Wednesday, March 9, 2011
Halo Gallery II
The previous halo gallery was annoying because it was impossible to see structure, because the plots wer saturated. I thinned the particles out by a factor of 50... Here are the same set of halos, with slightly better contrast.
Halo Gallery
I have automated plot making, and have generated a gallery of 7 halos, that exist in mikes directory path = '/u/msw/lcdm_me/4-512/halos/'
The plots show 6 snapshots of the locations of particles whose velocities were within 100km/s of the fastest particle in each radial bin at z~0.
You can click on the plots to make them larger. I didn't find these super interesting, honestly. There seem to be two classes, round, and not round... and the round ones have a tendency to have a ring of higher v particles around the outside... In all cases it seems like bulk motion happens more than evolution in the shape of the distribution of high v particles since z~1, which continues to surprise me.
Incidentally, I was using the halo files in the halo directory (on which the subhalo finder has not yet been run) and it makes me nervous that halo 4 does not seem to agree with the plots I made using the halo_iso_004 file (which should have the same particles, just with subhalo labels). Another worrysome thing, it looks like several of these halos are in roughly the same spot, and the particles they are built out of all overlap, does this bother anybody else??
The plots show 6 snapshots of the locations of particles whose velocities were within 100km/s of the fastest particle in each radial bin at z~0.
You can click on the plots to make them larger. I didn't find these super interesting, honestly. There seem to be two classes, round, and not round... and the round ones have a tendency to have a ring of higher v particles around the outside... In all cases it seems like bulk motion happens more than evolution in the shape of the distribution of high v particles since z~1, which continues to surprise me.
Incidentally, I was using the halo files in the halo directory (on which the subhalo finder has not yet been run) and it makes me nervous that halo 4 does not seem to agree with the plots I made using the halo_iso_004 file (which should have the same particles, just with subhalo labels). Another worrysome thing, it looks like several of these halos are in roughly the same spot, and the particles they are built out of all overlap, does this bother anybody else??
Friday, March 4, 2011
Old plots
Here are some old plots, I am finally getting around to starting a record for this project. I'll just cut/paste the emails I sent along with these. You can click on the plots to make them larger.
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Look, I made a pretty picture of some subhalos :)
Alexia
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I dont think this was in an email, but this plot ennumerates the number of unique subhalos that particles of very high velocity belong to. The fact that this is not flat implies that high velocity particles typically occupy many distinct subhalos.
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Here are two plots. These are made by breaking the particles into radial bins, and studying the top N highest velocity particles. The first is similar to the plot I made before, that demonstrated that the highest velocity particles in the halo did not belong to only a few distict subhalos. This plot shows that this statement is true at all radii, but that high velocity particles are slightly more clumped at large r than at small r.
The second is the plot Alex asked me to make (or some version thereof). It shows slices through physical and velocity spaces. This plot shows the 30 highest velocity particles in each of 70 linearly spaced radial bins, color coded by radius. There are stream-like features at higher r, and they appear to be spatially non-local, but they aren't as screamingly obvious as I would have thought given Alex's sphere movie. I've attached a similar plot where the color coding is by subhalo... so you can convince yourself that these streamy things are not actually subhalos, which was my first impression.
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Attached are the plots Daniel asked me to make. The number within 100km/s of max is highly variable. But the streams are much more apparent with this scheme.
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I removed the center (whose velocities were isotropic anyhow) and reduced the number of bins to 30. Here are the same two plats as in the last email.
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Attached are 4 plots. One plots has 3 subplots which are three projections of the z=0 (well -0.0002 actually) positions of the highest velocity particles in one of the halos of the simulation. These are the particles that are within 100 km/s of the highest v particle at each of a bunch of concentric radial bins.
The other three plots show the positions of the particles at several earlier redshifts going back to z=1(one plot for each projection).
Assuming the units of x,y,z is kpc, it looks to me like this is a largish halo with diameter around 2Mpc, and that all of the highest V particles were already inside the halo by z=1. They were living in a number of fairly compact structures, that gradually got fuzzier as time went along. Note, these are not the highest v particles at each redshift, they are the same set of particles in each picture (those with highest V at z=0).
By the way, maybe this stuff is just outside the halo, because it's not orbiting around, it's stationary roughly, since z=1.
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Look, I made a pretty picture of some subhalos :)
Alexia
-------------------------------------------------------------------------------------
I dont think this was in an email, but this plot ennumerates the number of unique subhalos that particles of very high velocity belong to. The fact that this is not flat implies that high velocity particles typically occupy many distinct subhalos.
-------------------------------------------------------------------------------------
Here are two plots. These are made by breaking the particles into radial bins, and studying the top N highest velocity particles. The first is similar to the plot I made before, that demonstrated that the highest velocity particles in the halo did not belong to only a few distict subhalos. This plot shows that this statement is true at all radii, but that high velocity particles are slightly more clumped at large r than at small r.
The second is the plot Alex asked me to make (or some version thereof). It shows slices through physical and velocity spaces. This plot shows the 30 highest velocity particles in each of 70 linearly spaced radial bins, color coded by radius. There are stream-like features at higher r, and they appear to be spatially non-local, but they aren't as screamingly obvious as I would have thought given Alex's sphere movie. I've attached a similar plot where the color coding is by subhalo... so you can convince yourself that these streamy things are not actually subhalos, which was my first impression.
-------------------------------------------------------------------------------------
Attached are the plots Daniel asked me to make. The number within 100km/s of max is highly variable. But the streams are much more apparent with this scheme.
I removed the center (whose velocities were isotropic anyhow) and reduced the number of bins to 30. Here are the same two plats as in the last email.
Attached are 4 plots. One plots has 3 subplots which are three projections of the z=0 (well -0.0002 actually) positions of the highest velocity particles in one of the halos of the simulation. These are the particles that are within 100 km/s of the highest v particle at each of a bunch of concentric radial bins.
The other three plots show the positions of the particles at several earlier redshifts going back to z=1(one plot for each projection).
Assuming the units of x,y,z is kpc, it looks to me like this is a largish halo with diameter around 2Mpc, and that all of the highest V particles were already inside the halo by z=1. They were living in a number of fairly compact structures, that gradually got fuzzier as time went along. Note, these are not the highest v particles at each redshift, they are the same set of particles in each picture (those with highest V at z=0).
By the way, maybe this stuff is just outside the halo, because it's not orbiting around, it's stationary roughly, since z=1.
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