论文标题
斯隆数字天空调查中的银河系对齐与周围结构
Galaxy Alignments with Surrounding Structure in the Sloan Digital Sky Survey
论文作者
论文摘要
使用Sloan数字天空调查（SDSS）遗产调查中的数据，我们研究了发光星系与光谱数据与仅具有光度数据的星系定义的光谱较大尺度结构的对齐。我们发现，来自红色序列的星系具有统计上显着的趋势，即它们的表观长轴与预测的周围结构平行。红色星系比我们样本的中位数（$ m_r <-21.78 $）具有平均平均值角$ \langleφ\ rangle <45^{\ circ} $的平均平均值，表示优先的并行对准，在预计的0.1 \ 0.1 \ n le中，<45^{\ circ} $。 7.5 \，\ Mathrm {MPC} $。 fainter红色星系具有$ \langleφ\ rangle <45^{\ circ} $，在显着级别$>4.3σ$ af scales $ 1 \，\ mathrm {mpc} <r_p} <r_p <3 \ 3 \ \，\ mathrm {mpc} $。在预计的量表$ r_p = 3.0 \，\ mathrm {mpc} $上，平均对齐角稳步下降，随着$ M_R \ sillsim -22.5 $的发光度的增加，平均值降低，达到$ \langleφ\langleφ\ rangle = rangle = 40.49^$ cirp} $ 0.56^{ （$ m_r \ sim -23.57 $）。来自蓝色序列的星系对它们的轴与大规模结构保持一致的统计学上没有显着的趋势，而不论星系光度如何。高密度区域中的星系在低密度区域的星系中没有显示出统计学上的显着差异。对于微弱的蓝色，发光的蓝色，微弱的红色和发光的红色子集，这是正确的。
Using data from the Sloan Digital Sky Survey (SDSS) Legacy Survey, we study the alignment of luminous galaxies with spectroscopic data with the surrounding larger-scale structure as defined by galaxies with only photometric data. We find that galaxies from the red sequence have a statistically significant tendency for their apparent long axes to align parallel to the projected surrounding structure. Red galaxies more luminous than the median of our sample ($M_r < -21.78$) have a mean alignment angle $\langle Φ\rangle < 45^{\circ}$, indicating preferred parallel alignment, at a significance level $>4.5 σ$ on projected scales $0.1\,\mathrm{Mpc} < r_p \leq 7.5\,\mathrm{Mpc}$. Fainter red galaxies have $\langle Φ\rangle < 45^{\circ}$ at a significance level $>4.3σ$ at scales $1\,\mathrm{Mpc} < r_p < 3\,\mathrm{Mpc}$. At a projected scale $r_p = 3.0\,\mathrm{Mpc}$, the mean alignment angle decreases steadily with increasing luminosity for red galaxies with $M_r \lesssim -22.5$, reaching $\langle Φ\rangle = 40.49^{\circ} \pm 0.56^{\circ}$ for the most luminous one percent ($M_r \sim -23.57$). Galaxies from the blue sequence show no statistically significant tendency for their axes to align with larger-scale structure, regardless of galaxy luminosity. Galaxies in higher-density regions do not show a statistically significant difference in mean alignment angle from galaxies in lower-density regions; this holds true for the faint blue, luminous blue, faint red, and luminous red subsets.
