how does hi content depend on galaxy mass? · puddling and quenching: how does hi content depend on...
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PuddlingPuddling and Quenching:and Quenching:How Does HI Content Depend How Does HI Content Depend
on Galaxy Mass?on Galaxy Mass?
Sheila Sheila KannappanKannappan
UNC Chapel HillUNC Chapel Hill
with help from David Stark, Lisa Wei, with help from David Stark, Lisa Wei,
D.J. Pisano, Amanda Moffett, & Kathleen EckertD.J. Pisano, Amanda Moffett, & Kathleen Eckert
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Q: what is the most commonly used Q: what is the most commonly used predictor of Mpredictor of MHIHI/M/M** by theorists?by theorists?
A: stellar massA: stellar mass
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explore with volumeexplore with volume--limited subsample of limited subsample of ALFALFA+SDSSALFALFA+SDSS
(Haynes et al. 2011 (Haynes et al. 2011 αα40 data release)40 data release)
approx. 3000 galaxies between cz=2500-7000 km/sselection: SDSS Mr<-17.23 + HyperLeda (≈CfA survey)
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looks like a correlationlooks like a correlation……�� custom custom
reprocessed reprocessed
ugrizJHKugrizJHK
photometryphotometry
�� stellar masses stellar masses
from SED fittingfrom SED fitting
�� upper limits using upper limits using
rr--band TFR + band TFR +
photometric photometric
inclination inclination
(preliminary) (preliminary) ……but covariant and but covariant and full of upper limitsfull of upper limits
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try V, a more fundamental mass metrictry V, a more fundamental mass metric……
strong upper limits in HI inventory for broadly strong upper limits in HI inventory for broadly
representative Nearby Field Galaxy Surveyrepresentative Nearby Field Galaxy Survey(new GBT data: Wei + 2010a; (new GBT data: Wei + 2010a; KannappanKannappan + in prep)+ in prep)
ALFALFA underlaid
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discrete regimes? discrete regimes?
puddled
quenched
normal
Kannappan + 2012 in prep
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discrete regimes? discrete regimes?
puddled
quenched
normal
puddled regime
- divergence of stellar and baryonic Tully-Fisher relations
- sharp changes in metallicity and dust (Garnett 2002; Dalcanton + 2004)
– connection to cold accretion scale? (Dekel & Birnboim2006; Krumholz & Dekel 2012)
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discrete regimes? discrete regimes?
puddled
quenched
normal
“fueling diagram”(Stark talk Tues.)
central blueing �
molecular-to-atomic gas ratio �
<130
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discrete regimes? discrete regimes?
puddled
quenched
normal
quenched regime clear in U-K color:
(notice what does correlate with MHI/M*
� accretion again?)
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……so is there any so is there any continuouscontinuous mass mass dependence?dependence?
simulated data in very simple model: first add covariance, then M* errors…
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……so is there any so is there any continuouscontinuous mass mass dependence?dependence?
simulated data in very simple model: first add covariance, then M* errors…
then flux-limited selection
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……so is there any so is there any continuouscontinuous mass mass dependence?dependence?
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conclusionsconclusions
�� HI content correlates poorly with massHI content correlates poorly with mass
�� we must entertain the possibility that the we must entertain the possibility that the
rise & fall of three discrete regimes rise & fall of three discrete regimes
((puddledpuddled, normal, quenched) creates any , normal, quenched) creates any
correlation we seecorrelation we see
�� these three regimes might simply be these three regimes might simply be
defined by excess accretion, normal cyclic defined by excess accretion, normal cyclic
accretionaccretion--inflowinflow--consumption, and consumption, and
quenched accretionquenched accretion