First Light And Reionisation Epoch Simulations (flares) - IV. The size evolution of galaxies at z >= 5
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
First Light And Reionisation Epoch Simulations (flares) - IV. The size evolution of galaxies at z >= 5. / Roper, William J.; Lovell, Christopher C.; Vijayan, Aswin P.; Marshall, Madeline A.; Irodotou, Dimitrios; Kuusisto, Jussi K.; Thomas, Peter A.; Wilkins, Stephen M.
In: Monthly Notices of the Royal Astronomical Society, Vol. 514, No. 2, 15.06.2022, p. 1921-1939.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - First Light And Reionisation Epoch Simulations (flares) - IV. The size evolution of galaxies at z >= 5
AU - Roper, William J.
AU - Lovell, Christopher C.
AU - Vijayan, Aswin P.
AU - Marshall, Madeline A.
AU - Irodotou, Dimitrios
AU - Kuusisto, Jussi K.
AU - Thomas, Peter A.
AU - Wilkins, Stephen M.
PY - 2022/6/15
Y1 - 2022/6/15
N2 - We present the intrinsic and observed sizes of galaxies at z >= 5 in the First Light And Reionisation Epoch Simulations (flares). We employ the large effective volume of flares to produce a sizeable sample of high-redshift galaxies with intrinsic and observed luminosities and half-light radii in a range of rest-frame ultraviolet (UV) and visual photometric bands. This sample contains a significant number of intrinsically ultracompact galaxies in the far-UV (1500 angstrom), leading to a negative intrinsic far-UV size-luminosity relation. However, after the inclusion of the effects of dust these same compact galaxies exhibit observed sizes that are as much as 50 times larger than those measured from the intrinsic emission, and broadly agree with a range of observational samples. This increase in size is driven by the concentration of dust in the core of galaxies, heavily attenuating the intrinsically brightest regions. At fixed luminosity we find a galaxy size redshift evolution with a slope of m = 1.21-1.87 depending on the luminosity sample in question, and we demonstrate the wavelength dependence of the size-luminosity relation that will soon be probed by the James Webb Space Telescope.
AB - We present the intrinsic and observed sizes of galaxies at z >= 5 in the First Light And Reionisation Epoch Simulations (flares). We employ the large effective volume of flares to produce a sizeable sample of high-redshift galaxies with intrinsic and observed luminosities and half-light radii in a range of rest-frame ultraviolet (UV) and visual photometric bands. This sample contains a significant number of intrinsically ultracompact galaxies in the far-UV (1500 angstrom), leading to a negative intrinsic far-UV size-luminosity relation. However, after the inclusion of the effects of dust these same compact galaxies exhibit observed sizes that are as much as 50 times larger than those measured from the intrinsic emission, and broadly agree with a range of observational samples. This increase in size is driven by the concentration of dust in the core of galaxies, heavily attenuating the intrinsically brightest regions. At fixed luminosity we find a galaxy size redshift evolution with a slope of m = 1.21-1.87 depending on the luminosity sample in question, and we demonstrate the wavelength dependence of the size-luminosity relation that will soon be probed by the James Webb Space Telescope.
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: photometry
KW - MASS ASSEMBLY GAMA
KW - DARK-AGES REIONIZATION
KW - EAGLE SIMULATIONS
KW - PHOTOMETRIC PROPERTIES
KW - BRIGHT GALAXIES
KW - BLACK-HOLES
KW - REDSHIFT
KW - STELLAR
KW - MODEL
KW - DUST
U2 - 10.1093/mnras/stac1368
DO - 10.1093/mnras/stac1368
M3 - Journal article
VL - 514
SP - 1921
EP - 1939
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 319534692