Surface brightness measurements of
extended galactic nebulae

Ronald Stark , Klaus Reif, PASA, 15 (1), 86
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Surface brightness measurements of
extended galactic nebulae

Ronald Stark tex2html_wrap_inline148
Klaus Reif tex2html_wrap_inline150

tex2html_wrap_inline148 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
tex2html_wrap_inline150 Sternwarte, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany


We discuss the importance of digitised sky-limited Schmidt B- and R-band, and Htex2html_wrap_inline160 images of extended translucent (tex2html_wrap_inline162 mag) and dark (tex2html_wrap_inline164 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, [C tex2html_wrap_inline168], and [C tex2html_wrap_inline170] 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 H tex2html_wrap_inline170 rim S140. The R-band image shows S140 as well as the diffuse extended H tex2html_wrap_inline170 region around the exciting B-type star. However, the sensitivity for Htex2html_wrap_inline160 in the R-band is rather low and there is contamination with diffusely scattered red light from dust. Deep Htex2html_wrap_inline160 and R-band imaging of an tex2html_wrap_inline186 field has recently been done with the 1m 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: clouds, dust, individual (cirrus, S140/L1204), reflection nebulae, structure

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