The formation and evolution of early-type galaxies: solid results and open questions

Cimatti, A.; Giobbi, Giuliana; Tornambé, Amedeo; Raimondo, Gabriella; Limongi, Marco; Antonelli, L. A.; Menci, Nicola; Brocato, E.

doi:10.1063/1.3141542

Cited by 4 publications

(4 citation statements)

References 108 publications

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“…The green shaded area represent the total error on A(SFH, Z/Z ), given the uncertainty on the measured metallicity, while the blue area show the contribution to the error due to SFH. massive galaxies are older and have formed their stellar mass at higher redshifts with respect to less massive ones, providing another observational confirmation to the mass-downsizing scenario [25,26,[64][65][66].…”

Section: Measuring and Calibrating The Median D N 4000-z Relationsmentioning

confidence: 68%

A 6% measurement of the Hubble parameter at z∼0.45: direct evidence of the epoch of cosmic re-acceleration

Moresco

Pozzetti

Cimatti

et al. 2016

J. Cosmol. Astropart. Phys.

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922

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Deriving the expansion history of the Universe is a major goal of modern cosmology. To date, the most accurate measurements have been obtained with Type Ia Supernovae (SNe) and Baryon Acoustic Oscillations (BAO), providing evidence for the existence of a transition epoch at which the expansion rate changes from decelerated to accelerated. However, these results have been obtained within the framework of specific cosmological models that must be implicitly or explicitly assumed in the measurement. It is therefore crucial to obtain measurements of the accelerated expansion of the Universe independently of assumptions on cosmological models. Here we exploit the unprecedented statistics provided by the Baryon Oscillation Spectroscopic Survey (BOSS, [1, 2, 3]) Data Release 9 to provide new constraints on the Hubble parameter H(z) using the cosmic chronometers approach. We extract a sample of more than 130000 of the most massive and passively evolving galaxies, obtaining five new cosmology-independent H(z) measurements in the redshift range 0.3 < z < 0.5, with an accuracy of ∼11-16% incorporating both statistical and systematic errors. Once combined, these measurements yield a 6% accuracy constraint of H(z = 0.4293) = 91.8 ± 5.3 km/s/Mpc. The new data are crucial to provide the first cosmology-independent determination of the transition redshift at high statistical significance, measuring z t = 0.4 ± 0.1, and to significantly disfavor the null hypothesis of no transition between decelerated and accelerated expansion at 99.9% confidence level. This analysis highlights the wide potential of the cosmic chronometers approach: it permits to derive constraints on the expansion history of the Universe with results competitive with standard probes, and most importantly, being the estimates independent of the cosmological model, it can constrain cosmologies beyondand including -the ΛCDM model.

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Section: Measuring and Calibrating The Median D N 4000-z Relationsmentioning

confidence: 68%

A 6% measurement of the Hubble parameter at z∼0.45: direct evidence of the epoch of cosmic re-acceleration

Moresco

Pozzetti

Cimatti

et al. 2016

J. Cosmol. Astropart. Phys.

Self Cite

922

610

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“…There now exists overwhelming evidence confirming a "downsizing scenario" for ETGs, with more massive ETGs having completed their star formation and mass assembly at higher redshifts than less massive ones (e.g. see [13][14][15][16][25][26][27][28]). With the described selection criteria, thus, we have considered the reddest, oldest, passive envelope of ETGs in the entire redshift range, i.e.…”

Section: Jcap08(2012)006mentioning

confidence: 99%

“…see [13][14][15][16][25][26][27][28]). With the described selection criteria, thus, we have considered the reddest, oldest, passive envelope of ETGs in the entire redshift range, i.e.…”

Section: Sample Selectionmentioning

confidence: 99%

Improved constraints on the expansion rate of the Universe up to z ∼ 1.1 from the spectroscopic evolution of cosmic chronometers

Moresco

Cimatti

Jiménez

et al. 2012

J. Cosmol. Astropart. Phys.

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365

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Abstract. We present new improved constraints on the Hubble parameter H(z) in the redshift range 0.15 < z < 1.1, obtained from the differential spectroscopic evolution of early-type galaxies as a function of redshift. We extract a large sample of early-type galaxies (∼ 11000) from several spectroscopic surveys, spanning almost 8 billion years of cosmic lookback time (0.15 < z < 1.42). We select the most massive, red elliptical galaxies, passively evolving and without signature of ongoing star formation. Those galaxies can be used as standard cosmic chronometers, as firstly proposed by Jimenez & Loeb (2002), whose differential age evolution as a function of cosmic time directly probesWe analyze the 4000Å break (D4000) as a function of redshift, use stellar population synthesis models to theoretically calibrate the dependence of the differential age evolution on the differential D4000, and estimate the Hubble parameter taking into account both statistical and systematical errors.We provide 8 new measurements of H(z) (see Tab. 4), and determine its change in H(z) to a precision of 5 − 12% mapping homogeneously the redshift range up to z ∼ 1.1; for the first time, we place a constraint on H(z) at z = 0 with a precision comparable with the one achieved for the Hubble constant (about 5-6% at z ∼ 0.2), and covered a redshift range (0.5 < z < 0.8) which is crucial to distinguish many different quintessence cosmologies.These measurements have been tested to best match a ΛCDM model, clearly providing a statistically robust indication that the Universe is undergoing an accelerated expansion. This method shows the potentiality to open a new avenue in constrain a variety of alternative cosmologies, especially when future surveys (e.g. Euclid) will open the possibility to extend it up to z ∼ 2.-1 -

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“…The stellar mass and ages of the passive ETGs at z ∼ 1–2 require precursors characterized by strong (>100 M ⊙ yr −1 ) and short‐lived (0.1–0.3 Gyr) starbursts occurring at z > 2–3 (e.g. Cimatti 2009 and references therein).…”

Section: Introductionmentioning

confidence: 99%

The evolution of quiescent galaxies at high redshifts (z≥ 1.4)

Sánchez

Pozzi

Gruppioni

et al. 2011

Monthly Notices of the Royal Astronomical Society

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The formation and evolution of early-type galaxies: solid results and open questions

Abstract: The most recent results and some of the open key questions on the evolution of early-type galaxies are reviewed in the general cosmological context of massive galaxy formation.

Cited by 4 publications

References 108 publications

A 6% measurement of the Hubble parameter at z∼0.45: direct evidence of the epoch of cosmic re-acceleration

A 6% measurement of the Hubble parameter at z∼0.45: direct evidence of the epoch of cosmic re-acceleration

Improved constraints on the expansion rate of the Universe up to z ∼ 1.1 from the spectroscopic evolution of cosmic chronometers

The evolution of quiescent galaxies at high redshifts (z≥ 1.4)

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