GS263-02+45: Una nueva supercáscara de HI con evidencia de formación estelar

CORTI, M.A.; ARNAL, E.M.

Capilla del Monte, Córdoba, Argentina

Congreso; Reunión Anual de la Asociación Argentina de Astronomía; 2006

Asociación Argentina de Astronomía

Neutral hydrogen (H{\sc i}) supershells are among the mostspectacular phenomena that can be witnessed in the interstellar mediumof spiral galaxies. The H{\sc i} supershells are often identified as H{\sc i}brightness temperature minima surrounded by ``walls'' of H{\sc i} emission.In this work we present observational results that reveal the presenceof a new H{\sc i} supershell in a complex region of theMilky Way. Following the nomenclature accepted to designate these objets, the new H{\sc i} supershell has been identified as {\rm GS}263-02+45 andits diameter is of the order of 630 pc at a distance of $\sim$ 5 kpc.In this work we determined some of itsphysical characteristics  and correlate the large scale distribution of the H{\sc i} with the onecorresponding to the dust (MSX and IRAS databases). We discuss thepossibility that the OB associationhas been formed by the supershell some (2-7) $\times$ 10$^6$ years ago.