Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...476..255a&link_type=abstract
Astronomy and Astrophysics, Volume 476, Issue 1, December II 2007, pp.255-261
Astronomy and Astrophysics
Astrophysics
3
Galaxy: Kinematics And Dynamics, Galaxy: Structure, Ism: Bubbles, Ism: Structure, Radio Lines: Ism
Scientific paper
Aims:We look for galactic neutral hydrogen (Hi) supershells likely to be associated with massive star groupings. Methods: A neutral hydrogen (Hi) line survey 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 (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 s-1. The total amount of atomic gas related to GS263-02+45 is ~2 × 106 M_&sun;. 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.
Arnal Marcelo E.
Corti Mariela
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