MG14 - Talk detail |
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Participant |
Coti Zelati, Francesco | |||||||
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Institution |
Anton Pannekoek Institute for Astronomy - Postbus 94249 - Amsterdam - - Paesi Bassi | |||||||
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Session |
NS5 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
The X-Ray Outburst Of The Galactic Centre Magnetar During The First 1.5 Year | |||||
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Abstract |
In 2013 April a new magnetar, SGR 1745−2900, was discovered as it entered an outburst at an angular distance of only 2.4 arcsec from Sagittarius A*, the supermassive black hole at the centre of the Milky Way. The new source was detected both in the radio and X-ray bands, with a peak X-ray luminosity L_X ~ 5 × 10^{35} erg s^{−1}. I will present the results of the long-term Chandra (25 observations) and XMM–Newton (eight observations) X-ray monitoring campaign of SGR 1745−2900, from the onset of the outburst in 2013 April until 2014 September. This unprecedented data set has unveiled an extremely slow flux decay for the source, and a rather inefficient surface cooling. I will show how starquake-induced crustal cooling models alone have difficulty in explaining the prolonged high luminosity of the source for the first ~200 days of its outburst. Additional heating of the star surface from currents flowing in a twisted magnetic bundle is probably playing an important role in the outburst evolution. |
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