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The Rise and Fall of Star Formation Histories of Blue Galaxies at Redshifts 0.2 < z < 1.4
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Author and Affiliation:
Pacifici, Camilla(Institut d'Astrophysique, Paris, France);
Kassin, Susan A.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Weiner, Benjamin(Arizona Univ., Steward Observatory, Tucson, AZ, United States);
Charlot, Stephane(Institut d'Astrophysique, Paris, France);
Gardner, Jonathan P.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
et al.
Abstract: Popular cosmological scenarios predict that galaxies form hierarchically from the merger of many progenitor, each with their own unique star formation history (SFH). We use the approach recently developed by Pacifici et al. to constrain the SFHs of 4517 blue (presumably star-forming) galaxies with spectroscopic redshifts in the range O.2 < z < 1:4 from the All-Wavelength Extended Groth Strip International Survey (AEGIS). This consists in the Bayesian analysis of the observed galaxy spectral ' energy distributions with a comprehensive library of synthetic spectra assembled using state-of-the-art models of star formation and chemical enrichment histories, stellar population synthesis, nebular emission and attenuation by dust. We constrain the SFH of each galaxy in our sample by comparing the observed fluxes in the B, R,l and K(sub s) bands and rest-frame optical emission-line luminosities with those of one million model spectral energy distributions. We explore the dependence of the resulting SFH on galaxy stellar mass and redshift. We find that the average SFHs of high-mass galaxies rise and fall in a roughly symmetric bell-shaped manner, while those of low-mass galaxies rise progressively in time, consistent with the typically stronger activity of star formation in low-mass compared to high-mass galaxies. For galaxies of all masses, the star formation activity rises more rapidly at high than at low redshift. These findings imply that the standard approximation of exponentially declining SFHs wIdely used to interpret observed galaxy spectral energy distributions is not appropriate to constrain the physical parameters of star-forming galaxies at intermediate redshifts.
Publication Date: Jan 01, 2012
Document ID:
20120016516
(Acquired Dec 05, 2012)
Subject Category: ASTROPHYSICS
Report/Patent Number: GSFC.JA.7350.2012
Document Type: Preprint
Contract/Grant/Task Num: PITN-GA-2008-214227; NSF AST 95-29098; NSF AST 00-71198
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
National Science Foundation; Arlington, VA, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 5p; In English; Original contains black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: COSMOLOGY; GALACTIC EVOLUTION; GALAXIES; STAR FORMATION; STARS; ASTRONOMICAL MODELS; STELLAR MODELS; RED SHIFT; SPECTRAL ENERGY DISTRIBUTION; SKY SURVEYS (ASTRONOMY)
Miscellaneous Notes: to be published in The Astrophysical Journal
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