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Title:
Cosmic Star Formation History and Its Dependence on Galaxy Stellar Mass
Authors:
Juneau, Stéphanie; Glazebrook, Karl; Crampton, David; McCarthy, Patrick J.; Savaglio, Sandra; Abraham, Roberto; Carlberg, Raymond G.; Chen, Hsiao-Wen; Le Borgne, Damien; Marzke, Ronald O.; Roth, Kathy; Jørgensen, Inger; Hook, Isobel; Murowinski, Richard
Affiliation:
AA(Département de Physique, Université de Montréal, 2900 Boulevard Édouard-Montpetit, Montréal, QC H3T 1J4, Canada; .; NRC Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada; , .), AB(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; ; .), AC(NRC Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada; , .), AD(Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101; .), AE(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218; ; .), AF(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Room 1403, Toronto, ON M5S 3H8, Canada; , , .), AG(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Room 1403, Toronto, ON M5S 3H8, Canada; , , .), AH(Center for Space Sciences, Massachusetts Institute of Technology, 70 Vassar Street, Building 37, Cambridge, MA 02139; .; Hubble Fellow.), AI(Department of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Room 1403, Toronto, ON M5S 3H8, Canada; , , .), AJ(Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132; .), AK(Gemini Observatory, 670 North A`ohoku Place, Hilo, HI 97620; , .), AL(Gemini Observatory, 670 North A`ohoku Place, Hilo, HI 97620; , .), AM(UK Gemini Operations Center, Oxford University, Keble Road, Oxford OX1 3RH, UK; .), AN(NRC Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V8X 4M6, Canada; , .)
Publication:
The Astrophysical Journal, Volume 619, Issue 2, pp. L135-L138. (ApJL Homepage)
Publication Date:
02/2005
Origin:
UCP
ApJ Keywords:
Galaxies: Evolution, Galaxies: Formation
DOI:
10.1086/427937
Bibliographic Code:
2005ApJ...619L.135J

Abstract

We examine the cosmic star formation rate (SFR) and its dependence on galaxy stellar mass over the redshift range 0.8<z<2 using data from the Gemini Deep Deep Survey (GDDS). The SFR in the most massive galaxies (M*>1010.8 Msolar) was 6 times higher at z=2 than it is today. It drops steeply from z=2, reaching the present-day value at z~1. In contrast, the SFR density of intermediate-mass galaxies (1010.2 Msolar<=M*<1010.8 Msolar) declines more slowly and may peak or plateau at z~1.5. We use the characteristic growth time tSFR≡ρM*SFR to provide evidence of an associated transition in massive galaxies from a burst to a quiescent star formation mode at z~2. Intermediate-mass systems transit from burst to quiescent mode at z~1, while the lowest mass objects undergo bursts throughout our redshift range. Our results show unambiguously that the formation era for galaxies was extended and proceeded from high- to low-mass systems. The most massive galaxies formed most of their stars in the first ~3 Gyr of cosmic history. Intermediate-mass objects continued to form their dominant stellar mass for an additional ~2 Gyr, while the lowest mass systems have been forming over the whole cosmic epoch spanned by the GDDS. This view of galaxy formation clearly supports ``downsizing'' in the SFR where the most massive galaxies form first and galaxy formation proceeds from larger to smaller mass scales.
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