HALO FINDING IN ENZO, ART, AND GADGEThipacc.ucsc.edu/html/HIPACCLectures/hipacc.pdf · HALO FINDING...
Transcript of HALO FINDING IN ENZO, ART, AND GADGEThipacc.ucsc.edu/html/HIPACCLectures/hipacc.pdf · HALO FINDING...
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HALO FINDING INENZO, ART, AND GADGET
Peter Behroozi, Stanford UniversityUC-HIPACC Summer School 2010
Friday, August 13, 2010
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HALO FINDING IN ENZO
Peter Behroozi, Stanford UniversityUC-HIPACC Summer School 2010
Actually, mostly just:
Friday, August 13, 2010
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The Simulation128 cubed root mesh, 60 Mpc/h, WMAP5 cosmology
Circles represent halo maximum radiiFriday, August 13, 2010
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Halo Finding Algorithms Bundled with ENZO
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Halo Finding Algorithms Bundled with ENZO
HOP / Parallel HOP(particles attached to same halo as the densest
particle in their N nearest neighbors)
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Halo Finding Algorithms Bundled with ENZO
HOP / Parallel HOP(particles attached to same halo as the densest
particle in their N nearest neighbors)
FOF / SUBFIND(particles attached to same halo as their nearest
neighbors within a specified linking length)
Friday, August 13, 2010
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Which one is better?
HOP / Parallel HOP(particles attached to same halo as the densest
particle in their N nearest neighbors)
FOF / SUBFIND(particles attached to same halo as their nearest
neighbors within a specified linking length)
Friday, August 13, 2010
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Quantitative Tests
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Quantitative Tests
How consistent are halo positionsand velocities from onetimestep to the next?
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Quantitative Tests
How consistently can the growth ofstructure be traced from the
halo catalogs?
How consistent are halo positionsand velocities from onetimestep to the next?
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Quantitative TestsAll tests performed using a new gravitational
consistency code under development for repairingmerger trees and halo catalogs.
F =GM1M2
r2 + r2vir
dF
dr=
2GM1M2
r3> Tmin
Gravitational Acceleration
Tidal Merger Criterion
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Quantitative Results
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Quantitative ResultsPositional Consistency:
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.1
0.2
0.3
0.4
0.5
Avg
. Pos
ition
al E
rror
in H
alo
Trac
king
(Cm
vng
Mpc
/h)
M ~ 1011.25
M ~ 1012
M ~ 1013
M ~ 1014
How robust are halo properties?
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0.1
0.2
0.3
0.4
0.5
Avg
. Pos
ition
al E
rror
in H
alo
Trac
king
(Cm
vng
Mpc
/h)
M ~ 1011.25
M ~ 1012
M ~ 1013
M ~ 1014
(Force resolution of simulation: 15 kpc/h)
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Quantitative ResultsInertial Consistency:
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
40
80
120
160
200
240
280
Avg
. Vel
ocity
Err
or in
Hal
o Tr
acki
ng (k
m/s
)
M ~ 1011.25
M ~ 1012
M ~ 1013
M ~ 1014
How robust are halo properties?
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
40
80
120
160
200
240
280
Avg
. Vel
ocity
Err
or in
Hal
o Tr
acki
ng (k
m/s
)
M ~ 1011.25
M ~ 1012
M ~ 1013
M ~ 1014
Friday, August 13, 2010
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Quantitative ResultsFraction of halos missing at the previous timestep:
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.1
0.2
0.3
Frac
tion
of H
alos
With
out P
roge
nito
rs
M ~ 1011
M ~ 1012
M ~ 1013
M ~ 1014
How useful are the catalogs for merger trees?
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.1
0.2
0.3
Frac
tion
of H
alos
With
out P
roge
nito
rs
M ~ 1011
M ~ 1012
M ~ 1013
M ~ 1014
Friday, August 13, 2010
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Quantitative ResultsFraction of halos missing at the next timestep:
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.1
0.2
0.3
Frac
tion
of H
alos
Rem
aini
ng W
ithou
t Des
cend
ants
M ~ 1011
M ~ 1012
M ~ 1013
M ~ 1014
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.1
0.2
0.3
Frac
tion
of H
alos
Rem
aini
ng W
ithou
t Des
cend
ants
M ~ 1011
M ~ 1012
M ~ 1013
M ~ 1014
How useful are the catalogs for merger trees?
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Quantitative Results
Side note: Increased Resolution Helps a Great Deal!
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.01
0.02
Frac
tion
of H
alos
Rem
aini
ng W
ithou
t Des
cend
ants
M ~ 1010
M ~ 1011
M ~ 1012
M ~ 1013
M ~ 1014
(Bolshoi)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Scale Factor
0
0.01
0.02
0.03
0.04
Frac
tion
of H
alos
Rem
aini
ng W
ithou
t Des
cend
ants
M ~ 1011
M ~ 1012
M ~ 1013
M ~ 1014
(Consuelo)
(GADGET-2) (ART)(2.7 billion particles) (8.6 billion particles) (1400 particles)
Fraction of halos missing at the next timestep
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Halo Finders in Action!
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Thanks for your attention!Peter Behroozi
Friday, August 13, 2010
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Quantitative ResultsHalo Tracking Consistency
1 2 3 4 51+z
0.01
0.1
1
Frac
tion
of H
alos
Tra
cked
Vmax ~ 100 km/sVmax ~ 200 km/sVmax ~ 400 km/sVmax ~ 800 km/s
1 2 3 4 5 61+z
0.01
0.1
1
Frac
tion
of H
alos
Tra
cked
Vmax ~ 100 km/sVmax ~ 200 km/sVmax ~ 400 km/sVmax ~ 800 km/s
Friday, August 13, 2010
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Image Credits
http://www.elcivics.com/easter_esl_holidays_3
http://www.myfreewallpapers.net/
vehicles/pages/submarine.shtml
http://farm4.static.flickr.com/3172/2297142898_8fae4627e7_
o.jpg
http://embryology.med.unsw.edu.a
u/wwwhuman/Stages/Images/Cst800.jpg
http://www.virtualmuseum.ca/Exhibitions/Annodomini/
THEME_15/IMAGES/J991825.jpg
Friday, August 13, 2010