Molecular gas in high-mass filament WB673
Paper in proceedings, 2017

We studied the distribution of dense gas in a filamentary molecular cloud containing several dense clumps. The center of the filament is given by the dense clump WB673. The clumps are high-mass and intermediate-mass starforming regions. We observed CS (2-1), 13CO (1-0), C18O(1-0), and methanol lines at 96 GHz toward WB673 with the Onsala Space Observatory 20-m telescope. We found CS (2-1) emission in the inter-clump medium so the clumps are physically connected and the whole cloud is indeed a filament. Its total mass is 104 M⊙ and mass-to-length ratio is 360M⊙ pc−1 from 13CO (1-0) data. Mass-to-length ratio for the dense gas is 3.4 − 34M⊙ pc−1 from CS (2-1) data. The PV-diagram of the filament is V-shaped. We estimated physical conditions in the molecular gas using methanol lines. Location of the filament on the sky between extended shells suggests that it could be a good example to test theoretical models of formation of the filaments via multiple compression of interstellar gas by supersonic waves.

massive stars

star formation

H ɪɪ regions



Maria S. Kirsanova

Svetlana V. Salii

Andrej M. Sobolev

Henrik Olofsson

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Dmitry A. Ladeyschikov

Magnus Thomasson

Astronomy and Plasmaphysics

Open Astronomy

2543-6376 (eISSN)

Vol. 26 1 99-105

Subject Categories

Astronomy, Astrophysics and Cosmology


Basic sciences


Onsala Space Observatory



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