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Positive and Negative Feedback from the Supernova remnant IC443: first results from SHREC

<p>Supernova remnants (SNRs) drive large-scale&nbsp;shocks that locally enhance the density of&nbsp;the surrounding material but also inject vast&nbsp;amounts of energy and momentum that largely&nbsp;perturb and disperse the Interstellar Medium (ISM). The interplay between these two effects&nbsp;is considered paramount in regulating the star&nbsp;formation efficiency in galaxies. However, how&nbsp;SNRs affect the conditions of density and temperature&nbsp;of the ISM is not well constrained from&nbsp;an observational point of view. In this poster, I &nbsp;present our exploratory large single-dish&nbsp;observing program SHREC, aimed to observe&nbsp;the molecular shock tracer SiO(2-1) toward a&nbsp;sample of  30 SNRs known to be interacting&nbsp;with molecular clouds. I introduce the aim&nbsp;and technical aspects of SHREC and present&nbsp;the first results obtained toward the SNRs IC443. IC443 is a well known SNR, expanding into and&nbsp;interacting with a nearby toroidal molecular cloud. Toward the major site of interaction, known as&nbsp;clump G, we estimate the mass of the shocked gas to be 100 Msun. The shock driven by IC443&nbsp;into this material enhances its density by a factor &gt;10, to value consistent with those required to&nbsp;ignite star formation. Finally, we estimate that between 35-50% of the momentum injected by IC443&nbsp;is transferred to the nearby molecular material. Our work therefore indicates that the molecular ISM&nbsp;is an important carrier of the SNR momentum and that the SNR-molecular cloud interaction play a&nbsp;crucial role in the regulating star formation in galaxies.</p>