A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Galaxy and mass assembly (GAMA): the consistency of GAMA and WISE derived mass-to-light ratios
Tekijät: Kettlety T, Hesling J, Phillipps S, Bremer MN, Cluver ME, Taylor EN, Bland-Hawthorn J, Brough S, De Propris R, Driver SP, Holwerda BW, Kelvin LS, Sutherland W, Wright AH
Kustantaja: OXFORD UNIV PRESS
Julkaisuvuosi: 2018
Journal: Monthly Notices of the Royal Astronomical Society
Tietokannassa oleva lehden nimi: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Lehden akronyymi: MON NOT R ASTRON SOC
Vuosikerta: 473
Numero: 1
Aloitussivu: 776
Lopetussivu: 783
Sivujen määrä: 8
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stx2379
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/27882083
Recent work has suggested that mid-IR wavelengths are optimal for estimating the mass-to-light ratios of stellar populations and hence the stellar masses of galaxies. We compare stellar masses deduced from spectral energy distribution (SED) models, fitted to multiwavelength optical-NIR photometry, to luminosities derived from WISE photometry in the W1 and W2 bands at 3.6 and 4.5 mu m for non-star forming galaxies. The SED-derived masses for a carefully selected sample of low-redshift (z <= 0.15) passive galaxies agree with the prediction from stellar population synthesis models such that M-*/L-W1 similar or equal to 0.6 for all such galaxies, independent of other stellar population parameters. The small scatter between masses predicted from the optical SED and from the WISE measurements implies that random errors (as opposed to systematic ones such as the use of different initial mass functions) are smaller than previous, deliberately conservative, estimates for the SED fits. This test is subtly different from simultaneously fitting at a wide range of optical and mid-IR wavelengths, which may just generate a compromised fit: we are directly checking that the best-fitting model to the optical data generates an SED whose M-*/L-W1 is also consistent with separate mid-IR data. We confirm that for passive low-redshift galaxies a fixed M-*/L-W1 = 0.65 can generate masses at least as accurate as those obtained from more complex methods. Going beyond the mean value, in agreement with expectations from the models, we see a modest change in M-*/L-W1 with SED fitted stellar population age but an insignificant one with metallicity.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
