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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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An extremely soft and weak fast X-ray transient associated with a luminous supernovaстатья
- Авторы: Li W X., Zhu Z.P., Zou X.Z., Geng J.J., Liu L.D., Wang Y.H., Li R Z., Xu D., Sun H., Wang X.F.
- Журнал: eprint arXiv:astro-ph
- Том: 2504
- Год издания: 2015
- Первая страница: 1
- Последняя страница: 54
- Номер статьи: 17034
- Аннотация: Long gamma-ray bursts (LGRBs), including their subclasses of low-luminosity GRBs (LL-GRBs) and X-ray flashes (XRFs) characterized by low spectral peak energies, are known to be associated with broad-lined Type Ic supernovae (SNe Ic-BL), which result from the core collapse of massive stars that lose their outer hydrogen and helium envelopes. However, the soft and weak end of the GRB/XRF population remains largely unexplored, due to the limited sensitivity to soft X-ray emission. Here we report the discovery of a fast X-ray transient, EP250108a, detected by the Einstein Probe (EP) in the soft X-ray band at redshift z=0.176, which was followed up by extensive multiband observations. EP250108a shares similar X-ray luminosity as XRF 060218, the prototype of XRFs, but it extends GRBs/XRFs down to the unprecedentedly soft and weak regimes, with its E_peak≲1.8 keV and E_iso≲1049 erg, respectively. Meanwhile, EP250108a is found to be associated with SN2025kg, one of the most luminous and possibly magnetar-powered SNe Ic-BL detected so far. Modeling of the well-sampled optical light curves favors a mildly relativistic outflow as the origin of this event. This discovery demonstrates that EP, with its unique capability, is opening a new observational window into the diverse outcomes of death of massive stars.