Gas disk rotational speed in unit of circular speed

Kunyang Li
  • 14 Apr

Hi, Dylan,

Hope everything is going well!

I need the gas disk or stellar disk rotational velocity of galaxies in unit of the circular velocity. I wonder is there anyway to find this information in TNG50 and TNG300?

Thank you very much for your help!!

Best regards,

Lily

Dylan Nelson
  • 14 Apr

Hello,

The only catalog value related to rotation velocity is SubhaloVmax described as "Maximum value of the spherically-averaged rotation curve".

If you want an actual rotation velocity of gas or stars, you would need to compute this yourself from the particle data. You could follow a procedure similar to that in Pillepich+2019 (page 8) for example.

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