Multipole alignment in the large-scale distribution of spin direction of spiral galaxies
Lior Shamir
备注:
This is a preliminary unsubmitted/unpublished draft. The accepted/published version of this paper is: Shamir, L., Patterns of galaxy spin directions in SDSS and Pan-STARRS show parity violation and multipoles, Astrophysics and Space Science, 365, 136, 2020. Please note the differences between this version and the published version
Previous observations have suggested non-random distribution of spin directions of galaxies at scales far larger than the size of a supercluster. Here I use $\sim1.7\cdot10^5$ spiral galaxies from SDSS and $3.3\cdot10^4$ spiral galaxies from Pan-STARRS to analyze the distribution of galaxy spin patterns of spiral galaxies as observed from Earth. The analysis shows in both SDSS and Pan-STARRS that the distribution of galaxy spin directions forms a non-random pattern, and can be fitted to a dipole axis in probability much higher than mere chance. These observations agree with previous findings, but are based on more data and two different telescopes. The analysis also shows that the distribution of galaxy spin directions fits a large-scale multipole alignment, with best fit to quadrupole alignment with probability of $\sim6.9σ$ to have such distribution by chance. Comparison of two separate datasets from SDSS and Pan-STARRS such that the galaxies in both datasets have similar redshift distribution provides nearly identical quadrupole patterns.
Spin alignments of spiral galaxies within the large-scale structure from SDSS DR7
利用Sloan数字巡天数据发布7(SDSS DR 7)和星系动物园2(GZ 2)中的一组旋涡星系,研究了旋涡星系的自旋轴与周围大尺度结构的排列,其特征是利用一定质量阈值以上的星系群数据重建的大尺度潮汐场.我们发现,只有自旋轴有微弱的倾向,是对齐(或垂直于)本地潮汐张量的中(或短)轴。信号是最强的\cluster环境中的所有三个特征值的本地潮汐张量是积极的。与N体模拟中得到的晕自旋与局域潮汐场的一致性相比,上述观测结果与晕内区自旋的一致性最好,表明盘物质追踪了内区暗物质晕的角动量.
Multi-band ALMA Polarization Observations of BHB07-11 Reveal Aligned Dust Grains in Complex Spiral Arm Structures
University of Illinois(伊利诺伊大学);Carnegie Institution for Science(卡内基科学研究所);University of Virginia(弗吉尼亚大学);National Radio Astronomy Observatory(美国国家射电天文台);Worcester State University(伍斯特州立大学);Instituto Argentino de Radioastronomía, CCT-La Plata (CONICET)(阿根廷射电天文研究所,拉普拉塔中心(阿根廷科学研究委员会));Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata(拉普拉塔国立大学天文与地球物理学院);Zhejiang University(浙江大学);Seoul National University(首尔大学)
Galaxy Spin Alignment with Tidal Fields in the SDSS-IV MaNGA Survey
Institute of Astronomy and Astrophysics, Academia Sinica(中央研究院天文及天文物理研究所);Kavli IPMU (WPI), UTIAS, The University of Tokyo(理化学研究所 Kavli 宇宙物理学与数学国际中心(WPI)、东京大学宇宙线研究所)
CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303
作为近星系CO多线成像(COMING)计划的一部分,我们给出了对邻近棒旋星系NGC 4303的$^{12}$ CO($J$ = 1 - 0)和$^{13}$ CO($J$ =1-0)同步映射的结果.棒旋星系在棒区的恒星形成效率(SFE)通常比旋臂低。本文利用CO数据结合档案远紫外和24 $μ$ m数据研究了银盘内8个不同区域分子气体$n(\rm{H}_2)$的SFE和体积密度之间的关系。我们证实,在酒吧区的SFE是低于39%,在旋臂。此外,在各个区域的光谱进行速度对齐堆叠分析。作为叠加的结果,$^{12}$ CO与$^{13}$ CO的积分强度比($R_{12/13}$)范围为10至17。通过对$R_{12/13}$的非局域热力学平衡(non-LTE)分析,确定了分子气体的动力学温度,导出了$n(\rm{H}_2)$.横杠内$n(\rm{H}_2)$密度比臂内低31-37%,SFE与$n(\rm{H}_2)$之间有较强的正相关,相关系数为$\sim 0.8$。此外,我们还发现了$n(\rm{H}_2)$对分子间云速度色散($ΔV/ \sin i$)的依赖性。具体地,当$ΔV/ \sin i < 100$ km是$^{-1}$时,$n(\rm{H}_2)$随着$ΔV/ \sin i$的增加而增加。另一方面,当$ΔV/ \sin i > 100$ km s $^{-1}$时,$n(\r…
Where Galaxies Point: First Measurement of the Large-Scale Axial Intrinsic Alignment
Zhejiang University(浙江大学);Centro Brasileiro de Pesquisas Físicas(巴西物理研究中心);Universidade Federal do Rio de Janeiro(里约热内卢联邦大学);Observatório Nacional(国家天文台);Universidade Federal do Rio Grande(里奥格兰德联邦大学);Universidade Federal de Ouro Preto(欧罗普雷图联邦大学);INAF – Osservatorio Astronomico di Trieste(意大利国家天体物理研究所的里雅斯特天文台)
How to augment cosmic shear measurements with radio polarimetry of galaxies?
University of California(加州大学);Perimeter Institute for Theoretical Physics(珀尔默特理论物理研究所);University of Melbourne(墨尔本大学);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室)