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NORTHERN DWARF AND LOW SURFACE BRIGHTNESS GALAXIES. V. THE SCALING ANALYSIS

机译:北矮星和低表面亮度星系。五,标度分析

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We have analyzed with the scaling formalism a statistical sample of northern dwarf and low surface brightness (LSB) galaxies with complete redshift information and such that δ ≥ 0° and b ≥ 40°. We subdivide the statistical sample into volume-limited samples and carry out the scaling analysis separately for dwarf and LSB galaxies. We then compare our results with those for bright galaxies (m_B ≤ 14.5) from the Center for Astrophysics (CfA) survey in the same volume-limited samples. The scaling formalism allows a separate analysis of regions with different density ranges. When galaxies in clusters are excluded, the null hypothesis that dwarf and LSB galaxies on the one hand, and bright galaxies on the other, trace the same density field can be ruled out at a 95% confidence level for both high- and moderate-density regions. We find bright galaxies to be more clustered than dwarf and LSB galaxies. The difference is not statistically significant for very low density regions, and in the region of the Local Supercluster, presumably because the redshift distances are more affected by peculiar velocities in the latter case. These results are not sensitive to changes in the absolute magnitude limit of the CfA subsamples, the intrinsic diameters of dwarf-LSB galaxies, and the morphological type of bright galaxies. The difference in the clustering properties between bright and dwarf-LSB galaxies increases considerably in the Local Supercluster when galaxies in the Virgo cluster are included. The result that LSB dwarfs are less clustered than bright galaxies is similar to that obtained for blue compact galaxies (BCGs), supporting the hypothesis that BCGs are LSB dwarfs undergoing intense bursts of star formation.
机译:我们用比例尺形式主义分析了北矮星系和低表面亮度(LSB)星系的统计样本,该星系具有完整的红移信息,并且δ≥0°和b≥40°。我们将统计样本细分为体积受限的样本,并分别对矮星系和LSB星系进行缩放分析。然后,我们将我们的结果与来自同一天数有限的样本中的天体物理学中心(CfA)调查的明亮星系(m_B≤14.5)的结果进行比较。缩放形式主义允许对具有不同密度范围的区域进行单独分析。如果排除星团中的星系,则对于高密度和中密度,在95%的置信水平下,可以排除一方面是矮星系和LSB星系,另一方面是明亮星系的零假设。地区。我们发现明亮的星系比矮星系和LSB星系更聚类。对于非常低的密度区域以及在本地超级集群区域中,该差异在统计上并不显着,大概是因为在后一种情况下,红移距离更受特殊速度的影响。这些结果对CfA子样本的绝对大小限制,矮LSB星系的内在直径以及明亮星系的形态类型的变化不敏感。当包括处女座星团中的星系时,在本地超级集群中,亮LSB和矮LSB星系之间的星团性质差异大大增加。 LSB矮星比明亮星系少聚类的结果与蓝色紧凑星系(BCG)获得的结果相似,这支持了BCG是经历强烈的恒星爆发的LSB矮星的假设。

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