Diffuse Stellar Component in State-of-the-art Cosmological - PowerPoint PPT Presentation

Diffuse Stellar Component in State-of-the-art Cosmological Hydrodynamical Simulations Stellar Halos 2018 Rodrigo Cañas rodrigo.canas@icrar.org Claudia Lagos Chris Power Pascal Elahi Charlotte Welker

What do we mean by diffuse? Stellar material that surrounds galaxies Intra-Halo Stellar ● Stellar Haloes Component ● Intra-Group Light (IHSC) ● Intra-Cluster Light scale independent! 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 2

Motivation - at MW masses Merritt et al., 2016 Diffuse Fraction Stellar Mass 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 3

Motivation - Intra-Cluster Light Morishita et al., 2017 ` Cluster MACS0416 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 4

From MW to ICL - observations . 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 5

How IHSC is measured in simulations? Multiple approaches N-body simuations “Idealized” simulations ● (Bullock & Johnston 2005) SAMs (Contini+2014) ● SAMs + Particle tagging ● (Cooper+2010, 2013, 2015, 2017) Accreted mass ● Bullock & Johnston (2005) Cooper et al. (2010) 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 6

How IHSC is measured in simulations? Multiple approaches Hydro-sims In-situ vs Ex-situ ● Follow satellites (e.g. Ana-Roxana’s talk) - Sharp cuts ● Fixed spherical appertures ● X kpc Monachesi+2018 Auriga - N -times effective or half mass radius - This could introduce biases due to mass ● distribution of disks and spheroids Does the galaxy ends/IHSC starts for all ● galaxies at X kpc? Satellite particles never become part of the ● central? Huang et al (in preparation) Alexie’s talk 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 7

From MW to ICL - simulations 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 8

How IHSC is measured in simulations? Our approach ``Equivalent’’ approach as observations Galaxies are modeled/identified and diffuse ● component is separated Robustly 1) Identify Galaxies 2) Separate IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 9

Robust identification of galaxies SUBFIND Source: Illustris Project Common galaxy finding problems Strongly interacting galaxies ● Densely populated systems ● (Groups and Clusters) Delimitation of galaxies ● Group Central Galaxy Particle assignment to density peaks ● Identification of galaxies is different from dark matter haloes ● Same algorithms and assumptions for dark matter haloes are used for ● galaxy identification SUBFIND Poole et al., 2017 GiggleZ-HR simulation 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 10

How do we solve this? Elahi et al., 2011 VELOCIraptor Elahi et al., in prep FOF algorithm in 6D to find structures in simulations ● Haloes ● Streams ● Shells Modifications and improvements to robustly find galaxies in hydrodynamical simulations Cañas et al. (arXiv:1806.11417) 3D-FOF 6D-FOF 6D-FOF Iterative Phase-Space Field Search Field Search Core Search Core Growth 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 11

Improvements of algorithm Galaxy Cluster HaloMaker VELOCIraptor A v o i d i n c l u d i n g o t h e r g a l a x i e s ’ s t a r s C1 S m o o t h p r o f i l e s ! C2 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 12

We get tidal features for free! We can study the evolution of the whole satellite population as they go from Satelitte → satellite + Tidal → Tidal → IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 13

Robust Identification of Galaxies Galaxy Cluster HaloMaker VELOCIraptor Summary 1 Important to solve these ● problems before analysis Density profiles / stellar ● population properties profiles can be affected 3D and 2D! This features in IllustrisTNG Patrick Ondratschek’s In principle we could use ● poster identified streams to trace complete evolution from satellite to tidal feature to IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 14

Intra-Halo Stellar Component 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 15

What does it look like? 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 16

What does it look like? 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 17

Follow the evolution of IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 18

Follow the evolution of IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 19

Follow the evolution of IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 20

Follow the evolution of IHSC 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 21

Follow the evolution of IHSC z 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 22

Individual system paths 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 23

Individual system paths 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 24

Individual system paths 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 25

Individual system paths 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 26

Individual system paths 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 27

Individual system paths 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 28

How about other simulations? Coming on December 7th…… IllustrisTNG 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 29

How about other simulations? Compare different codes and different galaxy formation models Lets not forget Crain+2015 galaxy mass function can be reproduced by different prespcriptions with the right tunning 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 30

How about other simulations? Poor statistics Coming on December 7th…… IllustrisTNG 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 31

How about other simulations? The 300 300 Galaxy Clusters from MultiDark Simulation Klypin et al., 2016 Full physics re-simulations 4 codes - 2 Gadget Credit: Alexander Knebe Mock Perth - 2 Gizmo 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 32

How about other simulations? Coming on December 7th…… IllustrisT 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 33

From MW to ICL - our results 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 34

From MW to ICL - final comments Resolve IHSC ● EAGLE boxes ● Higher resolution simulations ● IllustrisTNG-50 ? Statistics ● 300 Project ● IllustrigTNG-300 ● C-EAGLE ● EAGLE-XL Resolution dependence, Convergence, Smoothness of IHSC ● EAGLE boxes ● Illustris (same IC different resolution) ● 300 Project (same IC different resolutions and codes) ● IllustrisTNG ? 05 - 07 - 2018 Rodrigo Cañas Stellar Halos 2018 Heidelberg, Germany 35