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arXiv 2004.10665astro-ph.HE
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XMM-牛顿档案数据中z=0.092的超新星候选者

A Supernova Candidate at z=0.092 in XMM-Newton Archival Data

G. Novara, P. Esposito, A. Tiengo, G. Vianello, R. Salvaterra, A. Belfiore, A. De Luca, P. D'Avanzo, J. Greiner, M. Scodeggio, S. Rosen, C. Delvaux, E. Pian, S.… 展开作者

G. Novara, P. Esposito, A. Tiengo, G. Vianello, R. Salvaterra, A. Belfiore, A. De Luca, P. D'Avanzo, J. Greiner, M. Scodeggio, S. Rosen, C. Delvaux, E. Pian, S. Campana, G. Lisini, S. Mereghetti, G. L. Israel

摘要:

在EXTraS项目的XMM-Newton档案中搜索X射线瞬变的过程中,我们发现了一个新的X射线源,仅在2011年6月21日进行的约21小时观测的约5分钟间隔内检测到(EXMM 023135.0-603743,随机泊松波动的概率:~ $1.4\times10^{-27}$)。通过专门的后续观测,我们发现它的位置与红移为$z=0.092\pm0.003$($d=435\pm15$ Mpc)的恒星形成星系(SFR = 1-2 $M_\odot$ yr $^{-1}$)一致。在这个红移,在瞬态事件期间释放的能量是$2.8\times10^{46}$ erg,在0.3-10 keV的能带(在源静止帧中)。瞬变的光度,连同它的光谱和时间特性,使EXMM 023135.0-603743成为SN 2008 D相关X射线瞬变的一个引人注目的模拟物,SN 2008 D是在对附近($d=27$ Mpc)超新星丰富的星系NGC 2770进行Swift/XRT观测时发现的。我们解释的XMM-牛顿事件作为一个超新星冲击爆发或早期茧,并表明,我们的偶然发现是兼容的核心塌陷超新星的光学观测和远高于潮汐破坏事件的速度。

英文摘要:

During a search for X-ray transients in the XMM-Newton archive within the EXTraS project, we discovered a new X-ray source that is detected only during a ~5 min interval of a ~21 h-long observation performed on 2011 June 21 (EXMM 023135.0-603743, probability of a random Poissonian fluctuation: ~$1.4\times10^{-27}$). With dedicated follow-up observations, we found that its position is consistent with a star-forming galaxy (SFR = 1-2 $M_\odot$ yr$^{-1}$) at redshift $z=0.092\pm0.003$ ($d=435\pm15$ Mpc). At this redshift, the energy released during the transient event was $2.8\times10^{46}$ erg in the 0.3-10 keV energy band (in the source rest frame). The luminosity of the transient, together with its spectral and timing properties, make EXMM 023135.0-603743 a gripping analog to the X-ray transient associated to SN 2008D, which was discovered during a Swift/XRT observation of the nearby ($d=27$ Mpc) supernova-rich galaxy NGC 2770. We interpret the XMM-Newton event as a supernova shock break-out or an early cocoon, and show that our serendipitous discovery is compatible with the rate of core-collapse supernovae derived from optical observations and much higher than that of tidal disruption events.

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