Detection of the 62 Micron Crystalline H_2O Ice Feature in Emission toward HH 7 with the Infrared Space Observatory Long-Wavelength Spectrometer

Details Detection of the 62 Micron Crystalline H_2O Ice Feature in Emission toward HH 7 with the Infrared Space Observatory Long-Wavelength Spectrometer Detection of the 62 Micron Crystalline H_2O Ice Feature in Emission toward HH 7 with the Infrared Space Observatory Long-Wavelength Spectrometer

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...521l..71m&link_type=abstract

The Astrophysical Journal, Volume 521, Issue 1, pp. L71-L74.

Astronomy and Astrophysics

Astronomy

15

Ism: Dust, Extinction, Infrared: Ism: Continuum, Infrared: Ism: Lines And Bands, Ism: Herbig-Haro Objects, Ism: Individual: Alphanumeric: Hh 7, Ism: Lines And Bands

Scientific paper

We report the detection of the 62 μm feature of crystalline water ice in emission toward the bow-shaped Herbig-Haro object HH 7. Significant amounts of far-infrared continuum emission are also detected between 10 and 200 mum, so that Herbig-Haro objects cease to be pure emission-line objects at far-infrared wavelengths. The formation of crystalline water ice mantles requires grain temperatures T_gr>~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 ~2x10^-5 M_solar, corresponding to a water column density N(H_2O)~10^18 cm^-2 an estimate of the [H_2O]/[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 in which both dissociative and nondissociative shocks coexist. The timescale for ice mantle formation is of the order of ~400 yr, so that the importance of gas-phase water cooling as a shock diagnostic may be greatly diminished.

Affiliated with

Also associated with

No associations

Rating

Detection of the 62 Micron Crystalline H_2O Ice Feature in Emission toward HH 7 with the Infrared Space Observatory Long-Wavelength Spectrometer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Detection of the 62 Micron Crystalline H_2O Ice Feature in Emission toward HH 7 with the Infrared Space Observatory Long-Wavelength Spectrometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of the 62 Micron Crystalline H_2O Ice Feature in Emission toward HH 7 with the Infrared Space Observatory Long-Wavelength Spectrometer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1456515