2003ApJ...588L..37J


Query : 2003ApJ...588L..37J

2003ApJ...588L..37J - Astrophys. J., 588, L37-L40 (2003/May-1)

The G11.11-0.12 infrared-dark cloud: anomalous dust and a nonmagnetic isothermal model.

JOHNSTONE D., FIEGE J.D., REDMAN R.O., FELDMAN P.A. and CAREY S.J.

Abstract (from CDS):

The G11.11-0.12 infrared-dark cloud has a filamentary appearance, both in absorption against the diffuse 8 µm Galactic background and in emission from cold dust at 850 µm. A 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 κ8850≤1010, which is well below that expected for the diffuse interstellar medium where κ8850∼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 850 µm 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 Σ(r)∝r–α, where α≥3, indicating that G11.11-0.12 is the first observed filament with a profile similar to that of a nonmagnetic isothermal cylinder.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - ISM: Clouds - ISM: Evolution - ISM: Individual: Alphanumeric: G11.11-0.12 - ISM: Structure

Nomenclature: Fig.2: [CFR2000] G11.11-0.12 PN (Nos P2-P7) added.

CDS comments: Parag. 3 : L97 in Cygnus is a misprint for L977 (= LDN 977)

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4412 0
2 M 42 HII 05 35 17 -05 23.4           ~ 4071 0
3 NAME Ori A MoC 05 38 -07.1           ~ 3007 0
4 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1153 1
5 MMB G011.109-00.114 Y*O 18 10 28.25 -19 22 29.1           ~ 56 0
6 [CCE98b] 011.11-0.12 Cld 18 10.5 -19 23           ~ 99 2
7 LDN 977 DNe 21 39.0 +43 14           ~ 38 0
8 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 466 2
9 [PWC2006] NH3 G11.11-0.12 P2 smm ~ ~           ~ 4 0
10 [CFR2000] G011.11-0.12 P7 smm ~ ~           ~ 2 0
11 [CFR2000] G011.11-0.12 P6 smm ~ ~           ~ 7 0
12 [CFR2000] G011.11-0.12 P5 smm ~ ~           ~ 1 0
13 [PWC2006] NH3 G11.11-0.12 P4 smm ~ ~           ~ 3 0
14 [PWC2006] NH3 G11.11-0.12 P3 smm ~ ~           ~ 4 0

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