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

Published online by Cambridge University Press:  12 April 2016

J.B. Wagner Corradi ,
Gabriel A.P. Franco  and
Jens Knude
J.B. Wagner Corradi
Affiliation:
Departamento de Física - ICEx - UFMG, Caixa Postal 702, 30161-970, Belo Horizonte - MG, Brazil Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, DK 2100, Copenhagen Ø, Denmark
Gabriel A.P. Franco
Affiliation:
Departamento de Física - ICEx - UFMG, Caixa Postal 702, 30161-970, Belo Horizonte - MG, Brazil
Jens Knude
Affiliation:
Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, DK 2100, Copenhagen Ø, Denmark

Abstract

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To 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.

Type
Part V Magnetic Fields, Molecular Clouds, and Interstellar Bubbles
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 265 - 268
Copyright
Copyright © Springer-Verlag 1998

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