with SDSS-IV/MaNGA 10,000 of these Daniel Thomas University of - - PowerPoint PPT Presentation

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with SDSS-IV/MaNGA 10,000 of these Daniel Thomas University of - - PowerPoint PPT Presentation

Oct 24, 2022 706 likes •908 views

Stellar populations in galaxy haloes with SDSS-IV/MaNGA 10,000 of these Daniel Thomas University of Portsmouth Daniel Goddard, Taniya Parikh, Jianhui Lian Daniel Thomas - Galaxy haloes with MaNGA Stellar halos across the cosmos - Heidelberg -

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Stellar populations in galaxy haloes with SDSS-IV/MaNGA

Daniel Thomas

University of Portsmouth Daniel Goddard, Taniya Parikh, Jianhui Lian 10,000 of these

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Signatures of accretion

Illustris simulations Transition radius to halo defined in simulations Link between metallicity gradient and ex-situ fraction Transition radius from Planetary Nebulae as low as 1 Re (Pulsoni et al 2018).

Cook et al 2016 Rodriguez-Gomez et al 2016

  • =

+ S

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R

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R R

=

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S R

R R R

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Metallicity gradients in transition

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R

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Illustris simulations Transition radius to halo defined in simulations Link between metallicity gradient and ex-situ fraction

Cook et al 2016

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

MaNGA

s s =

  • +
  • Bundy et al 2015; Drory et al 2015; Law et al 2016;

Yan et al 2016; Wake et al 2017

Mapping Galaxies at APO

SDSS-IV collaboration, 2014-2020, PI Kevin Bundy 10,000 galaxies, mass-selected above 109 Msun, z=0.005-0.15 (30ₒATLAS3D)

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Full Spectral Fitting Code FIREFLY

Gives an array of fits, each as a combination of single-burst modes (SSPs), to get SFH, metallicity, age distribution, etc.

Fast computation of likelihood surfaces of properties Ability to change and compare input stellar population model ingredients Reconstructs SFHs from combinations of bursts

SP models of Maraston & Strömbäck 2011

Wilkinson et al 2015, 2017; Goddard et al 2017b

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Maps of stellar population parameters

Goddard et al 2017b age metallicity dust

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Metallicity gradients with MaNGA

stars gas

Lian et al 2018b

Stacked maps of 3,000 MaNGA galaxies

low mass high mass

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Gas vs stars and IMF

Jianhui Lian Lian et al 2018a,b Taniya Parikh Parikh et al 2018

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Gas vs stars and IMF

Jianhui Lian Lian et al 2018a,b Taniya Parikh Parikh et al 2018

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Stellar population gradients

Goddard et al 2017b age metallicity

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Z-gradient steepens with galaxy mass

Goddard et al 2017a,b

Negative metallicity gradient steepens with increasing galaxy mass This trend is stronger in late-type galaxies Dip seen at intermediate galaxy masses likely caused by transition from late to early type

late-type early-type

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Metallicity gradients in transition

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R

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R

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Update with MaNGA: Steepest gradient at transition between late and early type Stellar halo characterised by flat gradient

Cook et al 2016

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Pushing MaNGA beyond 1.5 Re

Secondary sample covering 2.5 Re Stack edge-on galaxies along minor axis

Jones et al 2017

Secondary MaNGA

2,000 of these

Coma cluster deep observations (Meng Gu)

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Spectroscopy far out

Low surface brightness makes spectroscopy hard Stellar populations old, alpha-enhanced and metal-rich

Coccato et al 2011 NGC 6166 NGC 3311 Bender et al 2015

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

MaNGA gradients out to 2.5 Re

Steep negative metallicity flattens at large r along major axis Common metallicity around [Z/H]=-0.2 in stellar halo independent

  • f galaxy mass

inner galaxy

  • uter galaxy

stellar halo Credit: Jianhui Lian

Combining 17,000 late-type galaxies

109.5 1010 1010.5 1011 Msun

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

MaNGA gradients out to 2.5 Re

Steep negative metallicity flattens at large r along major axis Common metallicity around [Z/H]=-0.2 in stellar halo independent

  • f galaxy mass

inner galaxy

  • uter galaxy

stellar halo Credit: Jianhui Lian

Combining 17,000 late-type galaxies

109.5 1010 1010.5 1011 Msun

s s s s s s s s s s s

= + s s

s s s s s s s s s s s

= + s s

Greene et al 2015

s s s s s s s s s s s

= + s s

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Stellar halo Z with Planetary Nebulae

Mendez et al 2005

NGC 4679 Combine stellar light measurements with Planetary Nebula metallicities to reach stellar halo Flat Z gradient (but large scatter)

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Metallicity gradients in transition

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R

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R

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R

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Update with MaNGA: Steepest gradient at transition between late and early type Stellar halo characterised by flat gradient

Cook et al 2016

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Stellar halos across the cosmos - Heidelberg - July 2018 Daniel Thomas - Galaxy haloes with MaNGA

Table talk

Ex-situ vs in-situ Metallicity gradients in stellar halo Strong dependence on ex-situ fraction MaNGA IFU spectroscopic survey of 10k nearby galaxies Metallicity gradients steepen with increasing galaxy mass Dependence on galaxy type -> minimum at intermediate mass MaNGA reaching into the stellar halo Secondary sample allows wider coverage out to 2.5 Re Metallicity gradient flat in outer galaxy/stellar halo Metallicity converges to [Z/H] = -0.2 independent of galaxy mass Consistent with abundances from Planetary Nebulae

inner

  • uter

halo