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Evolution histories of massive galaxies at z∼2 over the past 3 Gyr

Published online by Cambridge University Press:  10 June 2020

T. Morishita Open the ORCID record for T. Morishita [Opens in a new window] ,
L. E. Abramson ,
T. Treu ,
G. B. Brammer ,
T. Jones ,
P. Kelly ,
M. Stiavelli ,
M. Trenti ,
B. Vulcani  and
X. Wang
T. Morishita
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA email: tmorishita@stsci.edu
L. E. Abramson
Affiliation:
The Observatories of the Carnegie Institution for Science, Pasadena, CA, USA
T. Treu
Affiliation:
Department of Physics and Astronomy, UCLA, Los Angeles, CAUSA
G. B. Brammer
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA email: tmorishita@stsci.edu Cosmic Dawn Centre, University of Copenhagen, Copenhagen, Denmark
T. Jones
Affiliation:
University of California Davis, Davis, CA, USA
P. Kelly
Affiliation:
School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, USA
M. Stiavelli
Affiliation:
Space Telescope Science Institute, Baltimore, MD, USA email: tmorishita@stsci.edu
M. Trenti
Affiliation:
School of Physics, University of Melbourne, Parkville VIC, Australia ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions, Parkville VIC, Australia
B. Vulcani
Affiliation:
INAF – Osservatorio Astronomico di Padova, Padova, Italy
X. Wang
Affiliation:
Department of Physics and Astronomy, UCLA, Los Angeles, CAUSA
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Abstract

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We study star formation and metallicity enrichment histories of 24 massive galaxies at 1.6 < z < 2.5. Deep slitless spectroscopy + imaging data set collected from multiple HST surveys allows robust determination of their SEDs. Our new SED modeling with no functional assumptions on star formation histories revels that 1. most of the sample galaxies have already formed >50% of their extant masses ∼1.5 Gyr before the time of observed redshifts, with a trend where more massive galaxies form earlier, 2. most of our galaxies already have stellar metallicities compatible with those of local early-type galaxies, and 3. inferred metallicities are on average ∼ 0.25 dex higher than observed gas-phase metallicities of star forming galaxies at the time of their formation. Continuation of low-level star formation, rather than abrupt termination of star forming activity, may explain the observed gap of metallicities.

Keywords

galaxies: evolutiongalaxies: metallicity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S341: Challenges in Panchromatic Modelling with Next Generation Facilities , November 2019 , pp. 50 - 54
Copyright
© International Astronomical Union 2020

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