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arXiv 1007.2154astro-ph.GA
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M94(NGC 4736)中的新星率

The Nova Rate in M94 (NGC 4736)

T. Gueth, A. W. Shafter, K. A. Misselt

摘要:

对早期螺旋星系M94(NGC 4736)的多历元H $α$巡天已经完成,这是确定该星系新星率计划的一部分。在2005年至2007年期间的七个观测阶段中,共发现了四颗新星候选者。在对时间覆盖和空间完整性进行校正后,确定全球新星发生率为5.0 $^{+1.8}_{-1.4}$/年$^{-1}$。当$K$亮度由$B-K$颜色确定时,该速率对应于每年每10个$^{10} L_{\odot,K}$ 1.4个$\pm$ 0.5个新星的比亮度新星速率,或者当$K$亮度由2微米全天巡天导出时,该速率对应于每年每10个$^{10} L_{\odot,K}$ 1.5个$\pm$ 0.4个新星的比亮度新星速率。这些值略低于其他星系的测量新星率,通常位于$K$带中每10 $^{10} L_{\odot}$每年$2-3$新星的范围内。

英文摘要:

A multi-epoch H$α$ survey of the early-type spiral galaxy M94 (NGC 4736) has been completed as part of a program to establish the galaxy's nova rate. A total of four nova candidates were discovered in seven epochs of observation during the period from 2005 to 2007. After making corrections for temporal coverage and spatial completeness, a global nova rate of 5.0$^{+1.8}_{-1.4}$ yr$^{-1}$ was determined. This rate corresponds to a specific-luminosity nova rate of 1.4 $\pm$ 0.5 novae per year per 10$^{10} L_{\odot,K}$ when the $K$ luminosity is determined from the $B-K$ color, or 1.5 $\pm$ 0.4 novae per year per 10$^{10} L_{\odot,K}$ when the $K$ luminosity is derived from the Two Micron All Sky Survey. These values are slightly lower than that of other galaxies with measured nova rates, which typically lie in the range of $2-3$ novae per year per 10$^{10} L_{\odot}$ in the $K$ band.

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