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arXiv 1603.04895astro-ph.HEastro-ph.SR
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M31中SN 1885(S And)残基的光学和UV光谱

Optical and UV Spectra of the Remnant of SN 1885 (S And) in M31

Robert A. Fesen, Kathryn E. Weil, Peter A. Hoeflich, Andrew J. Hamilton

摘要:

我们目前的光学和紫外光谱的SN 1885(S和),可见吸收对突出的仙女座星系(M31),使用哈勃太空望远镜的STIS摄谱仪探测超新星碎片的三维排列。使用两个方向的六个0.2”狭缝位置拍摄的覆盖2900至5700 A的光谱显示了广泛的Ca II吸收,蓝色和红色径向速度至少达到11,500 km/s,与HST Ca II图像的S和一致。增强的钙II吸收被认为是2000至6000公里/秒之间的暗示钙II丰富的壳。光谱还显示出强烈的、不对称的Ca I 4227 A吸收延伸到+12,400 km/s,以及速度在2000和9000 km/s之间的壳层中的弱Fe I 3720 A吸收。得到的紫外光谱显示弱的宽吸收短波长3000 A与模型预测一致。的STIS光谱,连同以前的HST图像,显示了分层结构,具有明确的富钙的外边缘指示延迟爆轰阶段。残骸的cluerous内富钙壳加上只有少数的富铁羽是不一样的形态预期从动态或暴力合并的情况。少量的富铁羽表明它们的形成在爆燃阶段的瑞利-泰勒不稳定性,但不太发达,没有延长混合预期从流体动力学计算。强瑞利-泰勒不稳定性的抑制可能是强磁场的结果。我们认为SN 1885是一个偏离中心的延迟爆炸,与SN 1986 g类似,是一个轻微亚发光的Ia型超新星。

英文摘要:

We present optical and ultraviolet spectra of SN 1885 (S And), visible in absorption against the bulge of the Andromeda galaxy (M31), using the Hubble Space Telescope's STIS spectrograph to probe the three dimensional arrangement of the supernova debris. Spectra covering 2900 to 5700 A taken using six 0.2" slit positions in two orientations show broad Ca II absorption with blue and red radial velocities out to at least 11,500 km/s, consistent with HST Ca II images of S And. Enhanced Ca II absorption is seen between 2000 to 6000 km/s suggestive of a Ca II-rich shell. The spectra also show strong, asymmetric Ca I 4227 A absorption extending out to +12,400 km/s, along with weak Fe I 3720 A absorption in a shell with velocities between 2000 and 9000 km/s. Ultraviolet spectra obtained revealed weak broad absorption shortward of 3000 A consistent with model predictions. The STIS spectra, together with previous HST images, show a layered structure with a well defined Ca-rich outer edge indicative of a delayed detonation phase. The remnant's clumpy inner Ca-rich shell plus only a handful of Fe-rich plumes is unlike morphologies expected from dynamical or violent merger scenarios. The small number of Fe-rich plumes suggest their formation during a deflagration phase by Rayleigh-Taylor instabilities but less well developed without extended mixing as expected from hydrodynamic calculations. The suppression of strong Rayleigh-Taylor instabilities is possibly the result of strong magnetic fields. We propose SN 1885 was an off-center, delayed detonation and slightly subluminous SN Ia similar to SN 1986g.

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