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<p>-------- Mensaje original --------</p>

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<th align="right" valign="baseline" nowrap="nowrap">Asunto:</th>

<td>Charla Martes 18/4 11:15 hs Arrival directions of the high-energy cosmic rays</td>

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<th align="right" valign="baseline" nowrap="nowrap">Fecha:</th>

<td>2017-04-17 19:55</td>

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<th align="right" valign="baseline" nowrap="nowrap">Remitente:</th>

<td>Matías Tueros <mjtueros@gmail.com></td>

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<th align="right" valign="baseline" nowrap="nowrap">Destinatario:</th>

<td>Secretaria del Dpto.de Física <secre2@fisica.unlp.edu.ar></td>

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<div class="gmail_extra"><span id=":4zl.389" class="">Ho</span>la <span id=":4zl.390" class="">Cecilia</span>.<br /><br />Podrías enviar esto a todos? Muchas Gracias!<br /><br />Estimados colegas </div>

<div class="gmail_extra">Mañana visita nuestro grupo el <span id=":4zl.392" class="">Ugo</span> <span id=":4zl.393" class="">Gregorio</span> <span id=":4zl.394" class="">Giacarri</span> de la Universidad Federal de <span id=":4zl.395" class="">Rio</span> de <span id=":4zl.396" class="">Janeiro</span>,y dará una charla repasando los estudios sobre la distribución de las direcciones de arribo de los rayos cósmicos de ultra alta energía luego de 10 años de operación del Observatorio <span id=":4zl.400" class="">Auger</span>. Siendo una charla en carácter de <span id=":4zl.402" class="">review</span>, puede ser interesante para cualquiera que quiera estar al tanto del estado del arte en el tema. Los esperamos! </div>

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<div class="gmail_extra">Martes 18/4 11:15hs Aula <span id=":4zl.403" class="">Ex</span>-<span id=":4zl.404" class="">Gamboa</span><br /><span id=":4zl.405" class="">Ugo</span> <span id=":4zl.406" class="">Gregorio</span> <span id=":4zl.407" class="">Giaccari</span> (<span id=":4zl.408" class="">Rio</span> de <span id=":4zl.409" class="">Janeiro</span> Federal U. & <span id=":4zl.410" class="">Pierre</span> <span id=":4zl.411" class="">Auger</span> <span id=":4zl.412" class="">Observ</span>.) <br /> <span id=":4zl.413" class="">Arrival</span> <span id=":4zl.414" class="">directions</span> <span id=":4zl.415" class="">of</span> <span id=":4zl.416" class="">the</span> <span id=":4zl.417" class="">high</span>-<span id=":4zl.418" class="">energy</span> <span id=":4zl.419" class="">cosmic</span> <span id=":4zl.420" class="">rays</span> </div>

<div class="gmail_extra"><br /><span id=":4zl.421" class="">after</span> 10 <span id=":4zl.422" class="">years</span> <span id=":4zl.423" class="">of</span> <span id=":4zl.424" class="">operation</span> <span id=":4zl.425" class="">of</span> <span id=":4zl.426" class="">the</span> <span id=":4zl.427" class="">Pierre</span> <span id=":4zl.428" class="">Auger</span> <span id=":4zl.429" class="">Observatory</span> <span id=":4zl.430" class="">Since</span> <span id=":4zl.431" class="">the</span> <span id=":4zl.432" class="">first</span> <span id=":4zl.433" class="">detection</span> <span id=":4zl.434" class="">of</span> a <span id=":4zl.435" class="">cosmic</span> <span id=":4zl.436" class="">ray</span> <span id=":4zl.437" class="">particle</span> <span id=":4zl.438" class="">with</span> <span id=":4zl.439" class="">energy</span> <span id=":4zl.440" class="">in</span> <span id=":4zl.441" class="">excess</span> <span id=":4zl.442" class="">of</span> 1020 <span id=":4zl.443" class="">eV</span> <span id=":4zl.444" class="">by</span> J. <span id=":4zl.445" class="">Linsley</span> <span id=":4zl.446" class="">at</span> <span id=":4zl.447" class="">the</span> <span id=":4zl.448" class="">Volcano</span> <span id=":4zl.449" class="">Ranch</span> <span id=":4zl.450" class="">in</span> 1963, <span id=":4zl.451" class="">the</span> <span id=":4zl.452" class="">origin</span> <span id=":4zl.453" class="">of</span> <span id=":4zl.454" class="">these</span> <span id=":4zl.455" class="">particles</span>, <span id=":4zl.456" class="">the</span> <span id=":4zl.457" class="">most</span> <span id=":4zl.458" class="">energetic</span> <span id=":4zl.459" class="">produced</span> <span id=":4zl.460" class="">in</span> <span id=":4zl.461" class="">nature</span>, <span id=":4zl.462" class="">is</span> <span id=":4zl.463" class="">an</span> <span id=":4zl.464" class="">enduring</span> <span id=":4zl.465" class="">problem</span> <span id=":4zl.466" class="">in</span> Astro-<span id=":4zl.467" class="">Particle</span> <span id=":4zl.468" class="">Physics</span>. <span id=":4zl.469" class="">While</span> <span id=":4zl.470" class="">the</span> <span id=":4zl.471" class="">energy</span> <span id=":4zl.472" class="">spectrum</span> <span id=":4zl.473" class="">and</span> <span id=":4zl.474" class="">the</span> <span id=":4zl.475" class="">chemical</span> <span id=":4zl.476" class="">composition</span> <span id=":4zl.477" class="">measurements</span> <span id=":4zl.478" class="">provide</span> <span id=":4zl.479" class="">constraints</span> <span id=":4zl.480" class="">helping</span> <span id=":4zl.481" class="">in</span> <span id=":4zl.482" class="">inferring</span> <span id=":4zl.483" class="">properties</span> <span id=":4zl.484" class="">of</span> <span id=":4zl.485" class="">the</span> <span id=":4zl.486" class="">acceleration</span> <span id=":4zl.487" class="">processes</span>, <span id=":4zl.488" class="">the</span> <span id=":4zl.489" class="">identification</span> <span id=":4zl.490" class="">of</span> <span id=":4zl.491" class="">the</span> <span id=":4zl.492" class="">sources</span> can <span id=":4zl.493" class="">only</span> be <span id=":4zl.494" class="">achieved</span> <span id=":4zl.495" class="">by</span> <span id=":4zl.496" class="">capturing</span> <span id=":4zl.497" class="">in</span> <span id=":4zl.498" class="">the</span> <span id=":4zl.499" class="">arrival</span> <span id=":4zl.500" class="">directions</span> a <span id=":4zl.501" class="">pattern</span> <span id=":4zl.502" class="">suggestive</span> <span id=":4zl.503" class="">in</span> <span id=":4zl.504" class="">an</span> <span id=":4zl.505" class="">evident</span> <span id=":4zl.506" class="">way</span> <span id=":4zl.507" class="">of</span> a <span id=":4zl.508" class="">class</span> <span id=":4zl.509" class="">of</span> <span id=":4zl.510" class="">astrophysical</span> <span id=":4zl.511" class="">objects</span>. <span id=":4zl.512" class="">This</span> <span id=":4zl.513" class="">remains</span> <span id=":4zl.514" class="">however</span> a <span id=":4zl.515" class="">difficult</span> <span id=":4zl.516" class="">task</span>, <span id=":4zl.517" class="">mostly</span> <span id=":4zl.518" class="">because</span> <span id=":4zl.519" class="">of</span> <span id=":4zl.520" class="">the</span> <span id=":4zl.521" class="">very</span> <span id=":4zl.522" class="">small</span> <span id=":4zl.523" class="">value</span> <span id=":4zl.524" class="">of</span> <span id=":4zl.525" class="">the</span> <span id=":4zl.526" class="">cosmic</span> <span id=":4zl.527" class="">rays</span> <span id=":4zl.528" class="">intensity</span> <span id=":4zl.529" class="">at</span> <span id=":4zl.530" class="">Earth</span> <span id=":4zl.531" class="">at</span> <span id=":4zl.532" class="">high</span> <span id=":4zl.533" class="">energy</span> (<span id=":4zl.534" class="">of</span> <span id=":4zl.535" class="">the</span> <span id=":4zl.536" class="">order</span> ∼ 3 × 10−1 km−2 sr−1 yr−1 <span id=":4zl.537" class="">above</span> 1018 <span id=":4zl.538" class="">eV</span>). <span id=":4zl.539" class="">To</span> <span id=":4zl.540" class="">collect</span> <span id=":4zl.541" class="">an</span> <span id=":4zl.542" class="">increased</span> <span id=":4zl.543" class="">in</span> flux <span id=":4zl.544" class="">of</span> <span id=":4zl.545" class="">events</span>, a <span id=":4zl.546" class="">jump</span> <span id=":4zl.547" class="">in</span> <span id=":4zl.548" class="">cumulated</span> <span id=":4zl.549" class="">exposure</span> as <span id=":4zl.550" class="">well</span> as <span id=":4zl.551" class="">improved</span> <span id=":4zl.552" class="">instrumentation</span> <span id=":4zl.553" class="">have</span> <span id=":4zl.554" class="">been</span> <span id=":4zl.555" class="">achieved</span> <span id=":4zl.556" class="">in</span> <span id=":4zl.557" class="">the</span> <span id=":4zl.558" class="">past</span> <span id=":4zl.559" class="">decade</span>. <span id=":4zl.560" class="">The</span> <span id=":4zl.561" class="">Pierre</span> <span id=":4zl.562" class="">Auger</span> <span id=":4zl.563" class="">Observatory</span>, <span id=":4zl.564" class="">located</span> <span id=":4zl.565" class="">near</span> <span id=":4zl.566" class="">the</span> <span id=":4zl.567" class="">town</span> <span id=":4zl.568" class="">of</span> Malarg¨ue (Argentina) <span id=":4zl.569" class="">and</span> <span id=":4zl.570" class="">covering</span> <span id=":4zl.571" class="">an</span> <span id=":4zl.572" class="">area</span> <span id=":4zl.573" class="">of</span> ∼ 3000 km2 , <span id=":4zl.574" class="">is</span> <span id=":4zl.575" class="">allowing</span> <span id=":4zl.576" class="">since</span> 2004 a <span id=":4zl.577" class="">scrutiny</span> <span id=":4zl.578" class="">of</span> <span id=":4zl.579" class="">the</span> ultra <span id=":4zl.580" class="">high</span> <span id=":4zl.581" class="">energy</span> <span id=":4zl.582" class="">cosmic</span> <span id=":4zl.583" class="">ray</span> <span id=":4zl.584" class="">sky</span> (<span id=":4zl.585" class="">except</span> <span id=":4zl.586" class="">in</span> <span id=":4zl.587" class="">the</span> <span id=":4zl.588" class="">northern</span> <span id=":4zl.589" class="">most</span> <span id=":4zl.590" class="">quarter</span>) <span id=":4zl.591" class="">with</span> a total <span id=":4zl.592" class="">exposure</span> <span id=":4zl.593" class="">of</span> ∼ 7.6 × 104 km2 <span id=":4zl.594" class="">sr</span> <span id=":4zl.595" class="">yr</span>. <span id=":4zl.596" class="">The</span> <span id=":4zl.597" class="">Pierre</span> <span id=":4zl.598" class="">Auger</span> <span id=":4zl.599" class="">Observatory</span> <span id=":4zl.600" class="">allows</span> <span id=":4zl.601" class="">an</span> <span id=":4zl.602" class="">unprecedented</span> <span id=":4zl.603" class="">sensitivity</span> <span id=":4zl.604" class="">in</span> <span id=":4zl.605" class="">searching</span> <span id=":4zl.606" class="">for</span> <span id=":4zl.607" class="">anisotropies</span> <span id=":4zl.608" class="">in</span> <span id=":4zl.609" class="">the</span> <span id=":4zl.610" class="">arrival</span> <span id=":4zl.611" class="">direction</span> <span id=":4zl.612" class="">distribution</span> <span id=":4zl.613" class="">over</span> <span id=":4zl.614" class="">the</span> celestial <span id=":4zl.615" class="">sphere</span>. <span id=":4zl.616" class="">The</span> <span id=":4zl.617" class="">object</span> <span id=":4zl.618" class="">of</span> <span id=":4zl.619" class="">this</span> <span id=":4zl.620" class="">talk</span> <span id=":4zl.621" class="">is</span> <span id=":4zl.622" class="">to</span> <span id=":4zl.623" class="">review</span> <span id=":4zl.624" class="">the</span> <span id=":4zl.625" class="">different</span> <span id=":4zl.626" class="">searches</span> <span id=":4zl.627" class="">performed</span> <span id=":4zl.628" class="">after</span> 10 <span id=":4zl.629" class="">years</span> <span id=":4zl.630" class="">of</span> <span id=":4zl.631" class="">operations</span> <span id=":4zl.632" class="">of</span> <span id=":4zl.633" class="">the</span> <span id=":4zl.634" class="">Observatory</span>. </div>

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