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Main Author:	Todd A. Thompson
Format:	Artículo científico
Language:	en
Published:	Universidad Nacional Autónoma de México 2007
Subjects:	Física, Astronomía y Matemáticas outflows stars: winds stars: neutron Gamma rays: bursts supernovae: general
Online Access:	https://www.redalyc.org/articulo.oa?id=57102709
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Assessing Millisecond Proto-Magnetars as GRB Central Engines Todd A. Thompson Física, Astronomía y Matemáticas outflows stars: winds stars: neutron Gamma rays: bursts supernovae: general Magnetars are a sizable subclass of the neutron star census. Their very high magnetic field strengths arethought to be a consequence of rapid (millisecond) rotation at birth in a successful core-collapse supernova.In their first tens of seconds of existence, magnetars transition from hot, extended "proto-"magnetars to thecooled and magnetically-dominated objects we identify ~10 4 years later as Soft Gamma-ray Repeaters (SGRs)and Anamolous X-ray Pulsars (AXPs). Millisecond proto-magnetar winds during this cooling phase likewisetransition from non-relativistic and thermally-driven to magneto-centrifugally-driven, and finally to relativistic and Poynting-flux dominated. Here we review the basic considerations associated with that transition. In particular, we discuss the spindown of millisecond proto-magnetars throughout the Kelvin-Helmholtz cooling epoch. Because of their large reservoir of rotational energy, their association with supernovae, and the fact that their winds are expected to become highly relativistic in the seconds after their birth, proto-magnetarshave been suggested as the central engine of long-duration gamma ray bursts. We discuss some of the issuesand outstanding questions in assessing them as such. 2007 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57102709 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.27

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// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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