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arXiv 0906.4703astro-ph.CO
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室女星系团中漫射光与团内行星状星云的联系

The Connection Between Diffuse Light and Intracluster Planetary Nebulae in the Virgo Cluster

J. Christopher Mihos, Steven Janowiecki, John J. Feldmeier, Paul Harding, Heather Morrison

摘要:

我们比较了通过宽带成像在室女星系团中探测到的漫射团内光的分布与从搜索团内行星状星云(IPNe)中推断出的分布。我们发现两者在大尺度上(~ 100千秒差距)大致一致,但离散度很大(~ 1.3等/角秒^[2])。在较小的尺度(1 - 10千秒差距),相关性的存在或不存在显然取决于下伏表面亮度。在这些尺度上,我们发现在表面亮度较高的区域(μ V < ~27),主要是由大星系,如M87,M86和M84的晕。在这些情况下,我们可能追踪与星系相关的PNe,而不是真正的IPNe。在真实的团内区域,在较低的表面亮度下,光度和IPN候选者之间的相关性要弱得多。虽然宽带光和IPNe之间的相关性是基于恒星星族,各种统计,物理和方法学的影响可以发挥作用,以洗出这种相关性,并解释缺乏强相关性在较低的表面亮度发现这里。[删节]

英文摘要:

We compare the distribution of diffuse intracluster light detected in the Virgo Cluster via broadband imaging with that inferred from searches for intracluster planetary nebulae (IPNe). We find a rough correspondence on large scales (~ 100 kpc) between the two, but with very large scatter (~ 1.3 mag/arcsec^2). On smaller scales (1 -- 10 kpc), the presence or absence of correlation is clearly dependent on the underlying surface brightness. On these scales, we find a correlation in regions of higher surface brightness (mu_V < ~27) which are dominated by the halos of large galaxies such as M87, M86, and M84. In those cases, we are likely tracing PNe associated with galaxies rather than true IPNe. In true intracluster fields, at lower surface brightness, the correlation between luminosity and IPN candidates is much weaker. While a correlation between broadband light and IPNe is expected based on stellar populations, a variety of statistical, physical, and methodological effects can act to wash out this correlation and explain the lack of a strong correlation at lower surface brightness found here. [abridged]

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