Molecular content of polar-ring galaxies

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[1] Combes, F.

[2] Moiseev, A.

[3] Reshetnikov, V.

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| 1600年 / EDP Sciences卷 / 554期

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We have searched for CO lines in a sample of 21 new morphologically determined polar-ring galaxies (of which nine are kinematically confirmed); obtained from a wide search in the Galaxy Zoo project by Moiseev and collaborators. Polar-ring galaxies (PRGs) are a unique class of objects; tracing special episodes in the galaxy mass assembly: they can be formed through galaxy interaction and merging; but also through accretion from cosmic filaments. Furthermore; they enable the study of dark matter haloes in three dimensions. The polar ring itself is a sub-system rich in gas; where molecular gas is expected; and new stars are formed. Among the sample of 21 PRGs; we have detected five CO-rich systems; that can now be followed up with higher spatial resolution. Their average molecular mass is 9.4 × 109M; and their average gas fraction is 27% of their baryonic mass; with a range from 15 to 43%; implying that they have just accreted a large amount of gas. The position of the detected objects in the velocity-magnitude diagram is offset from the Tully-Fisher relation of normal spirals; as was already found for PRGs. This work is part of our multi-wavelength project to determine the detailed morphology and dynamics of PRGs; test through numerical models their formation scenario; and deduce their dark matter content and 3D-shape. © 2013 ESO;

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