Exploring Galaxy Formation and Assembly Histories with Globular - PowerPoint PPT Presentation

Exploring Galaxy Formation and Assembly Histories with Globular Cluster Populations Christopher Usher @doctor_chrusher

Formation redshift Formation redshift E-MOSAICS 0.0 0.1 0.2 0.4 0.6 1.0 2.0 3.0 6.0 0.0 0.1 0.2 0.4 0.6 1.0 2.0 3.0 6.0 -0.5 10 Strong -1.0 Metallicity [Fe/H] connection -1.5 between GC 8 -2.0 MW09 MW14 age-metallicity 10 5 < M/ M � < 10 6 . 1 10 5 < M/ M � < 10 6 . 2 -2.5 distribution and -0.5 galaxy formation 6 -1.0 Metallicity [Fe/H] and assembly R gc [kpc] -1.5 history -2.0 MW15 MW18 4 10 5 < M/ M � < 10 7 10 5 < M/ M � < 10 6 . 5 Diversity in age -2.5 -0.5 and metallicity distributions -1.0 Metallicity [Fe/H] 2 -1.5 Kruijssen et al. -2.0 MW19 MW23 (submitted, 10 5 < M/ M � < 10 6 . 1 10 5 < M/ M � < 10 7 . 4 -2.5 0 2018) 0.0 2.5 5.0 7.5 10.0 12.5 0.0 2.5 5.0 7.5 10.0 12.5 Age [Gyr] Age [Gyr]

25 Early-type galaxies 
 Old stellar populations, regular morphologies 9 to 27 Mpc away Absolute K-band magnitudes of − 22.4 to − 25.5 Brightest cluster galaxies to isolated lenticulars SLUGGS Brodie et al. (2014) sluggs.swin.edu.au

SLUGGS Keck DEIMOS spectroscopy of over 4000 GCs Calcium triplet based metallicities for 1309 GCs More measurements to come

Breaking the Age-Metallicirty Degeneracy Only photometry Photometry and metallicity FSPS v3.0 (Conroy+ 2009, 2010) with MIST isochrones (Choi+ 2016) SDSS gi with σ = 0.01 mag, σ [Z/H] = 0.1 dex, Uniform prior on age Usher et al. (in prep.)

SDSS 50 by 50 kpc Usher et al. (in prep.)