Clumpy galaxies at high redshift: Insights from the NIHAO - - PowerPoint PPT Presentation

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Clumpy galaxies at high redshift: Insights from the NIHAO - - PowerPoint PPT Presentation

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Clumpy galaxies at high redshift: Insights from the NIHAO simulations Buck et al. 2017 (MNRAS) - arXiv:1612.05277 Gas in Galaxies Valetta 6th of October Tobias Buck Andrea V. Macci, Aura Obreja, Aaron A. Dutton, Hans-Walter Rix PhD student

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Clumpy galaxies at high redshift: Insights from the NIHAO simulations

Andrea V. Macciò, Aura Obreja, Aaron A. Dutton, Hans-Walter Rix

Tobias Buck

Gas in Galaxies Valetta 6th of October

Buck et al. 2017 (MNRAS) - arXiv:1612.05277

PhD student at MPIA

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Tobias Buck 06.10.17 Gas in Galaxies, Valetta 2

  • star forming disc galaxies at redshift 0.5 - 3
  • observed to have UV-bright / H-alpha-bright clumps
  • clump sizes ~1 kpc, clump masses 1e8 - 1e10 Msun

Intro: What are clumpy galaxies?

simulation

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Tobias Buck 06.10.17 3

Intro: Clumpy galaxies in observations

Gas in Galaxies, Valetta

Guo+2015 Elmegree+2013 Wuyts+2012

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Tobias Buck 06.10.17 4

Why are clumpy galaxies interesting previous works/simulations

simulation

  • clump formation via Violent Disc Instability (Dekel+2009)
  • color gradient: clump inspiral

Genzel+2006,2009, Förster-Schreiber+2006,2011, Wuyts+2012, Elmegreen+2013, Tadaki+2014, Murata+2014, Guo+2015, Shibuya+2016

Obs.: Theory: Bournaud+2007,2008,2009,2014, Dekel+2009, Ceverino+2010,2012, Mandelker+2014, Moody+2014, Tamburello+2015,

Mayer+2016, Oklopcic+2017

Gas in Galaxies, Valetta

Bournaud+2014 540 Myr 760 Myr

Gas surface density

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Tobias Buck 06.10.17 4

Why are clumpy galaxies interesting previous works/simulations

simulation

  • clump formation via Violent Disc Instability (Dekel+2009)
  • color gradient: clump inspiral

Genzel+2006,2009, Förster-Schreiber+2006,2011, Wuyts+2012, Elmegreen+2013, Tadaki+2014, Murata+2014, Guo+2015, Shibuya+2016

Obs.: Theory: Bournaud+2007,2008,2009,2014, Dekel+2009, Ceverino+2010,2012, Mandelker+2014, Moody+2014, Tamburello+2015,

Mayer+2016, Oklopcic+2017

Gas in Galaxies, Valetta

Bournaud+2014 540 Myr 760 Myr

Gas surface density

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Tobias Buck 06.10.17 4

Why are clumpy galaxies interesting previous works/simulations

simulation

  • clump formation via Violent Disc Instability (Dekel+2009)
  • color gradient: clump inspiral

Genzel+2006,2009, Förster-Schreiber+2006,2011, Wuyts+2012, Elmegreen+2013, Tadaki+2014, Murata+2014, Guo+2015, Shibuya+2016

Obs.: Theory: Bournaud+2007,2008,2009,2014, Dekel+2009, Ceverino+2010,2012, Mandelker+2014, Moody+2014, Tamburello+2015,

Mayer+2016, Oklopcic+2017

Gas in Galaxies, Valetta

Bournaud+2014 540 Myr 760 Myr

Gas surface density

Mass [M ]

4kpc

z=2.03, t=22Myr z=2.021, t=37Myr z=2.012, t=52Myr

winds

Genel+2012

Gas surface density

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Tobias Buck 06.10.17 5

Observed vs. simulated clumps: some tension…

simulation

Gas in Galaxies, Valetta

simulations disagree on fate of clumps simulations and observations probe different things

  • observations: clumps in stellar light
  • most theory: clumps in gas density

Guo+2015

=

Bournaud+2014

light gas

?

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Tobias Buck 06.10.17

The NIHAO Simulation suite

90 zoom-in simulations from Milky-Way mass to dwarf galaxies scales

6 g8.26e11 Gas in Galaxies, Valetta

NIHAO I: Wang+15

(82 galaxies in this plots)

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Tobias Buck 06.10.17

The NIHAO Simulation suite

90 zoom-in simulations from Milky-Way mass to dwarf galaxies scales

6 g8.26e11 Gas in Galaxies, Valetta

NIHAO I: Wang+15

(82 galaxies in this plots)

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Tobias Buck 06.10.17 7 Gas in Galaxies, Valetta

„intrinsic“

The post processing of NIHAO

19 high mass galaxies from the NIHAO sample M_star > 1e9 M_sun at redshift z=1.5 Selection of clumps in light

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Tobias Buck 06.10.17 7

  • A. intrinsic luminosity calculated from simple stellar populations

Gas in Galaxies, Valetta

„intrinsic“

The post processing of NIHAO

19 high mass galaxies from the NIHAO sample M_star > 1e9 M_sun at redshift z=1.5 Selection of clumps in light „intrinsic“

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Tobias Buck 06.10.17 7

  • A. intrinsic luminosity calculated from simple stellar populations

Gas in Galaxies, Valetta

„intrinsic“ „observed“

The post processing of NIHAO

19 high mass galaxies from the NIHAO sample M_star > 1e9 M_sun at redshift z=1.5 Selection of clumps in light

(Domìnguez-Tenreiro+2014)

  • B. radiative transfer post processing with GRASIL-3D

„intrinsic“

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Tobias Buck 06.10.17 8

The „observed“ clumpy fraction of NIHAO

Gas in Galaxies, Valetta

Fraction of galaxies with clumps

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Tobias Buck 06.10.17 9 Gas in Galaxies, Valetta

The „observed“ clumpy fraction of NIHAO

Fraction of galaxies with clumps

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Tobias Buck 06.10.17 9 Gas in Galaxies, Valetta

The „observed“ clumpy fraction of NIHAO

Fraction of galaxies with clumps

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Tobias Buck 06.10.17 9 Gas in Galaxies, Valetta

The „observed“ clumpy fraction of NIHAO

Fraction of galaxies with clumps

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Tobias Buck 06.10.17

U-Band SFR Gas Stars

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The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

U-Band

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Tobias Buck 06.10.17

U-Band SFR Gas Stars

10

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

U-Band

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Tobias Buck 06.10.17

U-Band SFR Gas Stars

10

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

U-Band

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Tobias Buck 06.10.17

U-Band SFR Gas Stars

10

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

U-Band

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Tobias Buck 06.10.17

U-Band SFR Gas Stars

10

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

U-Band

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Tobias Buck 06.10.17

Number of clumps per snapshot Number of clumps per snapshot

11

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

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Tobias Buck 06.10.17

Number of clumps per snapshot

11

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

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Tobias Buck 06.10.17

Number of clumps per snapshot

11

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

NO clumps in stars

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Tobias Buck 06.10.17 12

Stellar mass maps of observations

Gas in Galaxies, Valetta

NB209-7 V606 I NB209-12 V606 I

Wuyts+2012

M * M *

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Tobias Buck 06.10.17 12

Stellar mass maps of observations

Gas in Galaxies, Valetta

NB209-7 V606 I NB209-12 V606 I

Wuyts+2012

M * M *

RGB U-Band stellar mass

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Tobias Buck 06.10.17

Conclusions

Clumpy galaxies in NIHAO:

  • agree well with observed relations
  • are ONLY present in stellar light
  • can NOT be found in stellar mass
  • are not long lived and do not contribute to

bulge growth

13 Gas in Galaxies, Valetta

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Tobias Buck 06.10.17

Conclusions

Clumpy galaxies in NIHAO:

  • agree well with observed relations
  • are ONLY present in stellar light
  • can NOT be found in stellar mass
  • are not long lived and do not contribute to

bulge growth

13 Gas in Galaxies, Valetta

TB+2017 U-Luminosity RGB composite

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Extra Material

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14

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The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

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Tobias Buck 06.10.17 16

The „intrinsic“ clumps of NIHAO

Gas in Galaxies, Valetta

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Tobias Buck 06.10.17 MPIA Galaxy Coffee 17

Differences to other Simulations

0.0 0.2 0.4 M [M 0.0 0.2 0.4 103 109 1010 1011 1012 103 102 101 z=2

FIRE MIRAGE VELA VELA Inoue15 VELA RP NIHAO

10 M?/M200 0.4 M200 [M] 10 10

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Tobias Buck 06.10.17 MPIA Galaxy Coffee 17

Differences to other Simulations

  • Rad. Press.

no Rad Press.

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Tobias Buck 06.10.17 MPIA Galaxy Coffee 17

Differences to other Simulations

  • Rad. Press.

no Rad Press.

Feedback prescription is crucial for clump formation/survival

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Tobias Buck 06.10.17 18

The fate of „intrinsic“ clumps in NIHAO

Gas in Galaxies, Valetta

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Tobias Buck 06.10.17 19

The „observed“ clumpy fraction of NIHAO - correlation with galaxy property

Gas in Galaxies, Valetta

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Tobias Buck 06.10.17 19

The „observed“ clumpy fraction of NIHAO - correlation with galaxy property

Gas in Galaxies, Valetta

„compactness“

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Tobias Buck 06.10.17 20

The „observed“ clump properties of NIHAO

Gas in Galaxies, Valetta

1.0 1.5 2.0 10−1

F¨

  • rster-Schreiber+2011

NIHAO

fractional UV light contribution

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Tobias Buck 06.10.17 21

The Gas fraction of NIHAO

Gas in Galaxies, Valetta

109 1010 1011 M? [M] 0.0 0.2 0.4 0.6 0.8 1.0 fgas =Mgas/(Mgas+M?) z=0

NIHAO z=0 MIRAGE z=0 (Dutton+11)

109 1010 1011 M? [M] z=1

NIHAO z=1 VELA MIRAGE FIRE m13 PHIBSS corr PHIBBS