I want to calculate the Ram pressure exerted on a satellite within a given cluster by calculating the mean velocity of the medium that is at larger distances than 20 times the half mass radius of the satellite. However, I would like to consider just the contribution of the unbound cells by neglecting the contribution of all those cells that are bound to a satellite galaxy. How could I know if a gas cell of the halo is bounded to a satellite?

Thanks in advance,
Pablo

Dylan Nelson

3 Nov '21

Dear Pablo,

If you load all particles/cells which belong to the central subhalo, instead of the entire FoF halo, then by definition this excludes particles bound to all satellites.

I also suggest to check out Ayromlou+2019 for some discussions on this calculation and a method to do this exclusion more cleanly.

Pablo Galan de Anta

3 Nov '21

Dear Dylan,

many thanks for your answer. I was using the definition of Yun+2019, but I think the definition they use of ram pressure is practically the same as the one in Ayromlou+2019.

Hi,

I want to calculate the Ram pressure exerted on a satellite within a given cluster by calculating the mean velocity of the medium that is at larger distances than 20 times the half mass radius of the satellite. However, I would like to consider just the contribution of the unbound cells by neglecting the contribution of all those cells that are bound to a satellite galaxy. How could I know if a gas cell of the halo is bounded to a satellite?

Thanks in advance,

Pablo

Dear Pablo,

If you load all particles/cells which belong to the central subhalo, instead of the entire FoF halo, then by definition this excludes particles bound to all satellites.

I also suggest to check out Ayromlou+2019 for some discussions on this calculation and a method to do this exclusion more cleanly.

Dear Dylan,

many thanks for your answer. I was using the definition of Yun+2019, but I think the definition they use of ram pressure is practically the same as the one in Ayromlou+2019.

Thanks,

Pablo