3K, SN’s, Clusters: Hunting the Cosmological Parameters with by Sébastien Fabbro (auth.), Domingos Barbosa, António José Da

By Sébastien Fabbro (auth.), Domingos Barbosa, António José Da Silva, Ana Maria Mourão (eds.)

The previous couple of years observed the improvement of a plethora of experiments and surveys probing the cosmological parameters. The Cosmic Microwave historical past (CMB), the Supernovae (SN) searches and galaxy cluster information, specifically through X-rays and Sunyaev-Zel'dovich impact, are one of the such a lot prolific giving unique information regarding the geometry, age and constitution formation of the Universe.

The software of the WS-HCP workshop was once aimed toward highlighting the clinical achievements and to debate the hot surroundings of "precision cosmology" inside those 3 probes. the target used to be to examine assorted observational innovations, universal difficulties specifically foregrounds, and to evaluate the influence of observational uncertainties within the choice of key cosmological parameters which describe the primordial universe and the massive scale constitution formation mechanism.

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Extra info for 3K, SN’s, Clusters: Hunting the Cosmological Parameters with Precision Cosmology: A JENAM 2002 Workshop Porto, Portugal 3–5 September 2002

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5 38 32 DISTANCE MODULUS Figure 2. The Hubble diagram for SNe Ia before (top panel ) and after (bottom panel) correction of the width-absolute brightness relationship. The figure is from Riess, Press and Kirshner (I 995a). 0 0.. 0 Figure 3. 5 according to Goobar and Perlmutter (1995). SNe Ia at different z allow to discriminate between possible Universe models. 2. QUESTIONS ANSWERED IN THE LAST YEARS Two important questions were raised soon after the results from 1998 were known. The method finds Type Ia supernovae at high z being dimmer than what they should be for an Einstein-de Sitter universe or an open A = 0 Universe.

Cepheids are considered very good distance indicators, but before the recognition that there were two basic dasses of Cepheids (Baade, 1954, 1956), the distance scale was grossly underestimated. , 1999). Anomalaus objects have been found among the Cepheids as weil. , 2001). g. , 1978). They are indeed among the most luminous objects we know, but due to their evolution it is well known that their luminosity can differ considerably from object to object. They can not be used individually as distance indicators.

2001 ). , 2001 ). Statistical evaluation is so far consistent with no difference among the low-z and high-z samples. Moreover, the possibility of existence of an extra parameter in the maximum brightness-rate of decline relation has been carefully examined. Among possible inftuences, metallicity was one of the obvious ones to consider. We know that it plays an important role in the Cepheid period luminosity-relationship which is widely used in distance determinations at more modest redshifts.

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