spectral energy distributions, we have independently estimated the stellar ages of our galaxies. Knowing the age of the stellar population, we interpret the strong differences in the TiO 2 feature as an IMF variation. In particular, for the heaviest z ∼ 1 MQGs ( M > 10 11 M ☉ ), we find an average age of 1.7 ± 0.3 Gyr and a bottom-heavy IMF (Γ b = 3.2 ± 0.2). Lighter MQGs (2 × 10 10 < M < 10 11 M ☉ ) at the same redshift are younger on average (1.0 ± 0.2 Gyr) and present a shallower IMF slope ( ). Our results are in good agreement with the findings about the IMF slope in early-type galaxies of similar mass in the present-day universe. This suggests that the IMF, a key characteristic of the stellar populations in galaxies, is bottom-heavier for more massive galaxies and has remained unchanged in the last ∼8 Gyr.