2019A&A...630A.145T

Query : 2019A&A...630A.145T

2019A&A...630A.145T - Astronomy and Astrophysics, volume 630A145-145 (2019/10-1)

The most massive, passive, and oldest galaxies at 0.5 < z < 2.1: Downsizing signature from galaxies selected from MgUV index.

THOMAS R., LE FEVRE O., ZAMORANI G., LEMAUX B.C., HIBON P., KOEKEMOER A., HATHI N., MACCAGNI D., CASSATA P., CASSARA L.P., BARDELLI S., TALIA M. and ZUCCA E.

Abstract (from CDS):


Aims. We seek is to identify old and massive galaxies at 0.5<z<2.1 on the basis of the magnesium index MgUV and then study their physical properties.
Methods. We computed the MgUV index based on the best spectral fitting template of ∼3700 galaxies using data from the VLT VIMOS Deep Survey (VVDS) and VIMOS Ultra Deep Survey (VUDS) galaxy redshift surveys. Based on galaxies with the largest signal to noise and the best fit spectra we selected 103 objects with the highest spectral MgUV signature. We performed an independent fit of the photometric data of these galaxies and computed their stellar masses, star formation rates, extinction by dust and age, and we related these quantities to the MgUV index.
Results. We find that the MgUV index is a suitable tracer of early-type galaxies at an advanced stage of evolution. Selecting galaxies with the highest MgUV index allows us to choose the most massive, passive, and oldest galaxies at any epoch. The formation epoch tf computed from the fitted age as a function of the total mass in stars supports the downsizing formation paradigm in which galaxies with the highest mass formed most of their stars at an earlier epoch.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: formation - galaxies: high-redshift - techniques: photometric - techniques: spectroscopic

Simbad objects: 104

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Number of rows : 104
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
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7 UDXS J022516.60-041403.1 LM* 02 25 16.60848 -04 14 03.1020           ~ 3 0
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57 VIDEO J022715.96-041220.43 G 02 27 15.971 -04 12 20.35   25.556 25.028 23.969 22.614 ~ 5 0
58 VIDEO J022716.66-042543.69 G 02 27 16.67 -04 25 43.7           ~ 4 0
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67 VIDEO J022725.80-043726.45 G 02 27 25.81 -04 37 26.4           ~ 3 0
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78 VVDS 020106372 G 02 28 13.17 -04 46 18.8           ~ 3 0
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85 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 862 0
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