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Massive compact systems at 0.2<z<0.6 are the missing link between thepredominantly compact population of massive quiescent galaxies at high redshiftand their analogs and relics in the local volume. The evolution in numberdensity of these extreme objects over cosmic time is the crucial constrainingfactor for the models of massive galaxy assembly. We select a large sample of~200 intermediate-redshift massive compacts from the BOSS spectroscopic datasetby identifying point-like SDSS photometric sources with spectroscopicsignatures of evolved redshifted galaxies. A subset of our targets havepublicly available high-resolution ground-based images that we use to augmentthe dynamical and stellar population properties of these systems by theirstructural parameters. We confirm that all BOSS compact candidates are ascompact as their high-redshift massive counterparts and less than half the sizeof similarly massive systems at z~0. We use the completeness-corrected numbersof BOSS compacts to compute lower limits on their number densities in narrowredshift bins spanning the range of our sample. The abundance of extremelydense quiescent galaxies at 0.2<z<0.6 is in excellent agreement with the numberdensities of these systems at high redshift. Our lower limits support themodels of massive galaxy assembly through a series of minor mergers over theredshift range 0<z<2.

The Number Density of Quiescent Compact Galaxies at Intermediate Redshift