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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, Kerttu; Molino, Alberto ; Benítez, Narciso ; Cristóbal-Hornillos, David ; Moles, Mariano ; Varela, Jesús ; Arnalte-Mur, P. ; Ascaso, Begoña ; Cerviño, Miguel ; González Delgado, Rosa M. ; Husillos, César ; Márquez, Isabel ; Masegosa, Josefa ; Olmo, Ascensión del ; Pović, Mirjana; Perea, Jaime ; Castander, Francisco J.
KeywordsGalaxies: statistics
Galaxies: stellar content
Galaxies: fundamental parameters
Issue Date2019
PublisherEDP Sciences
CitationAstronomy and Astrophysics 622: A51 (2019)
Abstract[Aims] 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.
Publisher version (URL)https://doi.org/10.1051/0004-6361/201833402
Identifiersdoi: 10.1051/0004-6361/201833402
issn: 1432-0746
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