Interstellar Medium and Star Formationin the Andromeda Galaxy
Andreas SchrubaCalifornia Institute of Technology
Adam Leroy, Karin Sandstrom, Fabian Walter,Alberto Bolatto, Nick Scoville, Julianne Dalcanton
Phases of the ISMHeidelberg, July 29 – Aug 1, 2013
Regulation of Star Formation in Molecular GasRingberg, June 24-28, 2013
CO Map from IRAM 30m
IRAM 30m:
85 pc x 2.5 km/srms ~ 30 mK
500pc
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CO Map from CARMA
CARMA:
175 hours335 p mosaic
20 pc x 1 km/srms ~ 250 mK
500pc
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Cloud Decomposition
CPROPStooRosolowsky & Leroy 2006;Leroy et al. (in prep)• locate “islands” • break into “clouds”• get moments & flux
500pc
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Cloud Decomposition
500pc
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Cloud Decomposition
500pc
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Cloud Properties I
Aspect Ratio
Radius
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Limit Velocity DispersionLimit
Peak TemperatureLimit
Cloud Properties IILuminous MassLim
it
Virial MassLimit
Virial Parameter
Grav
itatio
nal S
tabi
lity
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‘Larson’ ParameterLimit
Linewidth – Size Relation
spirals
dwarfs
outer disk
Luminosity – Radius Relation
spirals
dwarfs
outer disk
Larson’s “Parameter”
spirals
dwarfs
outerdisk fix
ed ex
terna
l pres
sure
(Field
et al
. 201
1)
What controls nature of clouds (ie offsets)?… concordance of properties for neighboring clouds?
Concordance of Cloud Nature?500pc
avg cloud properties (σ2/l) for neighboring clouds
Concordance of Cloud Nature?Distance H2 Surface Density @ 200pc
SFR Surface Density @ 200pcCloud Mass
Cloud Motions
Concordance of Cloud Motions?Distance H2 Surface Density @ 200pc
SFR Surface Density @ 200pcCloud Mass
PHAT SF Histories Grad: Alexia Lewis(U Washington)
Poster
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PHAT Cluster Catalog Grad: Lori Beerman(U Washington)
PHAT Extinction MapExtinction AV = 1, 2, 3 mag
Julianne Dalcanton(U Washington)
PHAT Extinction Map
Extinction
Figure Credit:Cheoljong Lee (UVA)
Julianne Dalcanton(U Washington)
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PHAT Extinction Map
Dust Mass
Figure Credit:Cheoljong Lee (UVA)
Bruce Draine(Princeton)
PHAT Extinction Map
Atomic GasExtinctionMolecular Gas
Figure Credit:Cheoljong Lee (UVA)
Grad: Cheoljong Lee(U Virginia)
Regulation of Star Formation in Molecular GasRingberg, June 24-28, 2013
Final CARMA Surveypointings: 1500area: 0.1 deg2 ~ 15 kpc2
beam: 20pc x 1 km/s clouds: 500-1000completion: end 2013