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We have used the Giant Metrewave Radio Telescope (GMRT) to carry out deep 610MHz continuum imaging of four sub-fields of the DEEP2 Galaxy Redshift Survey.We stacked the radio emission in the GMRT images from a near-complete (absoluteblue magnitude ${\rm M_B} \leq -21$) sample of 3698 blue star-forming galaxieswith redshifts $0.7 \lesssim z \lesssim 1.45$ to detect (at $\approx 17\sigma$significance) the median rest-frame 1.4 GHz radio continuum emission of thesample galaxies. The stacked emission is unresolved, with a rest-frame 1.4 GHzluminosity of $\rm L_{1.4 \; GHz} = (4.13 \pm 0.24) \times 10^{22}$ WHz$^{-1}$. We used the local relation between total star formation rate (SFR)and 1.4 GHz luminosity to infer a median total SFR of $\rm (24.4 \pm 1.4)\;M_\odot$ yr$^{-1}$ for blue star-forming galaxies with $\rm M_B \leq -21$ at$0.7 \lesssim z \lesssim 1.45$. We detect the main-sequence relation betweenSFR and stellar mass, $\rm M_\star$, obtaining $\rm SFR = (13.4 \pm 1.8) \times[(M_{\star}/(10^{10} \;M_\odot)]^{0.73 \pm 0.09} \; M_\odot \; yr^{-1}$; thepower-law index shows no change over $z \approx 0.7 - 1.45$. We find that thenebular line emission suffers less extinction than the stellar continuum,contrary to the situation in the local Universe; the ratio of nebularextinction to stellar extinction increases with decreasing redshift. We obtainan upper limit of 0.87 Gyr to the atomic gas depletion time of a sub-sample ofthe DEEP2 galaxies at $z \approx 1.3$; neutral atomic gas thus appears to be atransient phase in high-$z$ star-forming galaxies.

Probing star formation in galaxies at $z \approx 1$ via a Giant Metrewave Radio Telescope stacking analysis