2017MNRAS.467.3239R

Query : 2017MNRAS.467.3239R

2017MNRAS.467.3239R - Mon. Not. R. Astron. Soc., 467, 3239-3254 (2017/May-3)

Age-dating luminous red galaxies observed with the Southern African Large Telescope.

RATSIMBAZAFY A.L., LOUBSER S.I., CRAWFORD S.M., CRESS C.M., BASSETT B.A., NICHOL R.C. and VAISANEN P.

Abstract (from CDS):

We measure a value for the cosmic expansion of H(z) = 89 ± 23(stat) ± 44(syst) km s–1 Mpc–1 at a redshift of z ≃ 0.47 based on the differential age technique. This technique, also known as cosmic chronometers, uses the age difference between two redshifts for a passively evolving population of galaxies to calculate the expansion rate of the Universe. Our measurement is based on the analysis of high-quality spectra of luminous red galaxies obtained with the Southern African Large Telescope in two narrow redshift ranges of z ≃ 0.40 and 0.55 as part of an initial pilot study. Ages were estimated by fitting single stellar population models to the observed spectra. This measurement presents one of the best estimates of H(z) via this method at z ∼ 0.5 to date.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - cosmological parameters - cosmology: observations - cosmology: observations

Simbad objects: 17

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Number of rows : 17
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
1 SDSS J010427.14+001921.5 rG 01 04 27.14578 +00 19 21.5363     19.71     ~ 4 0
2 SDSS J013403.82+004358.8 BiC 01 34 03.827 +00 43 58.83           ~ 3 0
3 2SLAQ J022112.71+001240.3 G 02 21 12.71 +00 12 40.3     20.80     ~ 2 0
4 * kap For SB* 02 22 32.5904688744 -23 49 00.479863128   5.802 5.198   4.51 G0V 285 0
5 2SLAQ J081258.12-000213.8 G 08 12 58.12 -00 02 13.8     19.65     ~ 2 0
6 2SLAQ J081332.20-004255.1 G 08 13 32.20 -00 42 55.1     19.62     ~ 2 0
7 2SLAQ J092612.79+000455.8 G 09 26 12.79 +00 04 55.8     20.52     ~ 2 0
8 2SLAQ J092740.75+003634.1 G 09 27 40.75 +00 36 34.1     20.51     ~ 2 0
9 2SLAQ J100121.88+002636.4 G 10 01 21.88 +00 26 36.4     19.48     ~ 2 0
10 2SLAQ J100131.77-000548.0 G 10 01 31.77 -00 05 48.0     20.03     ~ 2 0
11 2SLAQ J100315.23-001519.2 G 10 03 15.23 -00 15 19.2     19.62     ~ 2 0
12 2SLAQ J100825.72-002443.3 G 10 08 25.72 -00 24 43.3     19.44     ~ 2 0
13 2SLAQ J104118.06+001922.3 G 10 41 18.06 +00 19 22.3     20.02     ~ 2 0
14 2SLAQ J134023.93-003126.8 G 13 40 23.93 -00 31 27.1     18.89     ~ 3 0
15 2SLAQ J134058.83-003633.6 G 13 40 58.83 -00 36 33.6     19.29     ~ 2 0
16 2SLAQ J144110.62-002754.5 BiC 14 41 10.6171047552 -00 27 54.447726312     20.55     ~ 5 0
17 2SLAQ J225540.39-001810.7 G 22 55 40.39 -00 18 10.7     19.99     ~ 2 0

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