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Surface Brightness Measurements of Extended Galactic Nebulae

Published online by Cambridge University Press:  05 March 2013

Ronald Stark  and
Klaus Reif
Ronald Stark
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D–53121 Bonn, Germany; [email protected]
Klaus Reif
Affiliation:
Sternwarte, Universität Bonn, Auf dem Hügel 71, D–53121 Bonn, Germany
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Abstract

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We discuss the importance of digitised sky-limited Schmidt B- and R-band, and Hα images of extended translucent (AB ≃ 1–5 mag) and dark (AB > 5 mag) clouds. In translucent clouds (e.g. high-latitude cirrus) photons can penetrate through the whole cloud and control the physical and chemical processes. Comparison of the B images with far-infrared/submillimetre CO, CI, and CII emission provides important information on the non-homogeneous cloud structure, carbon chemistry and energy balance. In dark clouds the interior is completely shielded from the interstellar radiation field. L1204 is a dark cloud with at its edge the well-known HII rim S140. The R-band image shows S140 as well as the diffuse extended HII region around the exciting B-type star. However, the sensitivity for Hα in the R-band is rather low and there is contamination with diffusely scattered red light from dust. Deep Hα and R-band imaging of an ∼20′×20′ field has recently been done with the 1 m Hoher List telescope of Bonn University. A wealth of small-scale structures can been seen on continuum-subtracted images which provide new insight on the geometry of this cloud.

Keywords

ISM: cloudsdustindividual (cirrus, L1204/S140)reflection nebulae: structure
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 15 , Issue 1 , 1998 , pp. 86 - 90
Copyright
Copyright © Astronomical Society of Australia 1998

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