Gas kinematics and morphology of low-mass galaxies Kareem El-Badry - - PowerPoint PPT Presentation

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gas kinematics and morphology of low mass galaxies
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Gas kinematics and morphology of low-mass galaxies Kareem El-Badry - - PowerPoint PPT Presentation

Aug 28, 2023 352 likes •707 views

Gas kinematics and morphology of low-mass galaxies Kareem El-Badry (UC Berkeley) Eliot Quataert, Andrew Wetzel, Dan Weisz, Phil Hopkins, Shea Garrison-Kimmel, TK Chan, Mike Boylan-Kolchin, Alex Fitts, ++ Feedback drives gas outflows, leads

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Gas kinematics and morphology

  • f low-mass galaxies

Kareem El-Badry (UC Berkeley)

Eliot Quataert, Andrew Wetzel, Dan Weisz, Phil Hopkins, Shea Garrison-Kimmel, TK Chan, Mike Boylan-Kolchin, Alex Fitts, ++

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Kareem El-Badry (UC Berkeley)

Feedback drives gas

  • utflows, leads to bursty SF

El-Badry+16

Mstar ~ 3e8 M⊙

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Kareem El-Badry (UC Berkeley)

Feedback drives gas

  • utflows, leads to bursty SF

Mstar ~ 3e8 M⊙

El-Badry+16

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Kareem El-Badry (UC Berkeley)

Mstar = 1067M

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Mstar = 1078M

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Mstar = 1089M

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Mstar = 10911M

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HI mock observations

all galaxies viewed “edge-on”

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Kareem El-Badry (UC Berkeley)

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Kareem El-Badry (UC Berkeley)

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Kareem El-Badry (UC Berkeley)

LITTLE THINGs; Oh+2015

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Kareem El-Badry (UC Berkeley)

LITTLE THINGs; Oh+2015

Selection function? Quantitative comparison is hard.

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Kareem El-Badry (UC Berkeley)

Unresolved HI

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Kareem El-Badry (UC Berkeley)

Unresolved HI

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Kareem El-Badry (UC Berkeley)

Unresolved HI

~50 kpc

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Kareem El-Badry (UC Berkeley)

Unresolved HI

~50 kpc flux density

available for ~50,000 galaxies; morphologically blind

velocity

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Kareem El-Badry (UC Berkeley)

Unresolved observations contain kinematic information

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Kareem El-Badry (UC Berkeley)

El-Badry+18

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Kareem El-Badry (UC Berkeley)

El-Badry+18

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Kareem El-Badry (UC Berkeley)

El-Badry+18

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Kareem El-Badry (UC Berkeley)

k=-0.5 k=-0.9 k=-1.4

El-Badry+18

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Kareem El-Badry (UC Berkeley)

HI line kurtosis is sensitive to V/σ

El-Badry+18

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Kareem El-Badry (UC Berkeley)

comparison to observations

El-Badry+18

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Kareem El-Badry (UC Berkeley)

El-Badry+18

agreement at MW-masses

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Kareem El-Badry (UC Berkeley)

El-Badry+18

  • verly dispersion-supported

at low/intermediate masses

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Kareem El-Badry (UC Berkeley)

El-Badry+18

  • verly dispersion-supported

at low/intermediate masses

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Kareem El-Badry (UC Berkeley)

El-Badry+18

  • verly dispersion-supported

at low/intermediate masses

Line shape problem

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Kareem El-Badry (UC Berkeley)

Non-cosmological simulations

  • Idealized setup: NFW halo + gas in

hydrostatic equilibrium

  • “normal” angular momentum; λ = 0.03
  • run for 10 Gyr with same physics as

cosmological sims.

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Kareem El-Badry (UC Berkeley)

green: T ~ 1e4 K purple: T < 1e3 K red: T > 1e5 K

Non-cosmological simulations

  • Disks form and

survive!

Mstar ~ 1e8 M⊙

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Kareem El-Badry (UC Berkeley)

FIRE NC

Non-cosmological sims: better agreement with observations

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Kareem El-Badry (UC Berkeley)

MW-mass galaxies accrete until z=0

gas accretion rate

Mstar ~107 M⊙ Mstar ~1010.5 M⊙

gas accretion rate

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Kareem El-Badry (UC Berkeley)

Dwarfs accrete mostly at early times

gas accretion rate

Mstar ~107 M⊙ Mstar ~1010.5 M⊙

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Kareem El-Badry (UC Berkeley)

Gas accreted late has higher angular momentum

see also Brook+11; Übler+14

gas accretion rate

log(jgas, accreted)

Mstar ~107 M⊙ Mstar ~1010.5 M⊙

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Kareem El-Badry (UC Berkeley)

Both galaxies have:

irregular disky

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Kareem El-Badry (UC Berkeley)

Both galaxies have:

irregular disky

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Kareem El-Badry (UC Berkeley)

Summary

  • FIRE cosmological simulations produce a diversity of

dwarf galaxy morphologies and kinematics.

  • On average, simulated galaxies are more dispersion

supported and less disky than observed.

  • Idealized non-cosmological simulations with the same

ingredients make diskier dwarfs on average.

  • In cosmological simulations, feedback & UV background

prevent dwarfs from accreting high-angular momentum gas at late times.

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Kurtosis is insensitivity to SNR

KE, Bradford, Geha+18 Kareem El-Badry

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KE, Bradford, Geha+18 Kareem El-Badry

Kurtosis is insensitivity to SNR …but sensitive to inclination.