Hidden low-velocity radiative shocks — Stavros Akras (ON/MCTIC)
21 de junho: 12:30 - 17:00
Forbidden lines with a low ionization potential like [S II] λλ6716,6731, [N II] λλ6548,6584, [O II] λ3727, [O I] λλ6300,6363 and [N I] λ5200 are usually strong indicator of shock interactions in different ionized environments such as AGNs, SNRs, PNe, Harbig-Haro objects, jets, etc. The common characteristic in all these cases is the high velocity (>150-200 km/s) of shocks. Recent studies on planetary nebulae have revealed that low-velocity (<100-150 km/s) shocks are always present and are more important than we thought. However, they are not taken them into consideration. In this talk, I will describe recent progress in the field and the effect of low-velocity shocks on the ionization structure in planetary nebulae.