Interstellar Medium and Star Formation in the Andromeda Galaxy
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Interstellar Medium and Star Formation in the Andromeda Galaxy Andreas Schruba California Institute of Technology Adam Leroy, Karin Sandstrom, Fabian Walter, Alberto Bolatto, Nick Scoville, Julianne Dalcanton ases of the ISM idelberg, July 29 – Aug 1, 2013
description
Phases of the ISM Heidelberg, July 29 – Aug 1, 2013. Interstellar Medium and Star Formation in the Andromeda Galaxy. Andreas Schruba California Institute of Technology Adam Leroy, Karin Sandstrom , Fabian Walter, Alberto Bolatto , Nick Scoville , Julianne Dalcanton. - PowerPoint PPT Presentation
Transcript of Interstellar Medium and Star Formation in the Andromeda Galaxy
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
