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arXiv 2107.09680astro-ph.GA
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Fornax3D项目:行星状星云目录和对天炉座星系团的独立距离测量

The Fornax3D project: Planetary nebulae catalogue and independent distance measurements to Fornax cluster galaxies

T. W. Spriggs, M. Sarz, P. M. Galán-de Anta, R. Napiwotzki, S. Viaene, B. Nedelchev, L. Coccato, E. M. Corsini, K. Fahrion, J. Falcón-Barroso, D. A. Gadotti, E.… 展开作者

T. W. Spriggs, M. Sarz, P. M. Galán-de Anta, R. Napiwotzki, S. Viaene, B. Nedelchev, L. Coccato, E. M. Corsini, K. Fahrion, J. Falcón-Barroso, D. A. Gadotti, E. Iodice, M. Lyubenova, I. Martín-Navarro, R. M. McDermid, L. Morelli, F. Pinna, G. van de Ven, P. T. de Zeeuw, L. Zhu

摘要:

河外行星状星云(PNe)提供了一种方法来确定到其宿主星系的距离,这要归功于行星状星云光度函数(PNLF)的几乎通用的形状。精确的PNe距离测量依赖于获得良好采样的PNLF和观测到的PNe尺度与所包围的恒星质量的数量。这意味着要么放弃宽视场观测,要么把注意力集中在星系明亮的中心区域。在这项工作中,我们采取这第二种方法,并进行人口普查的PNE人口在中央地区的星系在天炉座星系团,使用VLT/MUSE数据的早期类型的星系观测过程中的天炉座3D调查。使用这样的积分场光谱观测仔细分离星云发射从恒星连续体,我们隔离[OIII] 5007感兴趣的源,过滤掉未解决的冒名顶替源或运动学异常值,并提出了一个目录的1350个独特的PNe源在21个早期类型的星系,其中包括他们的位置,[OIII] 5007的视星等,和视线速度。使用每个星系内编目的PNe,我们提出了独立推导的距离估计的基础上,适合整个观察到的PNLF观察,同时仔细占PNe检测不完整。通过这些单独的测量,我们得出了到天炉座星团本身的平均距离为19.86 $\pm$ 0.32 Mpc($μ_{PNLF}$ = 31.49 $\pm$ 0.04等)。我们的PNLF距离测量结果与以前基于表面亮度波动的距离一致,发现这两种方法之间没有显着的系统偏移,否则在以前的研究中报告。

英文摘要:

Extragalactic planetary nebulae (PNe) offer a way to determine the distance to their host galaxies thanks to the nearly universal shape of the planetary nebulae luminosity function (PNLF). Accurate PNe distance measurements rely on obtaining well-sampled PNLFs and the number of observed PNe scales with the encompassed stellar mass. This means either disposing of wide-field observations or focusing on the bright central regions of galaxies. In this work we take this second approach and conduct a census of the PNe population in the central regions of galaxies in the Fornax cluster, using VLT/MUSE data for the early-type galaxies observed over the course of the Fornax3D survey. Using such integral-field spectroscopic observations to carefully separate the nebular emission from the stellar continuum, we isolated [OIII] 5007 Å sources of interest, filtered out unresolved impostor sources or kinematic outliers, and present a catalogue of 1350 unique PNe sources across 21 early-type galaxies, which includes their positions, [OIII] 5007 Å line magnitudes, and line-of-sight velocities. Using the PNe catalogued within each galaxy, we present independently derived distance estimates based on the fit to the entire observed PNLF observed while carefully accounting for the PNe detection incompleteness. With these individual measurements, we arrive at an average distance to the Fornax cluster itself of 19.86 $\pm$ 0.32 Mpc ($μ_{PNLF}$ = 31.49 $\pm$ 0.04 mag). Our PNLF distance measurements agree well with previous distances based on surface brightness fluctuations, finding no significant systematic offsets between the two methods as otherwise reported in previous studies.

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