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Titolo:
Ice absorption features in the 5-8 mu m region toward embedded protostars
Autore:
Keane, JV; Tielens, AGGM; Boogert, ACA; Schutte, WA; Whittet, DCB;
Indirizzi:
Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands Kapteyn Astron Inst Groningen Netherlands NL-9700 AV ningen, Netherlands SRON, NL-9700 AV Groningen, Netherlands SRON Groningen Netherlands NL-9700 AV NL-9700 AV Groningen, Netherlands CALTECH, Pasadena, CA 91125 USA CALTECH Pasadena CA USA 91125CALTECH, Pasadena, CA 91125 USA Leiden Observ, NL-2300 RA Leiden, Netherlands Leiden Observ Leiden Netherlands NL-2300 RA -2300 RA Leiden, Netherlands Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USARensselaer Polytech Inst Troy NY USA 12180 s & Astron, Troy, NY 12180 USA
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 1, volume: 376, anno: 2001,
pagine: 254 - 270
SICI:
1432-0746(200109)376:1<254:IAFIT5>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
DENSE MOLECULAR CLOUDS; TIME-DEPENDENT CHEMISTRY; ISO-SWS OBSERVATIONS; MU-M ABSORPTION; INFRARED-SPECTROSCOPY; H2O ICE; MICRON SPECTRA; SOLID-STATE; MONOCEROS R2/IRS-3; ORGANIC-MOLECULES;
Keywords:
ISM : dust, extinction; ISM : molecules; ISM : abundances; infrared : ISM; stars : formation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
75
Recensione:
Indirizzi per estratti:
Indirizzo: Keane, JV Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands Kapteyn Astron Inst POB 800 Groningen Netherlands NL-9700 AV ds
Citazione:
J.V. Keane et al., "Ice absorption features in the 5-8 mu m region toward embedded protostars", ASTRON ASTR, 376(1), 2001, pp. 254-270

Abstract

We have obtained 5-8 mum 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 mum and 6.85 mum. The observed peak positions, widths and relative intensities of these bands vary dramatically along the different lines of sight. On the basis of comparison withlaboratory spectra, the bulk of the 6.0 mum absorption band is assigned toamorphous H2O ice. Additional absorption, in this band, is seen toward 5 sources on the short wavelength wing, near 5.8 mum, and the long wavelength side near 6.2 mum. 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 mum band, we conclude that this bandis composed of two components: a volatile component centered near 6.75 mumand a more refractory component at 6.95 mum. From a comparison with various temperature tracers of the thermal history of interstellar ices, we conclude that the two 6.85 mum components are related through thermal processing. We explore several possible carriers of the 6.85 mum absorption band, butno satisfactory identification can be made at present. Finally, we discussthe possible implications for the origin and evolution of interstellar ices that arise from these new results.

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Documento generato il 04/12/20 alle ore 13:27:37