| Autor: |
Emily Quinn Finney, Maruša Bradač, Kuang-Han Huang, Austin Hoag, Takahiro Morishita, Tim Schrabback, Tommaso Treu, Kasper Borello Schmidt, Brian C. Lemaux, Xin Wang, Charlotte Mason |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 5/20/2018, Vol. 859 Issue 1, p1-1, 1p |
| Abstrakt: |
We present a gravitational-lensing model of MACS J1149.5+2223 using ultra-deep Hubble Frontier Fields imaging data and spectroscopic redshifts from HST grism and Very Large Telescope (VLT)/MUSE spectroscopic data. We create total mass maps using 38 multiple images (13 sources) and 608 weak-lensing galaxies, as well as 100 multiple images of 31 star-forming regions in the galaxy that hosts supernova Refsdal. We find good agreement with a range of recent models within the HST field of view. We present a map of the ratio of projected stellar mass to total mass (f⋆) and find that the stellar mass fraction for this cluster peaks on the primary BCG. Averaging within a radius of 0.3 Mpc, we obtain a value of , consistent with other recent results for this ratio in cluster environments, though with a large global error (up to δf⋆ = 0.005) primarily due to the choice of IMF. We compare values of f⋆ and measures of star formation efficiency for this cluster to other Hubble Frontier Fields clusters studied in the literature, finding that MACS1149 has a higher stellar mass fraction than these other clusters but a star formation efficiency typical of massive clusters. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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