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We analyze star formation (SF) as a function of stellar mass (M*) andredshift z in the All Wavelength Extended Groth Strip International Survey(AEGIS). For 2905 field galaxies, complete to 10^10(10^10.8) Msun at z<0.7(1),with Keck spectroscopic redshifts out to z=1.1, we compile SF rates (SFR) fromemission lines, GALEX, and Spitzer MIPS 24 micron photometry, optical-NIR M*measurements, and HST morphologies. Galaxies with reliable signs of SF form adistinct "main sequence (MS)", with a limited range of SFR at a given M* and z(1 sigma < +-0.3 dex), and log(SFR) approximately proportional to log(M*). Therange of log(SFR) remains constant to z>1, while the MS as a whole moves tohigher SFR as z increases. The range of SFR along the MS constrains theamplitude of episodic variations of SF, and the effect of mergers on SFR.Typical galaxies spend ~67(95)% of their lifetime since z=1 within a factor of<~ 2(4) of their average SFR at a given M* and z. The dominant mode of theevolution of SF since z~1 is apparently a gradual decline of the average SFR inmost individual galaxies, not a decreasing frequency of starburst episodes, ora decreasing factor by which SFR are enhanced in starbursts. LIRGs at z~1 seemto mostly reflect the high SFR typical for massive galaxies at that epoch. Thesmooth MS may reflect that the same set of few physical processes governs starformation prior to additional quenching processes. A gradual process like gasexhaustion may play a dominant role.Comment: 5 pages, 1 figure, emulateapj; ApJ Letters, accepted; AEGIS special  issue; proof-level corrections added; title change

the astrophysical journal

Star Formation in AEGIS Field Galaxies since <i>z</i> = 1.1: The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-forming Galaxies

Star Formation in AEGIS Field Galaxies since z = 1.1: The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-forming Galaxies