行星状星云光度函数和室女座、长蛇座I和后发座星团的距离
The Planetary Nebulae Luminosity Function and distances to Virgo, Hydra I and Coma clusters
摘要：
在10-15 Mpc距离内的星系中，行星状星云种群的光度函数在明亮的星等处有一个截止值，并且在不同的星系形态类型中观察到一个不变的函数形式。因此，它被用作早期和晚期星系的次级距离指示器。最近对最亮星系团（BCGs）中行星状星云种群的深入调查似乎表明，它们的光度函数偏离了在附近星系中观察到的。我们讨论了室女座这种偏差的证据，并指出哪些物理机制可能会改变一个行星状星云的信封和它的中央恒星的BCGs晕的演变。然后，我们讨论了初步结果的距离室女座，长蛇座I和后发座星系团的基础上观察到的行星状星云光度函数。
英文摘要：
The luminosity function of planetary nebulae populations in galaxies within 10-15 Mpc distance has a cut-off at bright magnitudes and a functional form that is observed to be invariant in different galaxy morphological types. Thus it is used as a secondary distance indicator in both early and late-type galaxies. Recent deep surveys of planetary nebulae populations in brightest cluster galaxies (BCGs) seem to indicate that their luminosity functions deviate from those observed in the nearby galaxies. We discuss the evidence for such deviations in Virgo, and indicate which physical mechanisms may alter the evolution of a planetary nebula envelope and its central star in the halo of BCGs. We then discuss preliminary results for distances for the Virgo, Hydra I and Coma clusters based on the observed planetary nebulae luminosity functions.
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