التفاصيل البيبلوغرافية
| العنوان: |
ON THE PUZZLING HIGH-ENERGY PULSATIONS OF THE ENERGETIC RADIO-QUIET γ-RAY PULSAR J1813–1246. |
| المؤلفون: |
Marelli, M., Harding, A., Pizzocaro, D., De Luca, A., Wood, K. S., Caraveo, P., Salvetti, D., Saz Parkinson, P. M., Acero, F. |
| المصدر: |
Astrophysical Journal; 11/10/2014, Vol. 795 Issue 2, p1-1, 1p |
| مصطلحات موضوعية: |
GAMMA ray bursts, PULSATING stars, PULSARS, NEUTRON stars, COMPACT objects (Astronomy) |
| مستخلص: |
We have analyzed the new deep XMM-Newton and Chandra observations of the energetic, radio-quiet pulsar J1813–1246. The X-ray spectrum is nonthermal, very hard, and absorbed. Based on spectral considerations, we propose that J1813 is located at a distance further than 2.5 kpc. J1813 is highly pulsed in the X-ray domain, with a light curve characterized by two sharp, asymmetrical peaks, separated by 0.5 in phase. We detected no significant X-ray spectral changes during the pulsar phase. We extended the available Fermi ephemeris to five years. We found two glitches. The γ-ray light curve is characterized by two peaks, separated by 0.5 in phase, with a bridge in between and no off-pulse emission. The spectrum shows clear evolution in phase, being softer at the peaks and hardening toward the bridge. Surprisingly, both X-ray peaks lag behind the γ-ray ones by a quarter of phase. We found a hint of detection in the 30-500 keV band with INTEGRAL, which is consistent with the extrapolation of both the soft X-ray and γ-ray emission of J1813. The unique X-ray and γ-ray phasing suggests a singular emission geometry. We discuss some possibilities within the current pulsar emission models. Finally, we develop an alternative geometrical model where the X-ray emission comes from polar cap pair cascades. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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