Constraining axion and compact dark matter with interstellar medium heating

Cold interstellar gas systems have been used to constrain dark matter (DM) models by the condition that heating rate from DM must be lower than astrophysical cooling of gas. Following methodology Wadekar and Farrar (2021), we use medium a gas-rich dwarf galaxy, Leo T, Milky Way-environment cloud, G33.4-8.0 DM. T is particularly strong system as its can lowest among all objects in late Universe (owing low volume density metallicity gas). Way clouds, some cases, provide complementary limits DM-gas relative velocity them much larger T. We derive constraints on following scenarios which heat gas: $(i)$ interaction axions with hydrogen atoms or free electrons gas, $(ii)$ deceleration relic magnetically charged plasma, $(iii)$ dynamical friction compact DM, $(iv)$ hard sphere scattering composite Our are direct detection searches. Detection more low-mass dwarfs like upcoming 21cm optical surveys improve our bounds.