Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-31
Astrophys.J.588:L37-L40,2003
Astronomy and Astrophysics
Astrophysics
13 pages, 4 figures, accepted for publication by ApJ Letters
Scientific paper
10.1086/375524
The G11.11-0.12 Infrared-Dark Cloud has a filamentary appearance, both in absorption against the diffuse 8micron Galactic background, and in emission from cold dust at 850micron. Detailed comparison of the dust properties at these two wavelengths reveals that standard models for the diffuse interstellar dust in the Galaxy are not consistent with the observations. The ratio of absorption coefficients within the cloud is kappa_8/kappa_850 <= 1010, which is well below that expected for the diffuse ISM where kappa_8/kappa_850 ~ 1700. This may be due to the formation of ice mantles on the dust and grain coagulation, both of which are expected within dense regions of molecular clouds. The 850micron emission probes the underlying radial structure of the filament. The profile is well represented by a marginally resolved central region and a steeply falling envelope, with Sigma(r) proportional to r^(-a), where a <= 3, indicating that G11.11-0.12 is the first observed filament with a profile similar to that of a non-magnetic isothermal cylinder.
Carey Sean Joseph
Feldman Paul A.
Fiege Jason
Johnstone Doug
Redman Russell Ormond
No associations
LandOfFree
The G11.11-0.12 Infrared-Dark Cloud: Anomalous Dust and a Non-Magnetic Isothermal Model 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 The G11.11-0.12 Infrared-Dark Cloud: Anomalous Dust and a Non-Magnetic Isothermal Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The G11.11-0.12 Infrared-Dark Cloud: Anomalous Dust and a Non-Magnetic Isothermal Model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-102212