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![Page 1: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/1.jpg)
VOYAGE Virtual Observatory, Yet Another Great Extension ?!
should simulation data be included in a Virtual Observatory ?
Alexander Knebe, Swinburne University
• what ? • why ?
• how ?
…this is all biased towards cosmological n-body simulations
![Page 2: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/2.jpg)
VOYAGE what are (cosmological) simulations anyway ?
what ?
![Page 3: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/3.jpg)
• rotation curves of galaxiesrotation curves of galaxies
existence of Dark Matter DM
• hierarchical structure formationhierarchical structure formation
nature of Dark Matter CDM
• high redshift observationshigh redshift observations
cosmology CDM
testing model using N-body simulations reveals…
(Bahcall et al. 2001)
VOYAGE what determines the model ?
what ?
model fixed ?
ob
serv
atio
ns
ob
serv
atio
ns
![Page 4: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/4.jpg)
• high resolution N-body simulations:high resolution N-body simulations: • observations:observations:
• steep, cuspy density profiles
• hundreds of satellite galaxies
• small disk sizes
• mostly shallow density cores
• only a few satellites observed
• larger disk sizes
what ?
VOYAGE what’s the problem ?
breakdown of CDM paradigm on scales < 1 Mpc ?
![Page 5: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/5.jpg)
VOYAGE time for a VOYAGE ?
i.e., observed number ofsatellite galaxies orbiting
in dark matter halo
more data needed:• from observers• from simulators
why ?correctly measured?
correct models ?
(Klypin et al. 1999)
![Page 6: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/6.jpg)
VOYAGE why should VO be extended ?
simulations are time intensive
simulations contain 6D information: x(t), v(t)
cross-comparison of models possible
let’s pull the strings together:
• problems get solved only by exchange of ideas
• simulators need observers to gauge and improve models
• observers need simulators to calibrate observations
why ?
![Page 7: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/7.jpg)
VOYAGE simulations lead to observations ?!
one ring encompasses it all ?
simulated tidal stream of disrupted satellite galaxy
milky way type dark matter halo
observed stellar stream in own milky way halo
why ?
(Odenkirchen et al. 2003)
(Gill et al. 2002)
![Page 8: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/8.jpg)
VOYAGE a little survey
what code do you use ?
0 20 40 60 80 100
public
own
what analysis tools do you use ?
0 20 40 60 80 100
IDL
own
what sort of data do you store ?
0 20 40 60 80 100
grid
particles
what do you compare your data to ?
0 20 40 60 80 100
observations
others other models
own other models
would you make your data available ?
0 20 40 60 80 100
no
already available
yes
based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations,IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470)
how ?
![Page 9: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/9.jpg)
VOYAGE has the VOYAGE already begun ?
all in non-compatible data formats,but the data is being used !
VIRGO SCDM, CDM, OCDM, CDM model2563 particles
239.5 Mpc/h box
“Hubble Volume” CDM, CDM model10243 particles3000 Mpc/h box
“COBE grid” 68 (COBE-normalized) models (more than you can poke a stick at…)
643 particles128 Mpc/h box
NEMO data archive collection of links to data releases
plus some more by individual groups…
how ?
![Page 10: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/10.jpg)
VOYAGE can one feed on data alone ?
how ?
MLAPM adaptive multi-grid code (Knebe et al. 2001)
GADGET tree-SPH code (Springel et al. 2000)
HYDRA AP3M code (Couchman et al. 1995)
hierarchical TreeCode ultra-fast (!?) tree code (Dehnen 2000)
PM code simple PM code (Klypin 1995)(incl. analysis tools !)
available codes: (mostly no analysis tools distributed !)
http://astronomy.swin.edu.au/cosmology
most codes are proprietary products !
![Page 11: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/11.jpg)
VOYAGE is there any consistency ?
how ?
The Santa Barbara Cluster Comparison Project (Frenk et al. 1999)
• the oponents
6 Lagrangian codes (particle based)vs.
5 Eulerian codes (grid based)
• the outcome
reassuring but also confusing
• the winner
?
![Page 12: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/12.jpg)
VOYAGE what’s the bottomline ?
how ?
add data
add basic analysis (“simulated observations”)
add software:
codes
analysis tools
![Page 13: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/13.jpg)
VOYAGE is it feasible ?
hmm ?
requires great coordination
requires input from simulators
simulations outdate quickly...
![Page 14: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/14.jpg)
VOYAGE Swinburne’s contribution
!!!
MLAPM is already publically available http://astronomy.swin.edu.au/MLAPM
next MLAPM version will contain on-the-fly analysis
we do have sophisticated visualisation tools for MLAPM data
we do have high-resolution data (cf. Daisuke Kawata’s talk)
we are more than happy to be part of this VOYAGE !
![Page 15: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/15.jpg)
VOYAGE Swinburne’s contribution
!!!
filament fragmentation
C
DM
W
DM
z=5 z=3 z=1 z=0
(Knebe et al. 2003)
![Page 16: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/16.jpg)
VOYAGE Swinburne’s contribution
!!!
streams from disrupted satellite galaxies
(Gill et al. 2002)
![Page 17: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/17.jpg)
VOYAGE Virtual Observatory, Yet Another Great Extension ?!
thank you for your attentionand
bon voyage...
Alexander Knebe, Swinburne University
![Page 18: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/18.jpg)
VOYAGE is there any consistency ?
how ?
The Santa Barbara Cluster Comparison Project
grid based codes
particle based codes
particle based codes
grid based codes
temperature profile entropy profile
(Frenk et al. 1999)
![Page 19: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/19.jpg)
VOYAGE a little survey
what analysis tools do you use ?
0 20 40 60 80 100
IDL
own
what sort of data do you store ?
0 20 40 60 80 100
grid
particles
what do you compare your data to ?
0 20 40 60 80 100
observations
others other models
own other models
would you make your data available ?
0 20 40 60 80 100
no
already available
yes
based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations,IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470)
how ?
what code do you use ?
0 20 40 60 80 100
public
own
![Page 20: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/20.jpg)
VOYAGE a little survey
what code do you use ?
0 20 40 60 80 100
public
own
what sort of data do you store ?
0 20 40 60 80 100
grid
particles
what do you compare your data to ?
0 20 40 60 80 100
observations
others other models
own other models
would you make your data available ?
0 20 40 60 80 100
no
already available
yes
based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations,IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470)
how ?
what analysis tools do you use ?
0 20 40 60 80 100
IDL
own
![Page 21: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/21.jpg)
VOYAGE a little survey
what code do you use ?
0 20 40 60 80 100
public
own
what analysis tools do you use ?
0 20 40 60 80 100
IDL
own
what do you compare your data to ?
0 20 40 60 80 100
observations
others other models
own other models
would you make your data available ?
0 20 40 60 80 100
no
already available
yes
based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations,IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470)
how ?
what sort of data do you store ?
0 20 40 60 80 100
grid
particles
![Page 22: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/22.jpg)
VOYAGE a little survey
what code do you use ?
0 20 40 60 80 100
public
own
what analysis tools do you use ?
0 20 40 60 80 100
IDL
own
what sort of data do you store ?
0 20 40 60 80 100
grid
particles
would you make your data available ?
0 20 40 60 80 100
no
already available
yes
based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations,IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470)
how ?
what do you compare your data to ?
0 20 40 60 80 100
observations
others other models
own other models
![Page 23: VOYAGE Virtual Observatory, Yet Another Great Extension ?! should simulation data be included in a Virtual Observatory ? Alexander Knebe, Swinburne University.](https://reader035.fdocuments.in/reader035/viewer/2022070307/551af64e5503462e578b4c2a/html5/thumbnails/23.jpg)
VOYAGE a little survey
what code do you use ?
0 20 40 60 80 100
public
own
what analysis tools do you use ?
0 20 40 60 80 100
IDL
own
what sort of data do you store ?
0 20 40 60 80 100
grid
particles
what do you compare your data to ?
0 20 40 60 80 100
observations
others other models
own other models
would you make your data available ?
0 20 40 60 80 100
no
already available
yes
based on questionaire returned by 53 out of 106, Astrophysical Supercomputing Using Particle Simulations,IAU Symposium 208, Tokyo, July 2001 (P. Teuben, astro-ph/0204470)
how ?