Перегляд за Автор "Pajowska, Paulina"

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  • Ескіз
    Документ
    Investigation of the orientation of galaxies in clusters: the importance, methods and results of research
    (2019) Pajowska, Paulina; Godlowski, Wlodzimierz; Zhu, Zong-Hong; Popiela, Joanna; Panko, Olena O.; Flin, Piotr; Панько, Олена Олексіївна; Панько, Елена Алексеевна
    Various models of structure formation can account for various aspects of the galaxy formation process on different scales, as well as for various observational features of structures. Thus, the investigation of galaxies orientation constitute a standard test of galaxies formation scenarios since observed variations in angular momentum represent fundamental constraints for any model of galaxy formation. We have improved the method of analysis of the alignment of galaxies in clusters. Now, the method allows to analyze both position angles of galaxy major axes and two angles describing the spatial orientation of galaxies. The distributions of analyzed angles were tested for isotropy by applying different statistical tests. For sample of analyzed clusters we have computed the mean values of analyzed statistics, checking whether they are the same as expected ones in the case of random distribution of analyzed angles. The detailed discussion of this method has been performed. We have shown how to proceed in many particular cases in order to improve the statistical reasoning when analyzing the distribution of the angles in the observational data. Separately, we have compared these new results with those obtained from numerical simulations. We show how powerful is our method on the example of galaxy orientation analysis in 247 Abell rich galaxy clusters. We have found that the orientations of galaxies in analyzed clusters are not random. It means that we genuinely confirmed an existence of the alignment of galaxies in rich Abells’ galaxy clusters. This result is independent from the clusters of Bautz-Morgan types.
  • Ескіз
    Документ
    The Investigation of the Luminosity Function for Sample 6168 Galaxy Clusters
    (2018) Godlowski, Wlodzimierz; Popiela, Joanna; Biernacka, Monika; Bajan, Katarzyna; Panko, Olena O.; Pajowska, Paulina; Flin, Piotr; Панько, Олена Олексіївна; Панько, Елена Алексеевна
    The issue of construction of the luminosity function is an important problem for analysis of large scale structure statistics and interpretation of astronomical object counts In the present paper we discuss the the issure of the construction of the luminosity function for galaxy clusters. The problem is solved based on counting brightness of galaxies belonging to 6168 galaxy clusters selected from Panko & Flin (2006) Catalogue. We show that the galaxy clusters are characterized by the luminosity function signi cantly di erent than that obtained for both: individual optical galaxies and radiogalaxies. We discuss the signi cance of this result for the theories of the structure formation.
  • Ескіз
    Документ
    The Orientation of Galaxies in Galaxy Clusters
    (2010) Godlowski, Wlodzimierz; Pajowska, Paulina; Panko, Olena O.; Flin, Piotr; Панько, Олена Олексіївна; Панько, Елена Алексеевна
    We present an analysis of the spatial orientations of galaxies in 247 optically selected rich Abell clusters which have at least 100 members in the considered area.We investigated the relation between angles that give information about galaxy angular momenta and the number of members in each structure. The position angles of the galaxies’ major axes, as well as two angles describing the spatial orientation of the galaxy plane, were tested for isotropy by applying three different statistical tests. It is found that the values of the statistics increase with the amount of the galaxies’ members, which is equivalent to the existence of a relation between anisotropy and the number of galaxies in a cluster. The search for connection between the galaxies’ alignments and Bautz–Morgan (BM) morphological types of examined clusters showed a weak dependence. A statistically marginal relation between velocity dispersion and cluster richness was observed. In addition, it was found that the velocity dispersion decreases with BM type at almost 3σ level. These results show the dependence of alignments with respect to clusters’ richness, which can be regarded as an environmental effect.