Physical association between the southern coalsack and chamaeleon-musca dark clouds

2008 ◽  
pp. 265-268
Author(s):  
J. B. Wagner Corradi ◽  
Gabriel A. P. Franco ◽  
Jens Knude
Keyword(s):  
Dark Clouds ◽  
Physical Association

scholarly journals Physical Association Between the Southern Coalsack and Chamaeleon-Musca Dark Clouds

1997 ◽  
Vol 166 ◽  
pp. 265-268
Author(s):  
J.B. Wagner Corradi ◽  
Gabriel A.P. Franco ◽  
Jens Knude
Keyword(s):  
Interstellar Dust ◽  
The Sun ◽  
Dark Clouds ◽  
Physical Association ◽  
Colour Excess ◽  
Local Loop

AbstractTo investigate a possible physical association between the Southern Coalsack and the Chamaeleon-Musca (SCCM) dark clouds we have obtained uubyβ photometry for 1017 stars covering the connecting area: 308° ≥ l ≥ 294° and –20° ≤ b ≤ 5°. Analysis of the various colour excess E(b – y) vs. distance diagrams has indicated the presence of a local low absorption volume limited at 150 ± 30 pc from the Sun by an extended interstellar dust sheet-like feature, that is followed by a region where almost no additional reddening is measured for the next 350 pc. Combined with other data on the local ISM the existence of the dust sheet at an identical distance of the SCCM dark clouds have suggested that these clouds could be higher density regions associated to the diffuse lane of dust of the Local-Loop I bubbles’ interface.

Physical association of moesin and CD46 as a receptor complex for measles virus.

1995 ◽  
Vol 69 (4) ◽  
pp. 2248-2256 ◽  
Author(s):  
J Schneider-Schaulies ◽  
L M Dunster ◽  
R Schwartz-Albiez ◽  
G Krohne ◽  
V ter Meulen
Keyword(s):  
Measles Virus ◽  
Receptor Complex ◽  
Physical Association

scholarly journals Physical association between Src homology 3 elements and the protein product of the c-cbl proto-oncogene

1994 ◽  
Vol 269 (26) ◽  
pp. 17363-17366 ◽  
Author(s):  
O.M. Rivero-Lezcano ◽  
J.H. Sameshima ◽  
A. Marcilla ◽  
K.C. Robbins
Keyword(s):  
Protein Product ◽  
Src Homology 3 ◽  
Physical Association ◽  
Src Homology

Polarimetric and photometric observations of CB54, with analysis of four other dark clouds

2021 ◽  
Vol 503 (4) ◽  
pp. 5274-5290
Author(s):  
A K Sen ◽  
V B Il’in ◽  
M S Prokopjeva ◽  
R Gupta
Keyword(s):  
Magnetic Field ◽  
Near Infrared ◽  
Galactic Plane ◽  
Photometric Data ◽  
Dust Particles ◽  
Dark Cloud ◽  
Dark Clouds ◽  
High Polarization ◽  
Field Parallel ◽  
Photometric Observations

ABSTRACT We present the results of our BVR-band photometric and R-band polarimetric observations of ∼40 stars in the periphery of the dark cloud CB54. From different photometric data, we estimate E(B − V) and E(J − H). After involving data from other sources, we discuss the extinction variations towards CB54. We reveal two main dust layers: a foreground, E(B − V) ≈ 0.1 mag, at ∼200 pc and an extended layer, $E(B-V) \gtrsim 0.3$ mag, at ∼1.5 kpc. CB54 belongs to the latter. Based on these results, we consider the reason for the random polarization map that we have observed for CB54. We find that the foreground is characterized by low polarization ($P \lesssim 0.5$ per cent) and a magnetic field parallel to the Galactic plane. The extended layer shows high polarization (P up to 5–7 per cent). We suggest that the field in this layer is nearly perpendicular to the Galactic plane and both layers are essentially inhomogeneous. This allows us to explain the randomness of polarization vectors around CB54 generally. The data – primarily observed by us in this work for CB54, by A. K. Sen and colleagues in previous works for three dark clouds CB3, CB25 and CB39, and by other authors for a region including the B1 cloud – are analysed to explore any correlation between polarization, the near-infrared, E(J − H), and optical, E(B − V), excesses, and the distance to the background stars. If polarization and extinction are caused by the same set of dust particles, we should expect good correlations. However, we find that, for all the clouds, the correlations are not strong.

scholarly journals The role of radiolysis in the modelling of C2H4O2 isomers and dimethyl ether in cold dark clouds

2020 ◽  
Vol 500 (3) ◽  
pp. 3414-3424
Author(s):  
Alec Paulive ◽  
Christopher N Shingledecker ◽  
Eric Herbst
Keyword(s):  
Gas Phase ◽  
Dimethyl Ether ◽  
Recent Observation ◽  
Cosmic Ray ◽  
Thermal Method ◽  
Dark Clouds ◽  
Ice Surface ◽  
Dust Grain ◽  
Complex Organic

ABSTRACT Complex organic molecules (COMs) have been detected in a variety of interstellar sources. The abundances of these COMs in warming sources can be explained by syntheses linked to increasing temperatures and densities, allowing quasi-thermal chemical reactions to occur rapidly enough to produce observable amounts of COMs, both in the gas phase, and upon dust grain ice mantles. The COMs produced on grains then become gaseous as the temperature increases sufficiently to allow their thermal desorption. The recent observation of gaseous COMs in cold sources has not been fully explained by these gas-phase and dust grain production routes. Radiolysis chemistry is a possible non-thermal method of producing COMs in cold dark clouds. This new method greatly increases the modelled abundance of selected COMs upon the ice surface and within the ice mantle due to excitation and ionization events from cosmic ray bombardment. We examine the effect of radiolysis on three C2H4O2 isomers – methyl formate (HCOOCH3), glycolaldehyde (HCOCH2OH), and acetic acid (CH3COOH) – and a chemically similar molecule, dimethyl ether (CH3OCH3), in cold dark clouds. We then compare our modelled gaseous abundances with observed abundances in TMC-1, L1689B, and B1-b.

HOT MOLECULAR CORES IN INFRARED DARK CLOUDS

2011 ◽  
Vol 741 (2) ◽  
pp. 120 ◽  
Author(s):  
J. M. Rathborne ◽  
G. Garay ◽  
J. M. Jackson ◽  
S. Longmore ◽  
Q. Zhang ◽  
...  
Keyword(s):  
Dark Clouds ◽  
Infrared Dark Clouds

Trends in scientific publishing: Dark clouds loom large

2016 ◽  
Vol 363 ◽  
pp. 119-120 ◽  
Author(s):  
Pulikottil Wilson Vinny ◽  
Venugopalan Y. Vishnu ◽  
Vivek Lal
Keyword(s):  
Scientific Publishing ◽  
Dark Clouds

scholarly journals Diffuse interstellar bands in the Taurus dark clouds

1991 ◽  
Vol 252 (2) ◽  
pp. 234-245 ◽  
Author(s):  
A. J. Adamson ◽  
D. C. B. Whittet ◽  
W. W. Duley
Keyword(s):  
Dark Clouds ◽  
Diffuse Interstellar Bands
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