Detection of the 62 micron Crystalline Water Ice Feature in Emission toward HH7 with ISO-LWS

Simple item page
dc.creatorMolinari, Sergio
dc.creatorCeccarelli, Cecilia
dc.creatorWhite, Glenn
dc.creatorSaraceno, Paolo
dc.creatorNisini, Brunella
dc.creatorGiannini, Teresa
dc.creatorCaux, Emmanuel
dc.date1999-06-09
dc.date.accessioned2026-07-07T02:31:56Z
dc.date.available2026-07-07T02:31:56Z
dc.descriptionWe report the detection of the 62 micron feature of crystalline water ice in emission towards the bow-shaped Herbig-Haro object HH 7. Significant amounts of far infrared continuum emission are also detected between 10 and 200 micron, so that Herbig-Haro objects cease to be pure emission-line objects at FIR wavelengths. The formation of crystalline water ice mantles requires grain temperatures T > 100 K at the time of mantle formation, suggesting that we are seeing material processed by the HH 7 shock front. The deduced ice mass is \~2e-5 solar masses corresponding to a water column density N~ 1e18 cm-3; an estimate of the [H2O]/[H] abundance yields values close to the interstellar gas-phase oxygen abundance. The relatively high dust temperature and the copious amounts of gas-phase water needed to produce the observed quantity of crystalline water ice, suggest a scenario where both dissociative and non-dissociative shocks co-exist. The timescale for ice mantle formation is of the order of ~400 years, so that the importance of gas-phase water cooling as a shock diagnostic may be greatly diminished.
dc.descriptionto be published in Astrophysical Journal Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/9906167
dc.identifierhttp://arxiv.org/abs/astro-ph/9906167
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14338
dc.subjectAstrophysics
dc.titleDetection of the 62 micron Crystalline Water Ice Feature in Emission toward HH7 with ISO-LWS
dc.typetext

Files

Collections

arXiv