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arXiv 1602.00758astro-ph.SRastro-ph.GAastro-ph.HE
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哈勃太空望远镜对M87中新星的巡天。I.光和颜色曲线、空间分布和新星率

A Hubble Space Telescope Survey for Novae in M87. I. Light and Color Curves, Spatial Distributions and the Nova Rate

Michael M. Shara, Trisha F. Doyle, Tod R. Lauer, David Zurek, J. D. Neill, Juan P. Madrid, Joanna Mikolajewska, D. L. Welch, Edward A. Baltz

摘要:

哈勃太空望远镜在10周的时间里拍摄了M87的中心部分,发现了32颗经典新星和9颗较暗的新星,可能是非常缓慢和/或共生的新星。在这一系列论文的第一篇中,我们将展示M87新星发现者图表,以及新星的光和颜色曲线。我们证明,上升和下降的时间,和颜色的M87新星是不相关的彼此和在星系中的位置。M87新星的空间分布遵循银河系的光线,这表明M87在食人事件中吸积的新星是混合的。保守地只使用32颗最亮的经典新星,我们得出M87的新星率:$363_{-45}^{+33}$新星/年。我们还推导出该星系的光度特定的经典新星率,这是$7.88_{-2.6}^{+2.3} /yr/ 10^{10}L_\odot,_{K}$。这两个比率都比过去报道的M87高出3-4倍,并且同样高于所有其他星系的报告。我们认为,大多数以前的地面调查的新星在外部星系,包括M87,错过了大多数微弱,快速新星,几乎所有的慢新星的中心附近的星系。

英文摘要:

The Hubble Space Telescope has imaged the central part of M87 over a 10 week span, leading to the discovery of 32 classical novae and nine fainter, likely very slow and/or symbiotic novae. In this first in a series of papers we present the M87 nova finder charts, and the light and color curves of the novae. We demonstrate that the rise and decline times, and the colors of M87 novae are uncorrelated with each other and with position in the galaxy. The spatial distribution of the M87 novae follows the light of the galaxy, suggesting that novae accreted by M87 during cannibalistic episodes are well-mixed. Conservatively using only the 32 brightest classical novae we derive a nova rate for M87: $363_{-45}^{+33}$ novae/yr. We also derive the luminosity-specific classical nova rate for this galaxy, which is $7.88_{-2.6}^{+2.3} /yr/ 10^{10}L_\odot,_{K}$. Both rates are 3-4 times higher higher than those reported for M87 in the past, and similarly higher than those reported for all other galaxies. We suggest that most previous ground-based surveys for novae in external galaxies, including M87, miss most faint, fast novae, and almost all slow novae near the centers of galaxies.

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