Quenching Timescales or, why the green valley is a red herring - - PowerPoint PPT Presentation

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Quenching Timescales or, why the green valley is a red herring - - PowerPoint PPT Presentation

Dec 08, 2023 448 likes •985 views

Quenching Timescales or, why the green valley is a red herring Kevin Schawinski Institute for Astronomy ETH Zurich ETH black hole group @kevinschawinski (our coffee is radio-loud) the star formation main sequence log SFR main sequence log

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SLIDE 1

Kevin Schawinski

Institute for Astronomy ETH Zurich

  • r, why the green valley is a red herring

@kevinschawinski

ETH black hole group

(our coffee is radio-loud)

Quenching Timescales

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SLIDE 2

the star formation main sequence

log stellar mass log SFR

main sequence

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SLIDE 3

the star formation main sequence

log stellar mass log SFR

main sequence

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SLIDE 4

the star formation main sequence

log stellar mass log SFR

main sequence

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SLIDE 5

the star formation main sequence

log stellar mass log SFR

main sequence

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SLIDE 6

the star formation main sequence

log stellar mass log SFR

main sequence

dead galaxies

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SLIDE 7

Galaxies are on the MS because inflows and

  • utflows balance (Bouche+10,Lilly+13)

Quenching time scales ⟺ what happens to the gas

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SLIDE 8

Galaxies are on the MS because inflows and

  • utflows balance (Bouche+10,Lilly+13)

gas inflow gas outflow

gas reservoir

Quenching time scales ⟺ what happens to the gas

slide-9
SLIDE 9

Galaxies are on the MS because inflows and

  • utflows balance (Bouche+10,Lilly+13)

gas inflow gas outflow

gas reservoir

Quenching time scales ⟺ what happens to the gas

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SLIDE 10

Galaxies are on the MS because inflows and

  • utflows balance (Bouche+10,Lilly+13)

gas inflow gas outflow

gas reservoir

Once you are no longer connected to cosmic supply of gas...

  • SFR = εMgas/τdyn
  • > SFR(t) ~ exponential

with long tau (~Gyr)

Quenching time scales ⟺ what happens to the gas

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SLIDE 11

Galaxies are on the MS because inflows and

  • utflows balance (Bouche+10,Lilly+13)

gas inflow gas outflow

gas reservoir

Once you are no longer connected to cosmic supply of gas...

  • SFR = εMgas/τdyn
  • > SFR(t) ~ exponential

with long tau (~Gyr)

Quenching time scales ⟺ what happens to the gas

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SLIDE 12

1.0 1.5 2.0 2.5 3.0 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 Early-type galaxies 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

Data

SDSS DR7 Galaxy Zoo 1 morphologies GALEX GR6 MPA-JHU masses & SFRs OSSY emission lines

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SLIDE 13

1.0 1.5 2.0 2.5 3.0 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 Early-type galaxies 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

Data

SDSS DR7 Galaxy Zoo 1 morphologies GALEX GR6 MPA-JHU masses & SFRs OSSY emission lines

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SLIDE 14

1.0 1.5 2.0 2.5 3.0 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 Early-type galaxies 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

Data

SDSS DR7 Galaxy Zoo 1 morphologies GALEX GR6 MPA-JHU masses & SFRs OSSY emission lines

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SLIDE 15

0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies 0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 Early-type galaxies 9.0 9.5 10.0 10.5 11.0 11.5 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

dust-corrected colours! Data

SDSS DR7 Galaxy Zoo 1 morphologies GALEX GR6 MPA-JHU masses & SFRs OSSY emission lines

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SLIDE 16

0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies 0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 Early-type galaxies 9.0 9.5 10.0 10.5 11.0 11.5 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

dust-corrected colours! Data

SDSS DR7 Galaxy Zoo 1 morphologies GALEX GR6 MPA-JHU masses & SFRs OSSY emission lines

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SLIDE 17

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies Early-type galaxies 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

sSFRs in the Green valley: Both early- and late-types show same low sSFR

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SLIDE 18

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies Early-type galaxies 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

sSFRs in the Green valley: Both early- and late-types show same low sSFR

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SLIDE 19

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

All galaxies Early-type galaxies 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies

sSFRs in the Green valley: Both early- and late-types show same low sSFR

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SLIDE 20

Measure* d/dt sSFR(t) of green valley galaxies

* really, broadly constrain

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SLIDE 21
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

UV-optical colours constrain d/dt sSFR(t)

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SLIDE 22
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

UV-optical colours constrain d/dt sSFR(t)

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SLIDE 23
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SLIDE 24
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

UV-optical colours constrain d/dt sSFR(t)

slide-25
SLIDE 25
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

UV-optical colours constrain d/dt sSFR(t)

slide-26
SLIDE 26
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

UV-optical colours constrain d/dt sSFR(t)

slide-27
SLIDE 27
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

UV-optical colours constrain d/dt sSFR(t)

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SLIDE 28

many blue ellipticals are (recent) merger remnants

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SLIDE 29

many blue ellipticals are (recent) merger remnants

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SLIDE 30

What about environment?

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SLIDE 31

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

Early-type galaxies Mhalo < 1012 Msun/h Early-type galaxies Mhalo > 1012 Msun/h 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo < 1012 Msun/h 9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo > 1012 Msun/h

Environment

Halo masses from DR7 catalogue of Yang+

slide-32
SLIDE 32

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

Early-type galaxies Mhalo < 1012 Msun/h Early-type galaxies Mhalo > 1012 Msun/h 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo < 1012 Msun/h 9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo > 1012 Msun/h

Environment

Halo masses from DR7 catalogue of Yang+

slide-33
SLIDE 33

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

Early-type galaxies Mhalo < 1012 Msun/h Early-type galaxies Mhalo > 1012 Msun/h 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo < 1012 Msun/h 9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo > 1012 Msun/h

Environment

Halo masses from DR7 catalogue of Yang+

slide-34
SLIDE 34

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

Early-type galaxies Mhalo < 1012 Msun/h Early-type galaxies Mhalo > 1012 Msun/h 0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0

0.0 u-r colour (dust corrected)

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo < 1012 Msun/h 9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

Late-type galaxies Mhalo > 1012 Msun/h

Environment

Halo masses from DR7 catalogue of Yang+

slide-35
SLIDE 35

Mutch, Croton & Poole (2011) Milky Way M31

slide-36
SLIDE 36

What about AGN? Is there evidence for feedback?

slide-37
SLIDE 37
  • 1

1 2 3 4 5

All Galaxies

Green Valley Early-types Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 u-r colour (dust-corr.) 1 2 3 4 5 NUV-u colour (dust-corr.)

Seyfert AGN

Early-type Galaxies

Green Valley Early-types

0.5 1.0 1.5 2.0 2.5 3.0

Seyfert AGN

Late-type Galaxies

Green Valley Late-types

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust-corr.) 1 2 3 4 NUV-u colour (dust-corr.)

8 9 10 11 12 13 Time (Gyr) star formation rate

tquench τquench=1 Myr 250 Myr 1 Gyr 2.5 Gyr

8 9 10 11 12 13 Time (Gyr)

Black Hole Growth

BPT AGN classification from Oh+12 ~10% of AGN hosts ~50% of AGN hosts

slide-38
SLIDE 38

tracing the fate of gas reservoirs clues to (rapid) quenching time scales

slide-39
SLIDE 39

9.0 9.5 10.0 10.5 11.0 11.5 Stellar Mass log M* (M O

  • )

0.5 1.0 1.5 2.0 2.5 3.0 u-r colour (dust corrected) 0.5 1.0 1.5 2.0 2.5 3.0 9.0 9.5 10.0 10.5 11.0 11.5

J0836 J0900J1117 J1237

slide-40
SLIDE 40

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

slide-41
SLIDE 41

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-42
SLIDE 42

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-43
SLIDE 43

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-44
SLIDE 44

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-45
SLIDE 45

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-46
SLIDE 46

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-47
SLIDE 47

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-48
SLIDE 48

(intermediate age stars) u-r colour (recent star formation) NUV-u colour

J0836 - HI ejected J0900 - HI ejected J1117 - HI displaced J1237 - HI rotating disk

1.0 1.5 2.0 2.5 3.0 1 2 3 4 5

HI contours radio continuum

slide-49
SLIDE 49
slide-50
SLIDE 50
slide-51
SLIDE 51
slide-52
SLIDE 52

Summary

sSFR + UV/optical colours show two different quenching pathways though green valley associated with early- and late-type galaxies and that the fate

  • f the gas reservoir is the key difference

Late-type galaxies quench slowly, without changing morphology (d/dt sSFR small) due to an external process that stops further inflow/cooling of gas; could correspond to classical environmental mechanisms. Early-type galaxies quench rapidly, during or after merger-driven change of morphology (d/dt sSFR large) due to an internal process that destroys the gas reservoir, possibly AGN feedback?

@kevinschawinski

read the paper at: http://arxiv.org/abs/1402.4814

slide-53
SLIDE 53

Summary

sSFR + UV/optical colours show two different quenching pathways though green valley associated with early- and late-type galaxies and that the fate

  • f the gas reservoir is the key difference

Late-type galaxies quench slowly, without changing morphology (d/dt sSFR small) due to an external process that stops further inflow/cooling of gas; could correspond to classical environmental mechanisms. Early-type galaxies quench rapidly, during or after merger-driven change of morphology (d/dt sSFR large) due to an internal process that destroys the gas reservoir, possibly AGN feedback?

@kevinschawinski

read the paper at: http://arxiv.org/abs/1402.4814