Surface brightness measurements of extended galactic nebulae

Details Surface brightness measurements of extended galactic nebulae Surface brightness measurements of extended galactic nebulae

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasa...15...86s&link_type=abstract

Publications Astronomical Society of Australia, vol. 15, no. 1, p. 86-90

Astronomy and Astrophysics

Astronomy

Interstellar Medium, Clouds, Dust, Reflection Nebulae

Scientific paper

We discuss the importance of digitized sky-limited Schmidt B- and R-band, and H-alpha images of extended translucent (A_B approx. 1 - 5 mag) and dark (A_B greater than 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 H-alpha in the R-band is rather low and there is contamination with diffusely scattered red light from dust. Deep H-alpha and R-band imaging of an approx. 20' x 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.

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