Transcript Schruba13_Heidelberg

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
Regulation of Star Formation in Molecular Gas
Ringberg, June 24-28, 2013
CO Map from IRAM 30m
Brick 15
IRAM 30m:
85 pc x 2.5 km/s
rms ~ 30 mK
500pc
CO Map from CARMA
Brick 15
CARMA:
175 hours
335 p mosaic
20 pc x 1 km/s
rms ~ 250 mK
500pc
Cloud Decomposition
Brick 15
CPROPStoo
Rosolowsky & Leroy 2006;
Leroy et al. (in prep)
• locate “islands”
• break into “clouds”
• get moments & flux
500pc
Cloud Decomposition
Brick 9
500pc
Cloud Decomposition
Brick 21
500pc
Limit
Limit
Cloud Properties I
Radius
Velocity Dispersion
Brick 15
Aspect Ratio
Limit
Brick 9
Peak Temperature
Limit
Luminous Mass
‘Larson’ Parameter
Gravitational Stability
Limit
Limit
Cloud Properties II
Virial Mass
Virial Parameter
Brick 15
Brick 9
Linewidth – Size Relation
spirals
dwarfs
outer disk
Luminosity – Radius Relation
spirals
dwarfs
outer disk
Larson’s “Parameter”
What controls nature of clouds (ie offsets)?
… concordance of properties for neighboring clouds?
outer
disk
spirals
dwarfs
Concordance of Cloud Nature?
500pc
avg cloud properties
(σ2/l) for neighboring
clouds
Concordance of Cloud Nature?
Distance
H2 Surface Density @ 200pc
Cloud Mass
SFR Surface Density @ 200pc
Cloud Motions
Concordance of Cloud Motions?
Distance
H2 Surface Density @ 200pc
Cloud Mass
SFR Surface Density @ 200pc
PHAT SF Histories
Brick 16
Brick 15
Grad: Alexia Lewis
(U Washington)
PHAT Cluster Catalog
Grad: Lori Beerman
(U Washington)
PHAT Extinction Map
Extinction AV = 1, 2, 3 mag
Julianne Dalcanton
(U Washington)
Julianne Dalcanton
(U Washington)
PHAT Extinction Map
Extinction
Brick 15
Figure Credit:
Cheoljong Lee (UVA)
Bruce Draine
(Princeton)
PHAT Extinction Map
Dust Mass
Figure Credit:
Cheoljong Lee (UVA)
PHAT Extinction Map
Grad: Cheoljong Lee
(U Virginia)
Atomic Gas
Extinction
Molecular Gas
Figure Credit:
Cheoljong Lee (UVA)
Regulation of Star Formation in Molecular Gas
Ringberg, June 24-28, 2013
Final CARMA Survey
pointings: 1500
area: 0.1 deg2 ~ 15 kpc2
beam: 20pc x 1 km/s
clouds: 500-1000
completion: end 2013