Low-z Galaxy
Scaling Relations
Or, “Here are Some of my
Favourite Log-Log Plots”
Chris Clark
17/8/2020
ISM✻@ST Group Meeting Talk
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Low-z Galaxy
Scaling Relations
Or, “Here are Some of my
Favourite Log-Log Plots”
Chris Clark
17/8/2020
ISM✻@ST Group Meeting Talk
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Chris Clark
Clark+ (2015)
Scaling Relations‽
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Chris Clark
Constant Vigilance
Kennicutt (1989, 1998)
~ Molecular Gas Mass
~ Star Formation Rate
The Kennicutt-Schmidt Relation
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Chris Clark
Constant Vigilance
Kennicutt (1998), Smith (priv. comm.)
Cigar
Yellowstone Park
Forest Fire
Venus
Jeep Cherokee sitting in
closed garage for 1 hour
Observable
Universe
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Chris Clark
Constant Vigilance
Kennicutt (1998)
~ Star Formation Rate
~ Molecular Gas Mass
The Kennicutt-Schmidt Relation
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Chris Clark
The Tully-Fisher Relation
Tully & Fisher (1977)
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Chris Clark
The Baryonic Tully-Fisher Relation
Freeman (1999); Walker (1999); McGaugh (2000,2020); Lelli+ (2015); Ponomareva+ (2018)
T-F relation for
just stellar mass
T-F relation for
baryonic mass (stars + HI)
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Chris Clark
Ultra-Diffuse Galaxies Break the BTF?
Van Dokkum+ (2018); Mancera-Piña+ (2019)
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Chris Clark
Super Spirals Break the BTF Relation?
Ogle+ (2019)
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Chris Clark
Super Spirals Break Every Relation?
Fall (1983); Ogle+ (2019)
j∗
= 2vmax
Roptical
(specific stellar angular momentum)
The Fall Relation The Star Forming Main Sequence
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017)
MHI
/ M✻
H2
Depletion Time
MH2
/ M✻
GASS: GALEX Arecibo SDSS Survey HI for 1000 SDSS+GALEX galaxies with M✻
>1010 & 0.025109 for 530 galaxies total
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2016,2017)
Constant SSFR
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017); Catinella (2015)
MHI
/ M✻
SSFR = SFR / M✻
MH2
/ M✻
SSFR = 0.1 Gyr-1
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017); Catinella (2015)
SFR / M✻
MH2
/ M✻
SSFR = 0.1 Gyr-1
The Kennicutt-
Schmidt Relation!
MH2
SFR
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017); Catinella (2015)
MHI
/ M✻
SSFR = SFR / M✻
MH2
/ M✻
SSFR = 0.1 Gyr-1
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017); Catinella (2015)
H2
Depletion Time
MH2
/ MHI
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017); Catinella (2015)
H2
Depletion Time
MH2
/ MHI
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Chris Clark
Cold Gas and the Danger Zone
Saintonge+ (2011,2016,2017); Catinella+ (2015)
H2
Depletion Time
MH2
/ MHI
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Chris Clark
Big Differences Between Galaxies
Gallagher+ (2018); Sun+ (2018)
PHANGS
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Chris Clark
Dust Evolution with Metallicity
Rémy-Ruyer+ (2014); Galliano+ (2018)
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Chris Clark
Dust Evolution with Metallicity
Clark+ (2015); De Vis+ (2017)
< Gas-Dominated Star-Dominated >
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Chris Clark
ISM Scaling in Different Environments
Cortese+ (2011); Boselli+ (2013); Davies+ (2019); Old+ (2020)
But…
(Star-Formation Efficiency)
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Chris Clark
Conclusions
Big things are big.
Generally.
(The devil is in the detail.)
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Chris Clark
MH2
/MHI
versus Dust-to-Gas
Casasola+ (2019)