Article

EVOLUTION OF INTRINSIC SCATTER IN THE SFR–STELLAR MASS CORRELATION AT 0.5 < z < 3

Peter KurczynskiDepartment of Physics and Astronomy , Rutgers University , Piscataway , NJ 08854 , USAEric GawiserDepartment of Physics and Astronomy , Rutgers University , Piscataway , NJ 08854 , USAViviana AcquavivaNew York City College of Technology , Brooklyn , NY 11201 , USABell, Eric FDepartment of Astronomy , University of Michigan , Ann Ar- bor MI 48109 , USAAvishai DekelCenter for Astrophysics and Planetary Science , Racah Insti- tute of Physics , The Hebrew University , Jerusalem 91904 , IsraelD. F. de MelloDepartment of Physics , The Catholic University of America , Washington , DC 20064 , USAHenry C. FergusonSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USAJonathan P. GardnerLaboratory for Observational Cosmology, Astrophysics Science Division, NASA Goddard Space Flight Center, Code 665, Greenbelt, MD 20771, USANorman A. GroginSpace Telescope Science Institute , 3700 San Martin Drive , Baltimore , MD 21218 , USAYicheng GuoUCO/Lick Observatory , Department of Astronomy and As- trophysics , University of California , Santa Cruz , CA , USAPhilip F. HopkinsTAPIR , Mailcode 350-17 ,A. M. KoekemoerSpace Telescope Science Institute , 3700 San Martin Drive , Baltimore , MD 21218 , USADavid C. KooDepartment of Physics and Astronomy , Seoul National Univer- sity , Seoul , 151-742 , Republic of KoreaSeong-Kook LeeCenter for the Exploration of the Origin of the Universe ,B. MobasherDepartment of Physics and Astronomy , University of Cali- fornia , Riverside , CA , USAJoel R. PrimackDepartment of Physics , University of California , Santa Cruz , CA , 95064 , USAMarc RafelskiLaboratory for Observational Cosmology , Astrophysics Sci- ence Division , Code 665 , Goddard Space Flight Center , Green- belt , MD 20771 , USAEmmaris SotoDeleted InstitutionHarry I. TeplitzInfrared Processing and Analysis Center, Caltech, MS 100-22, Pasadena, CA 91125, USA

2016en

ABI

Abstract

We present estimates of intrinsic scatter in the Star Formation Rate (SFR) -\nStellar Mass (M*) correlation in the redshift range 0.5 < z < 3.0 and in the\nmass range 10^7 < M* < 10^11 Msun. We utilize photometry in the Hubble\nUltradeep Field (HUDF12), Ultraviolet Ultra Deep Field (UVUDF) campaigns and\nCANDELS/GOODS-S. We estimate SFR, M* from broadband Spectral Energy\nDistributions (SEDs) and the best available redshifts. The maximum depth of the\nHUDF photometry (F160W 29.9 AB, 5 sigma depth) probes the SFR-M* correlation\ndown to M* ~ 10 ^7 Msun, a factor of 10-100X lower in M* than previous studies,\nand comparable to dwarf galaxies in the local universe. We find the slope of\nthe SFR-M* relationship to be near unity at all redshifts and the normalization\nto decrease with cosmic time. We find a moderate increase in intrinsic scatter\nwith cosmic time from 0.2 to 0.4 dex across the epoch of peak cosmic star\nformation. None of our redshift bins show a statistically significant increase\nin intrinsic scatter at low mass. However, it remains possible that intrinsic\nscatter increases at low mass on timescales shorter than ~ 100 Myr. Our results\nare consistent with a picture of gradual and self-similar assembly of galaxies\nacross more than three orders of magnitude in stellar mass from as low as 10^7\nMsun.

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