X-ray bursts from the transient magnetar candidate XTE J810-197

Peter M. Woods, Chryssa Kouveliotou, Fotis P. Gavriil, Victoria M. Kaspi, Mallory Roberts, Alaa Ibrahim, Craig B. Markwardt, Jean H. Swank, Mark H. Finger

    Research output: Contribution to journalArticle

    Abstract

    We have discovered four X-ray bursts, recorded with the Rossi X-ray Timing Explorer Proportional Counter Array between 2003 September and 2004 April, that we show to originate from the transient magnetar candidate XTE J1810-197. The burst morphologies consist of a short spike or multiple spikes lasting ∼ 1 s each, followed by extended tails of emission where the pulsed flux from XTE J1810-197 is significantly higher. The burst spikes are likely correlated with the pulse maxima, having a chance probability of a random phase distribution of 0.4%. The burst spectra are best fitted to a blackbody with temperatures 4-8 keV, considerably harder than the persistent X-ray emission. During the X-ray tails following these bursts, the temperature rapidly cools as the flux declines, maintaining a constant emitting radius after the initial burst peak. During the brightest X-ray tail, we detect a narrow emission line at 12.6 keV, with an equivalent width of 1.4 keV and a probability of chance occurrence of less than 4 × 10-6. The temporal and spectral characteristics of these bursts closely resemble the bursts seen from 1E 1048.1-5937 and a subset of the bursts detected from 1E 2259+586, thus establishing XTE J1810-197 as a magnetar candidate. The bursts detected from these three objects are sufficiently similar to one another, yet significantly different from those seen from soft gamma repeaters, that they likely represent a new class of bursts from magnetar candidates exclusive (thus far) to the anomalous X-ray pulsar-like sources.

    Original languageEnglish (US)
    Pages (from-to)985-997
    Number of pages13
    JournalAstrophysical Journal
    Volume629
    Issue number2 I
    DOIs
    StatePublished - Aug 20 2005

    Fingerprint

    magnetars
    bursts
    x rays
    spikes
    soft gamma repeaters
    temperature
    X Ray Timing Explorer
    proportional counters
    pulsars
    set theory
    occurrences

    Keywords

    • Pulsars: general
    • Stars: individual (XTE j1810-197)
    • X-rays: bursts

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Woods, P. M., Kouveliotou, C., Gavriil, F. P., Kaspi, V. M., Roberts, M., Ibrahim, A., ... Finger, M. H. (2005). X-ray bursts from the transient magnetar candidate XTE J810-197. Astrophysical Journal, 629(2 I), 985-997. https://doi.org/10.1086/431476

    X-ray bursts from the transient magnetar candidate XTE J810-197. / Woods, Peter M.; Kouveliotou, Chryssa; Gavriil, Fotis P.; Kaspi, Victoria M.; Roberts, Mallory; Ibrahim, Alaa; Markwardt, Craig B.; Swank, Jean H.; Finger, Mark H.

    In: Astrophysical Journal, Vol. 629, No. 2 I, 20.08.2005, p. 985-997.

    Research output: Contribution to journalArticle

    Woods, PM, Kouveliotou, C, Gavriil, FP, Kaspi, VM, Roberts, M, Ibrahim, A, Markwardt, CB, Swank, JH & Finger, MH 2005, 'X-ray bursts from the transient magnetar candidate XTE J810-197', Astrophysical Journal, vol. 629, no. 2 I, pp. 985-997. https://doi.org/10.1086/431476
    Woods PM, Kouveliotou C, Gavriil FP, Kaspi VM, Roberts M, Ibrahim A et al. X-ray bursts from the transient magnetar candidate XTE J810-197. Astrophysical Journal. 2005 Aug 20;629(2 I):985-997. https://doi.org/10.1086/431476
    Woods, Peter M. ; Kouveliotou, Chryssa ; Gavriil, Fotis P. ; Kaspi, Victoria M. ; Roberts, Mallory ; Ibrahim, Alaa ; Markwardt, Craig B. ; Swank, Jean H. ; Finger, Mark H. / X-ray bursts from the transient magnetar candidate XTE J810-197. In: Astrophysical Journal. 2005 ; Vol. 629, No. 2 I. pp. 985-997.
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    AU - Woods, Peter M.

    AU - Kouveliotou, Chryssa

    AU - Gavriil, Fotis P.

    AU - Kaspi, Victoria M.

    AU - Roberts, Mallory

    AU - Ibrahim, Alaa

    AU - Markwardt, Craig B.

    AU - Swank, Jean H.

    AU - Finger, Mark H.

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    N2 - We have discovered four X-ray bursts, recorded with the Rossi X-ray Timing Explorer Proportional Counter Array between 2003 September and 2004 April, that we show to originate from the transient magnetar candidate XTE J1810-197. The burst morphologies consist of a short spike or multiple spikes lasting ∼ 1 s each, followed by extended tails of emission where the pulsed flux from XTE J1810-197 is significantly higher. The burst spikes are likely correlated with the pulse maxima, having a chance probability of a random phase distribution of 0.4%. The burst spectra are best fitted to a blackbody with temperatures 4-8 keV, considerably harder than the persistent X-ray emission. During the X-ray tails following these bursts, the temperature rapidly cools as the flux declines, maintaining a constant emitting radius after the initial burst peak. During the brightest X-ray tail, we detect a narrow emission line at 12.6 keV, with an equivalent width of 1.4 keV and a probability of chance occurrence of less than 4 × 10-6. The temporal and spectral characteristics of these bursts closely resemble the bursts seen from 1E 1048.1-5937 and a subset of the bursts detected from 1E 2259+586, thus establishing XTE J1810-197 as a magnetar candidate. The bursts detected from these three objects are sufficiently similar to one another, yet significantly different from those seen from soft gamma repeaters, that they likely represent a new class of bursts from magnetar candidates exclusive (thus far) to the anomalous X-ray pulsar-like sources.

    AB - We have discovered four X-ray bursts, recorded with the Rossi X-ray Timing Explorer Proportional Counter Array between 2003 September and 2004 April, that we show to originate from the transient magnetar candidate XTE J1810-197. The burst morphologies consist of a short spike or multiple spikes lasting ∼ 1 s each, followed by extended tails of emission where the pulsed flux from XTE J1810-197 is significantly higher. The burst spikes are likely correlated with the pulse maxima, having a chance probability of a random phase distribution of 0.4%. The burst spectra are best fitted to a blackbody with temperatures 4-8 keV, considerably harder than the persistent X-ray emission. During the X-ray tails following these bursts, the temperature rapidly cools as the flux declines, maintaining a constant emitting radius after the initial burst peak. During the brightest X-ray tail, we detect a narrow emission line at 12.6 keV, with an equivalent width of 1.4 keV and a probability of chance occurrence of less than 4 × 10-6. The temporal and spectral characteristics of these bursts closely resemble the bursts seen from 1E 1048.1-5937 and a subset of the bursts detected from 1E 2259+586, thus establishing XTE J1810-197 as a magnetar candidate. The bursts detected from these three objects are sufficiently similar to one another, yet significantly different from those seen from soft gamma repeaters, that they likely represent a new class of bursts from magnetar candidates exclusive (thus far) to the anomalous X-ray pulsar-like sources.

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