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

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Metallicity [Fe/H] MW09 105 < M/M < 106.1 0.0 0.1 0.2 0.4 0.6 1.0 2.0 3.0 6.0 Formation redshift MW14 105 < M/M < 106.2 0.0 0.1 0.2 0.4 0.6 1.0 2.0 3.0 6.0 Formation redshift

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Metallicity [Fe/H] MW15 105 < M/M < 107 MW18 105 < M/M < 106.5 0.0 2.5 5.0 7.5 10.0 12.5 Age [Gyr]

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Metallicity [Fe/H] MW19 105 < M/M < 106.1 0.0 2.5 5.0 7.5 10.0 12.5 Age [Gyr] MW23 105 < M/M < 107.4 2 4 6 8 10 Rgc [kpc]

Strong connection between GC age-metallicity distribution and galaxy formation and assembly history Diversity in age and metallicity distributions Kruijssen et al. (submitted, 2018)

E-MOSAICS

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

Keck DEIMOS spectroscopy of

• ver 4000 GCs

Calcium triplet based metallicities for 1309 GCs More measurements to come

SLUGGS

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

Breaking the Age-Metallicirty Degeneracy

Only photometry Photometry and metallicity

Usher et al. (in prep.)

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