The Absolute Age of the Globular Cluster M15 Using Near-Infrared Adaptive Optics Images From Pisces/LBT

Monelli, M.; Testa, V.; Bono, G.; Ferraro, I.; Iannicola, G.; Fiorentino, G.; Arcidiacono, Carmelo; Massari, D.; Boutsia, K.; Briguglio, Runa; Busoni, Lorenzo; Carini, R.; Close, Laird M.; Cresci, G.; Esposito, Simone; Fini, Luca; Fumana, M.; Guerra, Juan Carlos; Hill, John M.; Kulesa, Craig; Mannucci, F.; McCarthy, D. W.; Pinna, Enrico; Puglisi, Alfio; Quirós-Pacheco, Fernando; Ragazzoni, Roberto; Riccardi, Armando; Skemer, Andrew J.; Xompero, Marco

doi:10.1088/0004-637x/812/1/25

Cited by 26 publications

(27 citation statements)

References 96 publications

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“…Therefore, in Figure 7.1 we also plot the three isochrones that would correspond to the cosmic ages of 13.2, 13.7, and 14.2 Gyr in the standard model. There is a quite good convergence to the range of t 0 = (13.7 ± 0.5) Gyr coming from absolute ages of stellar systems and different classes of observations [92, 38,177]. The age predictions of our and P16 best-fit ΛCDM models perfectly agree with these, while the R18 value is pulling towards a slightly younger Universe.…”

Section: Hubble Constant Issuesupporting

confidence: 67%

Cosmological Constraints from Low-Redshift Data

Luković¹,

Haridasu

Vittorio³

2018

Found Phys

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Section: Hubble Constant Issuesupporting

confidence: 67%

Cosmological Constraints from Low-Redshift Data

Luković¹,

Haridasu

Vittorio³

2018

Found Phys

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“…Here we used the result of our combined analysis for the Hubble constant to compare t 0 with the estimate of the absolute ages of stellar systems (Bono et al 2010;Monelli et al 2015). There is a quite good convergence on the value t 0 = (13.7 ± 0.5) Gyr from different classes of observations (see, for a review, Freedman & Madore (2010)).…”

Section: Indirect H 0 Estimatesmentioning

confidence: 97%

Is there a concordance value forH₀?

Luković

D’Agostino

Vittorio

2016

A&A

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Context. We test the theoretical predictions of several cosmological models against different observables to compare the indirect estimates of the current expansion rate of the Universe determined from model fitting with the direct measurements based on Cepheids data published recently. Aims. We perform a statistical analysis of type Ia supernova (SN Ia), Hubble parameter, and baryon acoustic oscillation data. A joint analysis of these datasets allows us to better constrain cosmological parameters, but also to break the degeneracy that appears in the distance modulus definition between H 0 and the absolute B-band magnitude of SN Ia, M 0 . Methods. From the theoretical side, we considered spatially flat and curvature-free ΛCDM, wCDM, and inhomogeneous Lemaître-Tolman-Bondi (LTB) models. To analyse SN Ia we took into account the distributions of SN Ia intrinsic parameters. Results. For the ΛCDM model we find that Ω m = 0.35 ± 0.02, H 0 = (67.8 ± 1.0) km s −1 /Mpc, while the corrected SN absolute magnitude has a normal distribution N(19.13, 0.11). The wCDM model provides the same value for Ω m , while H 0 = (66.5 ± 1.8) km s −1 /Mpc and w = −0.93 ± 0.07. When an inhomogeneous LTB model is considered, the combined fit provides H 0 = (64.2 ± 1.9) km s −1 /Mpc. Conclusions. Both the Akaike information criterion and the Bayes factor analysis cannot clearly distinguish between ΛCDM and wCDM cosmologies, while they clearly disfavour the LTB model. For the ΛCDM, our joint analysis of the SN Ia, the Hubble parameter, and the baryon acoustic oscillation datasets provides H 0 values that are consistent with cosmic microwave background (CMB)-only Planck measurements, but they differ by 2.5σ from the value based on Cepheids data.

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“…Recently, a new tool was introduced to measure accurate star cluster parameters based on high precision infrared (IR) CMDs. Sarajedini et al (2009) and Bono et al (2010) demonstrated that the MS in a pure IR CMD exhibits a change in the color-magnitude relation of stars at ∼ 0.5 M ⊙ , with 1 Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555 2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA; correnti, jkalirai, gennaro, tbrown, calamida@stsci.edu 3 Center for Astrophysical Science, John Hopkins University, Baltimore, MD 21218, USA color rapidly shifting to the blue (Pulone et al 1998(Pulone et al , 1999Zoccali et al 2000;Calamida et al 2009;Kalirai et al 2012;Milone et al 2012bMilone et al , 2014Monelli et al 2015). We will refer to this feature as the MS kink (hereafter MSK).…”

Section: Introductionmentioning

confidence: 99%

The Age of the Old Metal-poor Globular Cluster NGC 6397 Using WFC3/IR Photometry*

Correnti

Gennaro

Kalirai

et al. 2018

ApJ

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Globular Clusters (GCs) in the Milky Way represent the ideal laboratory to establish the age of the oldest stellar populations and to measure the color-magnitude relation of stars. Infrared (IR) photometry of these objects provides a new opportunity to accomplish this task. In particular, at low stellar masses, the stellar main sequence (MS) in an IR color-magnitude diagram (CMD) exhibits a sharp "kink" (due to opacity effects in M dwarfs), such that lower mass and cooler dwarfs become bluer in the F110W − F160W color baseline and not redder. This inversion of the color-magnitude relation offers the possibility to fit GC properties using IR imaging, and to reduce their uncertainties. Here, we used the IR channel of the Wide Field Camera 3 onboard the Hubble Space Telescope to obtain new, deep high-resolution photometry of the old metal-poor GC NGC 6397. From the analysis of the GC CMD, we revealed below the MS "kink" the presence of two MSs with different chemical composition. We derived the cluster fiducial line and we compared it with a grid of isochrones over a large range of parameter space, allowing age, metallicity, distance and reddening to vary freely within reasonable selected ranges. We derived an age of 12.6 Gyr with a random uncertainty σ ∼ 0.7 Gyr. These results confirm that the analysis of the IR color-magnitude of stars provide a valuable tool to measure the GC ages and offers a new venue to determine their absolute age to sub-Gyr accuracy with next generation IR telescopes.

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The Absolute Age of the Globular Cluster M15 Using Near-Infrared Adaptive Optics Images From Pisces/LBT

Cited by 26 publications

References 96 publications

Cosmological Constraints from Low-Redshift Data

Cosmological Constraints from Low-Redshift Data

Is there a concordance value forH₀?

The Age of the Old Metal-poor Globular Cluster NGC 6397 Using WFC3/IR Photometry*

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The Absolute Age of the Globular Cluster M15 Using Near-Infrared Adaptive Optics Images From Pisces/LBT

Cited by 26 publications

References 96 publications

Cosmological Constraints from Low-Redshift Data

Cosmological Constraints from Low-Redshift Data

Is there a concordance value forH0?

The Age of the Old Metal-poor Globular Cluster NGC 6397 Using WFC3/IR Photometry*

Contact Info

Product

Resources

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Is there a concordance value forH₀?