For kinematics of galaxies how we can figure out the velocity map in TNG for gas or stars?
I'll be grateful for your help .
Dylan Nelson
21 Dec '20
Hello,
If you would like some images or examples, you can use the Visualize Galaxies and Halos tool. Select "gas" or "stars" as the particle type, and vel_los as the field.
If you select edge-on rotation, and set the image size to e.g. 5.0 in units of rHalfMassStars, you should see the typical red-blue signature of a rotating disk, for most intermediate mass halos. Fig 6 of the data release paper shows an example of this.
If you would like to compute such maps, the easiest way is to adopt the x-y axes as the image plane, projecting along the z direction. Then the "line of sight velocity" is simply Velocities[2] and you can create an image, or other analysis, from this (gas cell/star particle) field.
Hi Dylan,
For kinematics of galaxies how we can figure out the velocity map in TNG for gas or stars?
I'll be grateful for your help .
Hello,
If you would like some images or examples, you can use the Visualize Galaxies and Halos tool. Select "gas" or "stars" as the particle type, and
vel_losas the field.If you select edge-on rotation, and set the image size to e.g. 5.0 in units of rHalfMassStars, you should see the typical red-blue signature of a rotating disk, for most intermediate mass halos. Fig 6 of the data release paper shows an example of this.
If you would like to compute such maps, the easiest way is to adopt the
x-yaxes as the image plane, projecting along thezdirection. Then the "line of sight velocity" is simplyVelocities[2]and you can create an image, or other analysis, from this (gas cell/star particle) field.Hello,
Thank you very much for your help.