A New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton Photon Imaging Cameras

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dc.creatorGoldwurm, A.
dc.creatorBrion, E.
dc.creatorGoldoni, P.
dc.creatorFerrando, P.
dc.creatorDaigne, F.
dc.creatorDecourchelle, A.
dc.creatorWarwick, R. S.
dc.creatorPredehl, P.
dc.date2002-07-29
dc.date2002-12-02
dc.date.accessioned2026-07-07T11:28:57Z
dc.date.available2026-07-07T11:28:57Z
dc.descriptionSgr A*, the compact radio source, believed to be the counterpart of the massive black hole at the galactic nucleus, was observed to undergo rapid and intense flaring activity in X-rays with Chandra in October 2000. We report here the detection with XMM-Newton EPIC cameras of the early phase of a similar X-ray flare from this source, which occurred on September 4, 2001. The source 2-10 keV luminosity increased by a factor about 20 to reach a level of 4 10^{34} erg s^{-1} in a time interval of about 900 s, just before the end of the observation. The data indicate that the source spectrum was hard during the flare. This XMM-Newton observation confirms the results obtained by Chandra and suggests that, in Sgr A*, rapid and intense X-ray flaring is not a rare event. This can constrain the emission mechanism models proposed for this source, and also implies that the crucial multiwavelength observation programs planned to explore the behaviour of the radio/sub-mm and hard X-ray/gamma-ray emissions during the X-ray flares, have a good chance of success.
dc.description18 pages, 6 color figures, final version, accepted on October 24, 2002, to appear in ApJ, v584 n2 ApJ February 20, 2003 issue
dc.identifierhttps://arxiv.org/abs/astro-ph/0207620
dc.identifierhttp://arxiv.org/abs/astro-ph/0207620
dc.identifierAstrophys.J.584:751-757,2003
dc.identifierdoi:10.1086/345749
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/196564
dc.subjectAstrophysics
dc.titleA New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton Photon Imaging Cameras
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