title   
  

Detailed investigations of the dimmest bursts from two magnetars, SGR J0501+4516 and SGR J1550-5418

Lin, Lin and Göğüş, Ersin and Kaneko Göğüş, Yuki and Kouveliotou, Chryssa (2013) Detailed investigations of the dimmest bursts from two magnetars, SGR J0501+4516 and SGR J1550-5418. Astrophysical Journal, 778 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

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Official URL: http://dx.doi.org/10.1088/0004-637X/778/2/105

Abstract

We applied the Bayesian blocks representation technique to search for the dimmest bursts from two magnetars: we identified 320 events from SGR J0501 + 4516 using a deep XMM-Newton observation and 404 bursts from SGR J1550-5418 using two Swift/X-Ray Telescope pointings. The fluence level of our sample for both sources is about one to two orders of magnitude lower than earlier studies. We systematically investigated the morphological characteristics and duration distributions of these bursts, as these properties are directly obtained from their Bayesian blocks profiles. We also studied the spectral behavior of the dimmest bursts, which were grouped based on the morphological types and fluences. Our results helped us further differentiate the spectral nature of very dim bursts from that of the persistent emission, both fitted with physically motivated continuum emission models. Moreover, we generated the differential burst fluence distribution for these two magnetars in the lowest fluence regime.

Item Type:Article
Additional Information:Article Number: UNSP 105
Uncontrolled Keywords:pulsars: individual (SGR J0501+4516, SGR J1550-5418); stars: neutron; X-rays: bursts
Subjects:Q Science > QB Astronomy > QB460-466 Astrophysics
ID Code:22758
Deposited By:Ersin Göğüş
Deposited On:21 Jan 2014 22:06
Last Modified:21 Jan 2014 22:06

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