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<< CosmoNews ---++ cosmic strings - possible detections * AstroPh:0410073 - Kibble discusses new interest in cosmic strings, and the two following observational hints. The first one seems quite serious, at first glance: * AstroPh:0302547 gravitational lens - Sazhin et al * AstroPh:0406516 gravitational lens - Sazhin et al * AstroPh:0406434 grav lens - Schild et al. ---+++ Cosmic String Detection * In http://de.arxiv.org/abs/astro-ph/0410073 Kibble discusses the http://de.arxiv.org/abs/astro-ph/302547 possible detection of a cosmic string which seems to gravitationally lens a background galaxy (Sazhin et al.) In http://de.arxiv.org/abs/astro-ph/0406516 the extra pairs of lensed galaxies predicted by the hypothesis are discussed. * Aim: Understand the basics about (1) cosmic strings, (2) gravitational lensing versus cosmic string lensing, and test the hypothesis * Calculate the probability of seeing the original pair by chance * Check whether the statistics of expected numbers of lensed images are correct * Propose an independent test of the hypothesis, e.g. using radio observations and prepare an observing proposal ---+++ :( * AstroPh:0601494 Sazhin et al. The true nature of CSL-1 - two identical galaxies merging - have non-identical tidal tails showing merging ---++ how many cosmic strings could there be? * AstroPh:0503364 Bounds on Cosmic Strings from WMAP and SDSS ---+ szukanie kandydatów cosmic-string-lensed galaxies * W jakich katalogach? * wide-shallow surveys (WikipediaEn:SDSS 10<sup>8</sup> galaktyki bez redshiftów, 2dF-Galaxy WikipediaEn:2dF_Galaxy_Redshift_Survey 245,000 gal z redshiftami) vs narrow-deep surveys (WikipediaEn:Hubble_Deep_Field i więcej nowy, ...) * ESO Deep Public Survey: http://www.eso.org/science/eis/surveys/release_60000024_DPS.html * Jaki testy będzie używać? * pierwsze rough filter, później więćej precyzyjność * fotometria: * WikipediaEn:Digitized_Sky_Survey UK Schmidt Survey + POSS2 + ... * parametry od np http://en.wikipedia.org/wiki/Sextractor http://terapix.iap.fr/rubrique.php?id_rubrique=91/index.html http://www-int.stsci.edu/~holwerda/se.html * - maximum magnitude difference - %$\Delta(m_V)$%, maximum distance between pair of images, similar light profiles, galaxy type, etc. * spektro: z muszą być identicyczne (do jaka precyzji?) * obrazy - oglądać więćej precyzyjnie * NED: http://nedwww.ipac.caltech.edu/ * Strasbourg: Katalog katalogów: http://cdsweb.u-strasbg.fr/cats/Cats.htx * Virtual Observatory: http://www.euro-vo.org/ ---+ WMAP vs cosmic shear in galaxies * HepPh:0405218 A First Glimpse of String Theory in the Sky? Steen Hannestad (SDU, Nordita), Laura Mersini-Houghton (UNC-Chapel Hill) * 1 cosmic string %$\Rightarrow$% shear from gravitational lensing, e.g. WikipediaEn:Abell_2218 - efekt na mapę galaktyków * 1 cosmic string %$\Rightarrow$% efekt na mapa WMAPa * Więc: powinna być korelacji
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Topic revision: r1 - 28 Apr 2006,
BoudRoukema
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