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• W2045404721 endingPage "95" @default.
• W2045404721 startingPage "95" @default.
• W2045404721 abstract "Using our continuity approach, we explore the underlying connections between the evolution of the faint-end slope αs of the stellar mass function of star-forming galaxies, the logarithmic slope β of the specific star formation rate (sSFR)–mass relation, and the merging of galaxies. We derive analytically the consequences of the observed constancy of αs since redshifts of at least z ∼ 2. If the logarithmic slope β of the sSFR–mass relation is negative, then the faint-end slope αs should quickly diverge due to the differential mass increase of galaxies on the star-forming main sequence, and this will also quickly destroy the Schechter form of the mass function. This problem can be solved by removing low-mass galaxies by merging them into more massive galaxies. We quantify this process by introducing the specific merger mass rate (sMMR) as the specific rate of mass added to a given galaxy through mergers. For a modest negative value of β ∼ −0.1, an average sMMR ∼ 0.1 sSFR across the population is required to keep αs constant with epoch, as observed. This in turn implies a merger rate of ∼0.2 sSFR for major mergers, which is consistent with the available observational estimates. More negative values of β require higher sMMR and higher merger rates, and the steepening of the mass function becomes impossible to control for β < −(αs + 2). The close link that is required between the in situ sSFR and the sMMR probably arises because both are closely linked to the buildup of dark matter halos. These new findings further develop the formalism for the evolving galaxy population that we introduced earlier and show how striking symmetries in the galaxy population can emerge as the result of deep links between the physical processes involved." @default.
• W2045404721 created "2016-06-24" @default.
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• W2045404721 date "2014-07-09" @default.
• W2045404721 modified "2023-09-24" @default.
• W2045404721 title "MASS AND ENVIRONMENT AS DRIVERS OF GALAXY EVOLUTION. III. THE CONSTANCY OF THE FAINT-END SLOPE AND THE MERGING OF GALAXIES" @default.
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• W2045404721 doi "https://doi.org/10.1088/0004-637x/790/2/95" @default.
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