2006A&A...458..163T

We look for radio-continuum and atomic neutral hydrogen (HI) counterparts of the IRAS Vela shell (IVS).Neutral hydrogen (HI) and 1410MHz radio continuum surveys carried out with the Instituto Argentino de Radioastronomia (IAR) dishes are the main databases used in this investigation. A good morphological correlation was found between arc-shaped structures at radio wavelengths and in the 100µm IR emission. This correlation is observed at velocities of the HI between -17.5 and -2.1km/s, in agreement with the velocities of the molecular gas detected in the region. The radial distribution of the different components is consistent with the presence of an expanding shell that is being ionized from inside. Assuming a distance of 400pc, the amount of ionized and atomic gas associated with the IVS is 2.3x10⁴ and 6.8x10⁴ solar masses, respectively. The origin of the expansion of the IVS could not be identified.