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29 March 2024 |
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The Herschel view of the dominant mode of galaxy growth from z=4 to the present day | Corentin Schreiber
; Maurilio Pannella
; David Elbaz
; Matthieu Béthermin
; Hanae Inami
; Mark E. Dickinson
; Benjamin Magnelli
; Tao Wang
; Hervé Aussel
; Emanuele Daddi
; Stéphanie Juneau
; Xinwen Shu
; Mark T. Sargent
; Véronique Buat
; Sandra M. Faber
; Henry C. Ferguson
; Mauro Giavalisco
; Anton M. Koekemoer
; Georgios Magdis
; Glenn E. Morrison
; Casey Papovich
; Paola Santini
; Douglas Scott
; | Date: |
18 Sep 2014 | Abstract: | We present an analysis of the deepest Herschel images in four major
extragalactic fields GOODS-North, GOODS-South, UDS and COSMOS obtained within
the GOODS-Herschel and CANDELS-Herschel key programs. The picture provided by
10497 individual far-infrared detections is supplemented by the stacking
analysis of a mass-complete sample of 62361 star-forming galaxies from the
CANDELS-HST H band-selected catalogs and from two deep ground-based Ks
band-selected catalogs in the GOODS-North and the COSMOS-wide fields, in order
to obtain one of the most accurate and unbiased understanding to date of the
stellar mass growth over the cosmic history. We show, for the first time, that
stacking also provides a powerful tool to determine the dispersion of a
physical correlation and describe our method called "scatter stacking" that may
be easily generalized to other experiments. We demonstrate that galaxies of all
masses from z=4 to 0 follow a universal scaling law, the so-called main
sequence of star-forming galaxies. We find a universal close-to-linear slope of
the logSFR-logM* relation with a non varying dispersion of 0.3 dex. We also
find evidence for a flattening of the main sequence at high masses
(log(M*/Msun) > 10.5) that becomes less prominent with increasing redshift and
almost vanishes by z~2. It is tempting to associate this bending with the
parallel growth of quiescent bulges in star-forming galaxies. The specific SFR
(sSFR=SFR/M*) of star-forming galaxies is found to continuously increase from
z=0 to 4. Finally we discuss the implications of our findings on the cosmic SFR
history and show that more than two thirds of present-day stars must have
formed in a regime dominated by the main sequence mode. As a consequence we
conclude that, although omnipresent in the distant Universe, galaxy mergers had
little impact in triggering strong starbursts over the last 12.5 Gyr. | Source: | arXiv, 1409.5433 | Services: | Forum | Review | PDF | Favorites |
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