2015A&A...579A...2I


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST03:00:18

2015A&A...579A...2I - Astronomy and Astrophysics, volume 579A, 2-2 (2015/7-1)

Evolution of the specific star formation rate function at z < 1.4 Dissecting the mass-SFR plane in COSMOS and GOODS.

ILBERT O., ARNOUTS S., LE FLOC'H E., AUSSEL H., BETHERMIN M., CAPAK P., HSIEH B.-C., KAJISAWA M., KARIM A., LE FEVRE O., LEE N., LILLY S., McCRACKEN H.J., MICHEL-DANSAC L., MOUTARD T., RENZINI M.A., SALVATO M., SANDERS D.B., SCOVILLE N., SHETH K., SILVERMAN J.D., SMOLCIC V., TANIGUCHI Y. and TRESSE L.

Abstract (from CDS):

The relation between the stellar mass (M*) and the star formation rate (SFR) characterizes how the instantaneous star formation is determined by the galaxy past star formation history and by the growth of the dark matter structures. We deconstruct the M*-SFR plane by measuring the specific SFR functions in several stellar mass bins from z=0.2 out to z=1.4 (specific SFR=SFR/M*, noted sSFR). Our analysis is primary based on a 24µm selected catalogue combining the COSMOS and GOODS surveys. We estimate the SFR by combining mid- and far-infrared data for 20500 galaxies. The sSFR functions are derived in four stellar mass bins within the range 9.5<log(M*/M)<11.5. First, we demonstrate the importance of taking into account selection effects when studying the M*-SFR relation. Secondly, we find a mass-dependent evolution of the median sSFR with redshift varying as sSFR∝ (1+z)b, with b increasing from b=2.88±0.12 to b=3.78±0.60 between M*=109.75M and M*=1011.1M, respectively. At low masses, this evolution is consistent with the cosmological accretion rate and predictions from semi-analytical models (SAM). This agreement breaks down for more massive galaxies showing the need for a more comprehensive description of the star formation history in massive galaxies. Third, we obtain that the shape of the sSFR function is invariant with time at z<1.4 but depends on the mass. We observe a broadening of the sSFR function ranging from 0.28dex at M*=109.75M to 0.46dex at M*=1011.1M. Such increase in the intrinsic scatter of the M*-SFR relation suggests an increasing diversity of star formation histories (SFHs) as the stellar mass increases. Finally, we find a gradual decline of the sSFR with stellar mass as log10(sSFR)∝-0.17M*. We discuss the numerous physical processes, as gas exhaustion in hot gas halos or secular evolution, which can gradually reduce the sSFR and increase the SFH diversity.

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Journal keyword(s): galaxies: evolution - galaxies: luminosity function, mass function - galaxies: stellar content - galaxies: star formation - galaxies: statistics - galaxies: formation

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2069 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST03:00:18

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NAME COSMOS Field -- Region defined in the sky
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Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
10 00 28.60 +02 12 21.0 [ ] D 2007ApJS..172..523M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
09 57 53.49 +02 26 47.2 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
236.82224 +42.12163 [ ]
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References (2069 between 1850 and 2020) (Total 2069)
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2020.07.10-03:00:18

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