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The ALHAMBRA survey: Tight dependence of the optical mass-to-light ratio on galaxy colour up to z = 1.5

AuthorsLópez-Sanjuan, C.; Díaz-García, L.A.; Cenarro, A.J.; Fernández-Soto, Alberto ; Viironen, K.; Molino, Alberto : Benítez, Narciso; Cristóbal-Hornillos, David ; Moles, Mariano ; Varela, Jesús ; Arnalte-Mur, P. ; Ascaso, Begoña ; Castander, Francisco J. ; Cerviño, Miguel ; González Delgado, Rosa M. ; Husillos, César ; Márquez, Isabel ; Masegosa, Josefa ; Olmo, Ascensión del ; Pović, Mirjana; Perea, Jaime
KeywordsGalaxies: statistics
Galaxies: stellar content
Galaxies: fundamental parameters
Issue Date2019
PublisherEDP Sciences
CitationAstronomy and Astrophysics 622:A51 (2019)
AbstractAims. Our goal is to characterise the dependence of the optical mass-to-light ratio on galaxy colour up to z = 1.5, expanding the redshift range explored in previous work. Methods. From the redshifts, stellar masses, and rest-frame luminosities of the ALHAMBRA multi-filter survey, we derive the mass-to-light ratio versus colour relation for quiescent and for star-forming galaxies. The intrinsic relation and its physical dispersion are derived with a Bayesian inference model. Results. The rest-frame i-band mass-to-light ratio of quiescent and star-forming galaxies presents a tight correlation with the rest-frame (g - i) colour up to z = 1.5. The mass-to-light ratio versus colour relation is linear for quiescent galaxies and quadratic for star-forming galaxies. The intrinsic dispersion in these relations is 0.02 dex for quiescent galaxies and 0.06 dex for star-forming ones. The derived relations do not present a significant redshift evolution and are compatible with previous local results in the literature. Finally, these tight relations also hold for g- and r-band luminosities. Conclusions. The derived mass-to-light ratio versus colour relations in ALHAMBRA can be used to predict the mass-to-light ratio from a rest-frame optical colour up to z = 1.5. These tight correlations do not change with redshift, suggesting that galaxies have evolved along the derived relations during the last 9 Gyr.© ESO 2019.
Identifiersdoi: 10.1051/0004-6361/201833402
issn: 1432-0746
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