I wonder why most of the gas cells in massive( >10^{10.5} M_{sun} ) galaxies in TNG300-1 have negative cooling rate (i.e. having negative GFM_CoolingRate values )? If this situation is true, then how can I interpret this negative rate ? should I just ignore the gas cells with negative rate when estimating the average cooling time for the massive galaxies?
Best regards,
Yingzhong
Dylan Nelson
21 Apr '21
Hello Yingzhong,
These are always "net" cooling rates, so a negative value means actually heating by that amount.
I imagine this is a very small subset of gas? If so, I would suggest indeed to calculate a "cooling time" only for gas which is actually cooling. Although, it depends ultimately on what you will use this value for.
hello,
I wonder why most of the gas cells in massive( >10^{10.5} M_{sun} ) galaxies in TNG300-1 have negative cooling rate (i.e. having negative GFM_CoolingRate values )? If this situation is true, then how can I interpret this negative rate ? should I just ignore the gas cells with negative rate when estimating the average cooling time for the massive galaxies?
Best regards,
Yingzhong
Hello Yingzhong,
These are always "net" cooling rates, so a negative value means actually heating by that amount.
I imagine this is a very small subset of gas? If so, I would suggest indeed to calculate a "cooling time" only for gas which is actually cooling. Although, it depends ultimately on what you will use this value for.
Thank you Dylan, very helpful