arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.5541astro-ph.GAastro-ph.CO
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玉夫座螺旋星系NGC 300中行星状星云候选者的星表

A catalog of planetary nebula candidates in the Sculptor spiral galaxy NGC 300

Miriam Pena, Jonnathan Reyes-Perez, Liliana Hernandez-Martinez, Miguel Perez-Guillen

摘要:

利用VLT和FORS 2摄谱仪在螺旋星系NGC 300的中心和外围两个区域获得的5007幅带内带外图像,对图像进行了分析,寻找发射线天体。特别是,我们寻找行星状星云(PN)的候选人,分析他们的分布和光度特性,进行后续光谱,并研究行星状星云光度函数,PNLF。在连续减影图像中,检测到大量的发射线对象。从这个样本中,我们选择了那些具有恒星外观且无法检测到中心恒星的天体作为PN候选对象。[OIII]5007仪器星等的测量和校准,通过使用分光光度数据从后续光谱。我们确定了一百多个PN候选人和一些紧凑的HII区域。PN样本是迄今为止该星系报告的最大样本。对于所有的对象,我们目前的坐标,仪器[OIII]5007星等和表观星云[OIII]5007通量和星等。[OIII]5007观测到的PNe(PNLF)的光度函数计算为整个样品和中心和郊区的样品。三个PNLF在不确定性方面相似。对于所有样本,我们将经验PNLF拟合到观察到的PNLF。根据我们对整个样本的最佳拟合,我们得到了视星等的最大值m*(5007)=22.019 \pm 0.022,我们得到了距离模量m(5007)-M(5007)= 26.29 {+0.12} {-0.22}等的初步估计,这与造父变星的最新值很好地吻合。

英文摘要:

[OIII]5007 on-band off-band images, obtained with the VLT and FORS2 spectrograph in two zones (center and outskirts) of the spiral galaxy NGC300, are analyzed searching for emission line objects. In particular we search for planetary nebula (PN) candidates to analyze their distribution and luminosity properties, to perform follow-up spectroscopy, and to study the planetary nebula luminosity function, PNLF. In the continuum-subtracted images, a large number of emission line objects were detected. From this sample we selected as PN candidates those objects with stellar appearance and no detectable central star. [OIII]5007 instrumental magnitudes were measured and calibrated by using spectrophotometric data from the follow-up spectroscopy. We identified more than a hundred PN candidates and a number of compact HII regions. The PN sample is the largest one reported for this galaxy so far. For all the objects we present coordinates, instrumental [OIII]5007 magnitudes and apparent nebular [OIII]5007 fluxes and magnitudes. The [OIII]5007 observed luminosity function for PNe (PNLF) was calculated for the whole sample and for the central and outskirts samples. The three PNLF are similar within uncertainties. We fit the empirical PNLF to the observed PNLF for all the samples. From our best fit for the whole sample we derived a maximum value for the apparent magnitudes of m*(5007)=22.019\pm0.022 and we obtained a tentative estimate of the distance modulus m(5007)-M(5007)= 26.29 {+0.12} {-0.22} mag, which agrees well with the recent value derived from Cepheid stars.

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