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We present direct constraints on galaxy intrinsic alignments using the DarkEnergy Survey Year 3 (DES Y3), the Extended Baryon Oscillation SpectroscopicSurvey (eBOSS) and its precursor, the Baryon Oscillation Spectroscopic Survey(BOSS). Our measurements incorporate photometric red sequence (redMaGiC)galaxies from DES with median redshift $z\sim0.2-1.0$, luminous red galaxies(LRGs) from eBOSS at $z\sim0.8$, and also a SDSS-III BOSS CMASS sample at$z\sim0.5$. We measure two point intrinsic alignment correlations, which we fitusing a model that includes lensing, magnification and photometric redshifterror. Fitting on scales $6<r_{\rm p} < 70$ Mpc$/h$, we make a detection ofintrinsic alignments in each sample, at $5\sigma-22\sigma$ (assuming a simpleone parameter model for IAs). Using these red samples, we measure theIA-luminosity relation. Our results are statistically consistent with previousresults, but offer a significant improvement in constraining power,particularly at low luminosity. With this improved precision, we see detectabledependence on colour between broadly defined red samples. It is likely that amore sophisticated approach than a binary red/blue split, which jointlyconsiders colour and luminosity dependence in the IA signal, will be needed infuture. We also compare the various signal components at the best fitting pointin parameter space for each sample, and find that magnification and lensingcontribute $\sim2-18\%$ of the total signal. As precision continues to improve,it will certainly be necessary to account for these effects in future direct IAmeasurements. Finally, we make equivalent measurements on a sample of EmissionLine Galaxies (ELGs) from eBOSS at $z\sim 0.8$. We report a null detection,constraining the IA amplitude (assuming the nonlinear alignment model) to be$A_1=0.07^{+0.32}_{-0.42}$ ($|A_1|<0.78$ at $95\%$ CL).

The Dark Energy Survey Year 3 and eBOSS: constraining galaxy intrinsic alignments across luminosity and colour space