Pratiques imaginées et images des pratiques plurilingues

Stalder, Pia

doi:10.3726/978-3-0352-0036-2

Cited by 37 publications

(2 citation statements)

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“…The current large sample of z > 1 clusters comes from X-ray surveys (e.g., Mullis et al 2005;Stanford et al 2006;Bremer et al 2006;Pacaud et al 2007;Henry et al 2010;Fassbender et al 2011a,b;Nastasi et al 2011;Santos et al 2011), spacebased MIR surveys (e.g., Stanford et al 2005;Eisenhardt et al 2008;Muzzin et al 2009;Wilson et al 2009;Papovich et al 2010;Demarco et al 2010;Brodwin et al 2011;Stanford et al 2012;Zeimann et al 2012), ground-based NIR surveys (e.g., Gobat et al 2011;Spitler et al 2012), millimeter SZE surveys (e.g., Brodwin et al 2010;Foley et al 2011;Stalder et al 2012), as well as narrow-band and MIR searches around high-redshift radio galaxies (e.g., Venemans et al 2007;Galametz et al 2010Galametz et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

DISCOVERY OF A RICH CLUSTER ATz= 1.63 USING THE REST-FRAME 1.6 μm “STELLAR BUMP SEQUENCE” METHOD

Muzzin

Wilson

Demarco

et al. 2013

ApJ

110

139

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We present a new two-color algorithm, the "Stellar Bump Sequence" (SBS), that is optimized for robustly identifying candidate high-redshift galaxy clusters in combined wide-field optical and midinfrared (MIR) data. The SBS algorithm is a fusion of the well-tested cluster red-sequence method of Gladders & Yee (2000) with the MIR 3.6µm -4.5µm cluster detection method developed by Papovich (2008). As with the cluster red-sequence method, the SBS identifies candidate overdensities within 3.6µm -4.5µm color slices, which are the equivalent of a rest-frame 1.6µm stellar bump "red-sequence". In addition to employing the MIR colors of galaxies, the SBS algorithm incorporates an optical/MIR (z ′ -3.6µm) color cut. This cut effectively eliminates foreground 0.2 < z < 0.4 galaxies which have 3.6µm -4.5µm colors that are similarly red as z > 1.0 galaxies and add noise when searching for highredshift galaxy overdensities. We demonstrate using the z ∼ 1 GCLASS cluster sample that similar to the red sequence, the stellar bump sequence appears to be a ubiquitous feature of high-redshift clusters, and that within that sample the color of the stellar bump sequence increases monotonically with redshift and provides photometric redshifts accurate to ∆z = 0.05. We apply the SBS method in the XMM-LSS SWIRE field and show that it robustly recovers the majority of confirmed optical, MIR, and X-ray-selected clusters at z > 1.0 in that field. Lastly, we present confirmation of SpARCS J022427-032354 at z = 1.63, a new cluster detected with the method and confirmed with 12 highconfidence spectroscopic redshifts obtained using FORS2 on the VLT. We conclude with a discussion of future prospects for using the algorithm.

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Section: Introductionmentioning

confidence: 99%

DISCOVERY OF A RICH CLUSTER ATz= 1.63 USING THE REST-FRAME 1.6 μm “STELLAR BUMP SEQUENCE” METHOD

Muzzin

Wilson

Demarco

et al. 2013

ApJ

110

139

View full text Add to dashboard Cite

show abstract

“…Therefore, the consistency of the cusp energetic hypothesis introduced here should be verified by existing theories as well as by those in development. In this sense, the second part of this article will aim to provide a comprehensive approach that can select the best candidates for describe the energetic cusp (+.-) in a complete cosmological approach pointing out possible observational constraints [11,12].…”

Section: Discussionmentioning

confidence: 99%

An alternative singularity-free cosmological scenario from cusp geometries

Rosa¹,

Strieder²,

Stalder³

2012

AIP Conference Proceedings

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We study an alternative geometrical approach on the problem of classical cosmological singularity. It is based on a generalized function f (x, y) = x 2 + y 2 = (1 − z)z n which consists of a cusped coupled isosurface. Such a geometry is computed and discussed into the context of Friedmann singularity-free cosmology where a pre-big bang scenario is considered. Assuming that the mechanism of cusp formation is described by non-linear oscillations of a pre-big bang extended very high energy density field (> 3 × 10 94 kg/m 3 ), we show that the action under the gravitational field follows a tautochrone of revolution, understood here as the primary projected geometry that alternatively replaces the Friedmann singularity in the standard big bang theory. As shown here this new approach allows us to interpret the nature of both matter and dark energy from first geometric principles.

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Stalder

2024

Palgrave Studies in Creativity and Culture

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Pratiques imaginées et images des pratiques plurilingues

Cited by 37 publications

References 0 publications

DISCOVERY OF A RICH CLUSTER ATz= 1.63 USING THE REST-FRAME 1.6 μm “STELLAR BUMP SEQUENCE” METHOD

DISCOVERY OF A RICH CLUSTER ATz= 1.63 USING THE REST-FRAME 1.6 μm “STELLAR BUMP SEQUENCE” METHOD

An alternative singularity-free cosmological scenario from cusp geometries

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