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

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 facts, particularly through X-rays and Sunyaev-Zel'dovich impact, are one of the such a lot prolific giving targeted information regarding the geometry, age and constitution formation of the Universe.

The application of the WS-HCP workshop used to be geared toward highlighting the medical achievements and to debate the recent surroundings of "precision cosmology" inside of those 3 probes. the target was once to examine assorted observational options, 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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Additional info for 3K, SN’s, Clusters: Hunting the Cosmological Parameters with Precision Cosmology: A JENAM 2002 Workshop Porto, Portugal 3–5 September 2002

Example text

For Cepheids the inftuence of metalicity onto the period-luminosity relation requires a solution to increase the confidence of the measured distances. The SNe Ia explosions are largely not understood and predictions on their behaviour in different environments, ages, and configurations need to be resolved. The most powerful evidence for the exquisite distance accuracy provided by SNe Ia is the Hubble diagram in the nearby universe. The cosmology depends on the assumption that the distant supernovae yield distances of comparable accuracy SNE Ia AS STANDARD CANDLES 39 and in particular that their luminosity distribution follows the same normalisation as the nearby objects.

The reader will note that here we are talking about the spread of the SNe Ia samples in galaxies of different types: on how many fast SNe Ia versus intermediate or slow decliners are found in the various morphological types. Spirals at low or moderate redshifts should encompass all ranges of variation in the SNe Ia properties since they contain populations with a wide spread in age. , 2001). The fact that in old populations SNe Ia are systematically dimmer than in young populations could be interpreted in terms of what affects the progenitors of the SNela: the WDs.

2003). Also the simple light curve correlations found for most SNe Ia arenot followed by some of these objects, which make the use of the normalisation questionable. We should be mindful, that these objects could be signatures of new systematics and need to explore them carefully. Apart from the fact that these objects do not follow the established correlations they also have put the question whether SNe Ia are standard candles to rest. As always there is the possibility to argue that these objects are indeed separate classes, but this will first have to be shown convincingly as was the case for the SNe Ib/c.

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