Ice absorption features in the 5-8 μm region toward embedded protostars

Details Ice absorption features in the 5-8 μm region toward embedded protostars Ice absorption features in the 5-8 μm region toward embedded protostars

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376..254k&link_type=abstract

Astronomy and Astrophysics, v.376, p.254-270 (2001)

Astronomy and Astrophysics

Astrophysics

112

Ism: Dust, Extinction, Ism: Molecules, Ism: Abundances, Infrared: Ism, Stars: Formation

Scientific paper

We have obtained 5-8 μm spectra towards 10~embedded protostars using the Short Wavelength Spectrometer on board the Infrared Space Observatory (ISO-SWS) with the aim of studying the composition of interstellar ices. The spectra are dominated by absorption bands at 6.0 μm and 6.85 μm. The observed peak positions, widths and relative intensities of these bands vary dramatically along the different lines of sight. On the basis of comparison with laboratory spectra, the bulk of the 6.0 μm absorption band is assigned to amorphous H2O ice. Additional absorption, in this band, is seen toward 5 sources on the short wavelength wing, near 5.8 μm, and the long wavelength side near 6.2 μm. We attribute the short wavelength absorption to a combination of formic acid (HCOOH) and formaldehyde (H2CO), while the long wavelength absorption has been assigned to the C-C stretching mode of aromatic structures. From an analysis of the 6.85 μm band, we conclude that this band is composed of two components: a volatile component centered near 6.75 μm and a more refractory component at 6.95 μm. From a comparison with various temperature tracers of the thermal history of interstellar ices, we conclude that the two 6.85 μm components are related through thermal processing. We explore several possible carriers of the 6.85 μm absorption band, but no satisfactory identification can be made at present. Finally, we discuss the possible implications for the origin and evolution of interstellar ices that arise from these new results. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.

Affiliated with

Also associated with

No associations

Rating

Ice absorption features in the 5-8 μm region toward embedded protostars 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 Ice absorption features in the 5-8 μm region toward embedded protostars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ice absorption features in the 5-8 μm region toward embedded protostars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1483561