The Bimodal Formation Time Distribution of Infall Dark Matter Halos - - PowerPoint PPT Presentation

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The Bimodal Formation Time Distribution of Infall Dark Matter Halos - - PowerPoint PPT Presentation

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The Bimodal Formation Time Distribution of Infall Dark Matter Halos and Its Effect on Galaxies Jingjing Shi KIAA, Peking University In collaboration with: Huiyuan Wang (USTC), Houjun Mo (UMass & THU), Lizhi Xie (TJNU), Ravi K.

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July 2-6, ICTP Jingjing Shi, KIAA, PKU

The Bimodal Formation Time Distribution of Infall Dark Matter Halos and Its Effect on Galaxies

Jingjing Shi 史晶晶 KIAA, Peking University

In collaboration with: Huiyuan Wang (USTC), Houjun Mo (UMass & THU), Lizhi Xie (TJNU), Ravi K. Sheth (UPenn), Xiaoyu Wang (USTC), Andrea Lapi (SISSA)

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Motivation

Lacey & Cole 1993 Sheth 2003

Main Trunk Infall Halos

Subclump mass: Parent mass:

Formation time distribution of subhalos:

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SLIDE 3

Motivation

Wetzel et. al. 2013 Lacey & Cole 1993

Main Trunk Infall Halos Satellite Quenching:

  • A. Does subhalo share a similar accretion history as the host halo?
  • B. What is the pre-accretion phase of subhalo looks like? and How is it

related with the galaxy properties lying inside?

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July 2-6, ICTP Jingjing Shi, KIAA, PKU

Merger trees and simulations:

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SLIDE 5

The bimodal formation time distribution of infall DM halos

1 2 3 4 anf 1 2 3 4 5 6 7 P(anf) 1011 < M0 < 6 ⇤ 1014M/h

7 < zpeak < 7.5 5 < zpeak < 5.5 3 < zpeak < 3.5 2 < zpeak < 2.5 1.4 < zpeak < 1.5 0.9 < zpeak < 1 0.4 < zpeak < 0.5 0 < zpeak < 0.1

0.0 0.5 1.0 1.5 2.0 1.4 < zpeak < 1.5

1011 < M0 < 1011.5 1012 < M0 < 1012.5 1013 < M0 < 1013.5 1014 < M0 < 1014.5

1.0 1.5 2.0 2.5 anf 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1.4 < zpeak < 1.5

1010 < Mpeak < 1010.5 1010.5 < Mpeak < 1011 1011 < Mpeak < 1011.5 1011.5 < Mpeak < 1012

Young

  • ld

Shi et al. (2018)

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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SLIDE 6

Shi et al. (2018)

1 2 3 4 anf 1 2 3 4 5 6 7 P(anf) Survivors 1 2 3 4 anf First-order halos

7 < zpeak < 7.5 5 < zpeak < 5.5 3 < zpeak < 3.5 2 < zpeak < 2.5 1.4 < zpeak < 1.5 0.9 < zpeak < 1 0.4 < zpeak < 0.5 0 < zpeak < 0.1

Survivors and First-order accreted halos

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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SLIDE 7

Shi et al. (2018) 1 2 3 4 anf 1 2 3 4 5 6 7 P(anf) 1011 < M0 < 6 ⇤ 1014M/h wavering population

7 < zpeak < 7.5 5 < zpeak < 5.5 3 < zpeak < 3.5 2 < zpeak < 2.5 1.4 < zpeak < 1.5 0.9 < zpeak < 1 0.4 < zpeak < 0.5 0 < zpeak < 0.1

0.0 0.5 1.0 1.5 2.0 1.4 < zpeak < 1.5

1011 < M0 < 1011.5 1012 < M0 < 1012.5 1013 < M0 < 1013.5 1014 < M0 < 1014.5

1.0 1.5 2.0 2.5 anf 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1.4 < zpeak < 1.5

1010 < Mpeak < 1010.5 1010.5 < Mpeak < 1011 1011 < Mpeak < 1011.5 1011.5 < Mpeak < 1012

Wavering population

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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SLIDE 8

Shi et al. (2018)

1 2 3 4 (1 + z)/(1 + zpeak) 10−1 100 Mvir(z)/Mvir(zpeak) Mpeak : 1011 − 1011.5, anf < 1.3 1 2 3 4 (1 + z)/(1 + zpeak) 10−1 100 Mvir(z)/Mvir(zpeak) Mpeak : 1011 − 1011.5, anf > 1.5

Young

  • ld

July 2-6, ICTP Jingjing Shi, KIAA, PKU

Mass accretion history

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Turning Point Fast Accretion

Zhao et al. (2003)

0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 log xx = log[H2(zf)/H2(zpeak)] 1 2 3 4 5 6 P(log xx) 1011 < M0 < 6 ⇤ 1014M/h 0.1 0.2 0.3 1 2 3 4 5 6

Slow Accretion Fast Accretion

Shi et al. (2018)

Slow Accretion

July 2-6, ICTP Jingjing Shi, KIAA, PKU

Two-Phase Mass accretion history

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SLIDE 10

0.0 0.5 P(anf)

zpeak = 0.2 = z

0.0 0.5 1.0 1.5

[1011, 1011.5] zpeak = 1 = z

0.0 0.5 1.0 1.5 2.0 2.5

zpeak = 2 = z

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

zpeak = 3 = z

Whole Main Halos Infall Halos

1.2 1.8 2.4 3.0 3.6 anf 0.0 0.5 P(anf)

zpeak = 0.2 = z

1.2 1.6 2.0 2.4 anf 0.0 0.5 1.0 1.5 2.0 2.5

[1012, 1013] zpeak = 1 = z

1.2 1.6 2.0 anf 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

zpeak = 2 = z

1.2 1.6 anf 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

zpeak = 3 = z

Shi et al. (2018)

July 2-6, ICTP Jingjing Shi, KIAA, PKU

Infall halos versus Normal halos

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SLIDE 11

Shi et al. (2018) 1 2 3 4 anf 1 2 3 4 5 6 7 P(anf)

  • 7. < zpeak < 8.5.

5 < zpeak < 5.5 3 < zpeak < 3.5 2 < zpeak < 2.5

  • 1. < zpeak < 1.2

0.8 < zpeak < 1 0.4 < zpeak < 0.6 0 < zpeak < 0.2

0.0 0.5 1.0 1.5 1.2 < zpeak < 1.5

M0 = 1011.25 M0 = 1012.25 M0 = 1013.25 M0 = 1014.25

1.0 1.5 2.0 2.5 anf 1 2 1.2 < zpeak < 1.5

1010 < Mpeak < 1010.5 1010.5 < Mpeak < 1011 1011 < Mpeak < 1011.5 1011.5 < Mpeak < 1012

July 2-6, ICTP Jingjing Shi, KIAA, PKU

EPS merger tree results

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Bray et al. (2016)

July 2-6, ICTP Jingjing Shi, KIAA, PKU

Connection between halo age and galaxy color

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Nelson et al. (2015)

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Shi et al. (2018), in preparation

Stellar mass at accretion time and z=0

0.0 0.1 0.2 0.3 0.4 0.5 log (1 + zpeak) 3.0 2.5 2.0 1.5 log M?,peak,0/Mpeak M?,0 > 108M/h Slow: anf > 1.5 Fast: anf < 1.3 1010.9 < Mpeak < 1011.5 0.0 0.1 0.2 0.3 0.4 0.5 log (1 + zpeak) 3.0 2.5 2.0 1.5 1011.5 < Mpeak < 1012.1

z = zpeak z = 0 z = zpeak z = 0

Accretion redshift Stellar mass/halo mass at accretion z_peak z=0 Fast Slow

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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Shi et al. (2018), in preparation

Stellar mass evolution

Redshift Stellar mass(z)/stellar mass at accretion

0.2 0.0 0.2 0.4 0.6 log (1 + z)/(1 + zpeak) 4 3 2 1 log m?(z)/m?,peak 1010.9 < Mpeak < 1011.5

0.2 < zpeak < 0.6, Slow 0.2 < zpeak < 0.6, Fast 1 < zpeak < 1.5, Slow 1 < zpeak < 1.5, Fast

0.4 0.2 0.0 0.2 0.4 0.6 0.8 log (1 + z)/(1 + zpeak) M?,0 > 108M/h 1011.5 < Mpeak < 1012.1

Fast Slow

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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Shi et al. (2018), in preparation

0.0 0.1 0.2 0.3 0.4 0.5 log (1 + zpeak) 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 log Mgas,peak,0/Mpeak Slow: anf > 1.5 Fast: anf < 1.3 1010.9 < Mpeak < 1011.5 0.0 0.1 0.2 0.3 0.4 0.5 log (1 + zpeak) 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 M?,0 > 108M/h 1011.5 < Mpeak < 1012.1

z = zpeak z = 0 z = zpeak z = 0

Gas mass at accretion time and z=0

Accretion redshift Gas mass/halo mass at accretion z_peak z=0 Fast Slow

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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SLIDE 17

Shi et al. (2018), in preparation

Gas mass evolution

Redshift Gas mass(z)/gas mass at accretion

0.2 0.0 0.2 0.4 0.6 log (1 + z)/(1 + zpeak) 2.5 2.0 1.5 1.0 0.5 0.0 0.5 log mgas(z)/mgas,peak M?,0 > 108M/h 1010.9 < Mpeak < 1011.5 0.4 0.2 0.0 0.2 0.4 0.6 0.8 log (1 + z)/(1 + zpeak) 1011.5 < Mpeak < 1012.1

0.2 < zpeak < 0.6, Slow 0.2 < zpeak < 0.6, Fast 1 < zpeak < 1.5, Slow 1 < zpeak < 1.5, Fast

Fast Slow

July 2-6, ICTP Jingjing Shi, KIAA, PKU

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Summary

✤ At given accretion time, the formation time distribution of infall halos is bimodal ✤ Comparing to the normal halos, the infall halos are younger ✤ The stellar mass, gas mass is higher for the satellite galaxies lying in the slow

accretion phase halo than those lying in the fast accretion phase halo at accretion time

✤ At z=0, the stellar mass of the satellites in the slow accretion phase halo is higher,

however their gas mass is lower

✤ The stellar mass continues to grow even after accretion happens; the satellites in the

fast accretion phase halo even continues the gas accretion

✤ Our work can help to better constrain the satellite quenching process and the galaxy-

halo connection