The Filamentary Structure of the Lupus 3 Molecular Cloud

We present the column density map of the Lupus 3 molecular cloud derived from the Herschel photometric maps. We compared the Herschel continuum maps, tracing the dense and cold dust emission, with the CS (2-1) map observed with the Mopra 22-m antenna, tracing the dense gas. Both the continuum and the CS maps show a well defined filamentary structure, with most of the dense cores being on the filaments. The CS (2-1) line shows a double peak in the central part of the longest filament due to the presence of two distinct gas components along this line of sight. Therefore, what seems a single filament in the Herschel map is actually the overlap of two kinematically distinct filaments. This case clearly shows that kinematical information is essential for the correct interpretation of filaments in molecular clouds.