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To reveal natures of the dark matter (DM) particles, a gamma-ray signalproduced in annihilation processes of DM into the standard model particles hasbeen one of the major probes. The cross-correlation between highly DM dominatedstructures, such as local dwarf galaxies, and observed photons in the directionof the structures, has been explored and provided stringent constraints on theannihilation rate. In our previous work, we have shown that it is sufficient toknow the distance distribution of the galaxy sample and individual distancemeasurement is not required for constraining the annihilation rate. In thiswork, we apply the method to low-surface brightness galaxies (LSBGs) withunknown individual redshifts provided from the Dark Energy Survey (DES) Year 3data. With all DES-LSBGs of about 24,000 objects, we find that the upper limitsof the cross section for bb channel with 95% C.L. is 3*10^-25 cm^3/s at DM massof 100 GeV. To be more conservative, we remove about 7000 LSBGs within 1 degreefrom resolved gamma-ray point sources and then the constraint becomes 30 %weaker than the one with all samples in all DM mass ranges.

Constraining Dark matter annihilation with Dark Energy Survey Y3 LSBG sample