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Exploring the Role of Globular Cluster Specific Frequency on the Nova Rates in Three Virgo Elliptical Galaxies

机译:探索球状星团的特定频率对三个处女座椭圆星系的新星率的作用

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摘要

It has been proposed that a galaxy's nova rate might be enhanced by the production of nova progenitor binaries in the dense cores of its globular clusters (GCs). To explore this idea, relative nova rates in three Virgo elliptical galaxies, M87, M49, and M84, which have significantly different GC specific frequencies (SN) of 14, 3.6, and 1.6, respectively, were measured over the course of 4 epochs spanning a period of 14 months. To simplify the analysis, observations of the nearly equidistant galaxies were made on the same nights, with the same integration times, and through the same filter (Hα), so that the relative numbers of novae discovered would reflect the relative nova rates. At the conclusion of our survey we found a total of 27 novae associated with M87, 37 with M49, and 19 with M84. After correcting for survey completeness, we found annual nova rates of 154_(-19)^(+23), 189_(-22)^(+26), and 95_(-14)^(+15), for M87, M49, and M84, respectively, corresponding to K-band luminosity-specific nova rates of 3.8 ± 1.0, 3.4 ± 0.6, and 3.0 ± 0.6 novae per year per 10^(10) L_K_⊙. The overall results of our study suggest that a galaxy's nova rate simply scales with its luminosity, and is insensitive to its GC specific frequency. Two novae, one in M87 and one in M84, were found to be spatially coincident with known GCs. After correcting for the mass fraction in GCs, we estimate that novae are likely enhanced relative to the field by at least an order of magnitude in the GC systems of luminous Virgo ellipticals.
机译:已经提出,通过在球状星团(GC)的密集核中产生新星祖先二进制数,可以提高星系的新星发生率。为了探索这个想法,在跨越四个历元的过程中,分别测量了三个处女座椭圆星系M87,M49和M84的相对新星发生率,它们分别具有14、3.6和1.6的显着不同的GC比频率(SN)。为期14个月。为了简化分析,在相同的夜晚,相同的积分时间和通过相同的滤镜(Hα)对近等距的星系进行了观测,因此发现的新星的相对数量将反映相对的新星速率。在调查结束时,我们发现总共有27条与M87相关的新星,37条与M49相关的新星和19条与M84相关的新星。校正调查的完整性后,我们发现M87,M49的年新星率分别为154 _(-19)^(+ 23),189 _(-22)^(+ 26)和95 _(-14)^(+ 15) ,和M84分别对应于每10 ^(10)L_K_ K每年K波段光度特定的新星发生率3.8±1.0、3.4±0.6和3.0±0.6新星。我们研究的总体结果表明,星系的新星率仅随其光度成比例变化,并且对它的GC特定频率不敏感。发现两个新星,一个在M87中,一个在M84中,与已知的GC在空间上重合。校正GC中的质量分数后,我们估计在发光的处女座椭圆形GC系统中,新星相对于磁场可能增强了至少一个数量级。

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