GS263-02+45 : a new HI supershell with evidence of having triggered star formation?

E. Marcelo Arnal, Mariela Corti.

Serie: Trabajos publicados del IAR ; no. 798

Resumen: Aims: we look for the galactic neutral hydrogen (HI) supershells likely to be associated with massive star groupings. Methods: a neutral hydrogen (HI) linesurvey carried out at the Instituto Argentino de Radioastronomía (IAR) and the Southern Galactic Plane Survey (SGPS) were the main databases used in this investigation. Results: a new HI supershell (G263-02+45) was found in the outer part of the Galaxy. This structure is located at a distance of 5.3 ñ 1 kpc from the Sun and has a linear diameter of about 665 ñ 40 pc. The expantion velocity of the supershell is ~ 14 km s. 1. The total amount of atomic gas related to GS263-02+45 is ~ 2X10. M. Based on the analysis of the SGPS HI data it concluded that the OB-association Bochum 7 is likely to be interacting with GS263-02+45. This fact together with distance and age arguments may indicate that Bochum 7 was born as a consequence of the evolution of GS263-02+45.