TUNA Lunch Talk:

Mark Walker

Manly Astrophysics

Solid hydrogen: interstellar dust

January 14

12:10PM, Room 230, NRAO, Edgemont Road


Solid hydrogen is a volatile material. In its pure form it would sublimate rapidly under typical interstellar conditions, so it is widely believed to be absent from the diffuse ISM. But dust particles acquire surface charges, and for H2 these charges greatly attenuate the sublimation rate. It now appears possible for hydrogen grains to survive in the diffuse ISM, so their presence or absence has become an observational issue. Is it possible that solid H2 is a major component of interstellar dust?