Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...501l.105l&link_type=abstract
Astrophysical Journal Letters v.501, p.L105
Astronomy and Astrophysics
Astronomy
73
Ism: Abundances, Ism: Clouds, Ism: Molecules, Infrared: Ism: Lines And Bands, Comets: General
Scientific paper
We present infrared spectra of four embedded protostars in the 750-1230 cm-1 (13.3-8.1 mu m) range. For NGC 7538 IRS 9, a new band is reported at 1110 cm-1 (9.01 mu m), and several others may be present near 785, 820, 900, 1030, and 1075 cm-1 (12.7, 12.2, 11.1, 9.71, and 9.30 mu m). The band at 1110 cm-1 is attributed to frozen NH3. Its position and width imply that the NH3 is frozen in a polar, H2O-rich interstellar ice component. The NH3/H2O ice ratio inferred for NGC 7538 IRS 9 is 0.1, making NH3 as important a component as CH3OH and CO2 in the polar ices along this line of sight. At these concentrations, hydrogen bonding between the NH3 and H2O can account for much of the enigmatic low-frequency wing on the 3240 cm-1 (3.09 mu m) H2O interstellar ice band. The strength of the implied NH3 deformation fundamental at 1624 cm-1 (6.158 mu m) can also account for the absorption at this position reported by ISO.
Allamandola Louis J.
Faraji H.
Lacy John H.
Sandford Scott A.
No associations
LandOfFree
Unraveling the 10 Micron "Silicate" Feature of Protostars: The Detection of Frozen Interstellar Ammonia 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 Unraveling the 10 Micron "Silicate" Feature of Protostars: The Detection of Frozen Interstellar Ammonia, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Unraveling the 10 Micron "Silicate" Feature of Protostars: The Detection of Frozen Interstellar Ammonia will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1343079