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To measure the supernova (SN) rates at intermediate redshift we performed theSouthern inTermediate Redshift ESO Supernova Search (STRESS). Unlike most ofthe current high redshift SN searches, this survey was specifically designed toestimate the rate for both type Ia and core collapse (CC) SNe. We counted theSNe discovered in a selected galaxy sample measuring SN rate per unit blue bandluminosity. Our analysis is based on a sample of ~43000 galaxies and on 25spectroscopically confirmed SNe plus 64 selected SN candidates. Our approach isaimed at obtaining a direct comparison of the high redshift and local rates andat investigating the dependence of the rates on specific galaxy properties,most notably their colour. The type Ia SN rate, at mean redshift z=0.3, amountsto 0.22^{+0.10+0.16}_{-0.08 -0.14} h_{70}^2 SNu, while the CC SN rate, atz=0.21, is 0.82^{+0.31 +0.30}_{-0.24 -0.26} h_{70}^2 SNu. The quoted errors arethe statistical and systematic uncertainties. With respect to local value, theCC SN rate at z=0.2 is higher by a factor of ~2 already at redshift, whereasthe type Ia SN rate remains almost constant. This implies that a significantfraction of SN Ia progenitors has a lifetime longer than 2-3 Gyr. We alsomeasured the SN rates in the red and blue galaxies and found that the SN Iarate seems to be constant in galaxies of different colour, whereas the CC SNrate seems to peak in blue galaxies, as in the local Universe. SN rates perunit volume were found to be consistent with other measurements showing asteeper evolution with redshift for CC SNe with respect to SNe Ia. Finally wehave exploited the link between star formation (SF) and SN rates to predict theevolutionary behaviour of the SN rates and compare it with the path indicatedby observations.

Supernova rates from the Southern inTermediate Redshift ESO Supernova Search (STRESS)