Cosmo-torun May 2007

cosmo-torun@cosmo.torun.pl

2 participants
4 discussions

astrogrid-pl (astropolityka)
by Boud Roukema 31 May '07

31 May '07

Witam cosmo-torun, Istnieje grupa dyskusyjna dla ASTROGRID-PL - projekt administracyjno-polityczny dla klastrów komputerowych dla astronomów w Polsce. Nie jestem odpowiedzialny dla poufny/zcentralizowany sposób według którym jest zaorganizowany - prosiłem aby Bartek jest napisany w grupie, Geniu już jest. Jeśli ktoś więcej się interesuje, mów i mogę prosić że jesteś dodawany. Jest trochę cieżki sposób zaorganizować komunikację, ale jeszcze raz, to nie moja winna. pozdr boud

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http://arxiv.org/abs/0705.3655
by Bartosz Lew 28 May '07

28 May '07

hi everyone this sounds interesting http://arxiv.org/abs/0705.3655 Title: Evidence Of Dark Matter Annihilations In The WMAP Haze Authors: <a href="http://arxiv.org/find/astro-ph/1/au:+Hooper_D/0/1/0/all/0/1">Dan Hooper</a>, <a href="http://arxiv.org/find/astro-ph/1/au: +Finkbeiner_D/0/1/0/all/0/1">Douglas P. Finkbeiner</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dobler_G/0/1/0/all/0/1">Gregory Dobler</a> Comments: 4 pages, 3 figures The WMAP experiment has revealed an excess of microwave emission from the region around the center of our Galaxy. It has been suggested that this signal, known as the ``WMAP Haze'', could be synchrotron emission from relativistic electrons and positrons generated in dark matter annihilations. In this letter, we revisit this possibility. We find that the angular distribution of the WMAP Haze matches the prediction for dark matter annihilations with a cusped density profile, $\rho(r) \propto r^{-1.2}$ in the inner kiloparsecs. Comparing the intensity in different WMAP frequency bands, we find that a wide range of possible WIMP annihilation modes are consistent with the spectrum of the haze for a WIMP with a mass in the 100 GeV to multi-TeV range. Most interestingly, we find that to generate the observed intensity of the haze, the dark matter annihilation cross section is required to be approximately equal to the value needed for a thermal relic, $\sigma v \sim 3 \times 10^{-26}$ cm$^3$/s. No boost factors are required. If dark matter annihilations are in fact responsible for the WMAP Haze, and the slope of the halo profile continues into the inner Galaxy, GLAST is expected to detect gamma rays from the dark matter annihilations in the Galactic Center if the WIMP mass is less than several hundred GeV. -- Bartosz Lew, The Graduate School of Science, Nagoya University email: blew(a)a.phys.nagoya-u.ac.jp tel: +81 52 7892842 www: mail: Department of Physics and Astrophysics, Nagoya University, Chikusa-ku Nagoya 464-8602 Japan

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Verschuur [0704.1125] HI correlates with 1deg scale WMAP hot spots?
by Boud Roukema 17 May '07

17 May '07

witam cosmo-torun, http://cosmocoffee.info/viewtopic.php?t=865 astro-ph/0704.1125 High Galactic latitude interstellar neutral hydrogen (HI) structure and associated acoustic-scale WMAP hot spots Authors: Gerrit L. Verschuur Associations have been found between interstellar neutral hydrogen (HI) emission morphology and small-scale structure observed by the Wilkinson Microwave Anisotropy Probe (WMAP) in a Target Area bounded by l = 60 deg & 180 deg, b = 30 deg & 70 deg. ... Is some part of the angular power spectrum at about a degree (first "Doppler peak") due to interacting/colliding HI clouds around our Galaxy? pozdr boud

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spotka sroda 13:00 czas polski = 20:00 czas japonski @KRA + gg
by Boud Roukema 07 May '07

07 May '07

witam, Spotkanie kosmo - dyskusja naszych róźnych projektów: * środa 9.05.2007r. w sali seminarium KRA o 13.00g Bartek + Agnieszka + Zbyszek + Boud + otwarte dla innych interesowanych w badania kosmo. Bartek będzie obecny przez gg i próbujemy też ekiga audio/video :). pozdr boud

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Cosmo-torun May 2007