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

ARNAL, EDMUNDO MARCELO; CORTI, MARIELA ALEJANDRA

ASTRONOMY AND ASTROPHYSICS

EDPSciences, Les Ulis, France, on behalf og the Board of Directors

Año: 2007 vol. 476 p. 255 - 261

0004-6361

We look for galactic neutral hydrogen (HI) supershells likely to be associated with massive star groupings. A neutral hydrogen (HI) line survey carried out at the Instituto Argentino de Radioastronomia (IAR) and the Southern Galactic Plane Survey (SGPS) were the main databases used in this investigation.A new HI supershell (GS263-02+45) was found in the outer part of the Galaxy. This structure is located at a distance of 5.3 (+-) 1 kpc from the Sun and has a linear diameter of about 665 (+-) 40 pc. The expansion velocity of the supershell is 14 km/seg.The total amount of atomic gas related to GS263-02+45 is 2x10e(6) Masas solares. Based on the analysis of the SGPS HI data it is 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.