(Abridged) Galaxies with polar rings (PRGs) are a unique class of extragalactic objects allowing to investigate a wide range of problems, linked with the formation and evolution of galaxies, and to study the properties of their dark haloes. The progress in the study of PRGs is constrained by a small number of known objects of this type. Up to date, we can only attribute about two dozens of kinematically-confirmed galaxies to this class, mostly from Whitmore et al. (1990) catalogue. We present a new catalogue of PRGs based on the results of the original Galaxy Zoo project. Based on the preliminary classification of the Galaxy Zoo, we viewed more than 40000 images of the Sloan Digital Sky Survey (SDSS) and selected 275 galaxies, included in our catalogue. Our Sloan-based Polar Ring Catalog (SPRC) contains 70 galaxies that we classified as "the best candidates", among which we expect to have a very high proportion of true PRGs, and 115 good PRG candidates. 53 galaxies are classified as PRG related objects.We identified 37 galaxies that have their presumed polar rings seen almost face-on. The SPRC objects are on the average fainter and located further away than the galaxies from the catalog by Whitmore et al., although our catalogue does include dozens of new nearby candidate PRGs. The new catalogue significantly increases the number of genuine PRG candidates, and may serve as a good basis both for the further detailed study of individual galaxies, and for the statistical analysis of PRGs as a separate class of objects. We performed spectroscopic observations of six galaxies from the SPRC at the 6-m telescope. The existence of polar rings was confirmed in five galaxies, and one object appeared to be a projection of a pair of galaxies. Adding the literature data, we can already classify 10 galaxies from our catalogue to the kinematically-confirmed PRGs.
Comments on arXiv:1310.5067: "A response to `A self-consistent public catalogue of voids and superclusters in the SDSS Data Release 7 galaxy surveys' "
In this work we present a new catalogue of Cosmic Filaments obtained from the latest Sloan Digital Sky Survey (SDSS) public data. In order to detect filaments, we implement a version of the Subspace-Constrained Mean-Shift algorithm, boosted by Machine Learning techniques. This allows us to detect cosmic filaments as one-dimensional maxima in the galaxy density distribution. Our filament catalogue uses the cosmological sample of SDSS, including Data Release 16, so it inherits its sky footprint (aside from small border effects) and redshift coverage. In particular, this means that, taking advant…
A response to arXiv:1310.2791: A self-consistent public catalogue of voids and superclusters in the SDSS Data Release 7 galaxy surveys
最近,Nadathur和Hotchkiss(2013)提交了一篇论文,讨论了一个新的宇宙空洞目录。本文包括Sutter et al.(2012)中描述的关于空目录的声明。在本说明中,我们回应了这些说法,澄清了Sutter等人(2012)的文本与最新版本的目录之间的一些差异,并对我们的目录与Nadathur & Hotchkiss(2013)的目录之间的差异提供了一些评论。我们目录的所有更新和文档都可以在http://www.cosmicvoids.net上找到。
The properties of Brightest Cluster Galaxies in the SDSS DR6 adaptive matched filter cluster catalogue
我们研究了基于自适应匹配滤波器技术(AMF,Szabo等人,2010年)。我们的样本包括超过14300个星系的红移范围为0.1-0.3。我们测试的目录显示,它包括著名的BCGs在于SDSS足迹。我们的特征BCGs的r-波段光度和光学颜色,以及它们的红移趋势。特别是,我们定义和研究的蓝色BCGs的分数,即那些可能会错过基于颜色的聚类调查和目录。较富裕的集群往往有更明亮的BCG,但不那么占主导地位,比穷人的系统。我们的BCG中有4-9%的BCG在g-r色上至少比红序列在它们给定的红移上蓝0.3等。对于丰度高于50的簇,这样的分数降低到1-6%,其中3%的BCGs低于红色序列0.5等。初步的形态学研究表明,在较低的丰度蓝色部分的增加可能有一个不可忽视的贡献,从螺旋星系。我们表明,基于g-r红色序列或基于颜色u-r >2.2的切割的颜色选择可能导致错过大多数这样的蓝色BCGs。我们还将颜色分析扩展到紫外线范围,将我们的产品目录与Galex GR 4和GR 5的公开数据进行交叉匹配。我们显示了一个明确的相关性从光学红色序列的偏移量和紫外线过量。最后,我们将我们的目录与ACCEPT聚类样本(Cavagnolo等人,2009),并发现蓝色BCGs倾向于在低熵和短冷却时间的集群中。也就是说,蓝光可能是由于最近的恒星形成与冷却流提供的气体有关。(节略)
Projection effects, whereby galaxies along the line-of-sight to a galaxy cluster are mistakenly associated with the cluster halo, present a significant challenge for optical cluster cosmology. We use statistically representative spectral coverage of luminous galaxies to investigate how projection effects impact the low-redshift limit of the Sloan Digital Sky Survey (SDSS) redMaPPer galaxy cluster catalogue. Spectroscopic redshifts enable us to differentiate true cluster members from false positives and determine the fraction of candidate cluster members viewed in projection. Our main results c…
Comparing gravitational redshifts of SDSS galaxy clusters with the magnification redshift enhancement of background BOSS galaxies
对星系团质量函数演化的清晰测量可以从z < 0.5以下星系团质量的快速增长中显着提高我们对宇宙学的理解。在这里,我们研究的一致性集群目录选择SDSS通过应用两个独立的基于重力的方法,使用所有可用的光谱红移从DR 10版本。首先,我们分别在GMBCG和redMapper星表中检测到20,119和13,128个光谱红移的星系团的引力红移相关信号,其水平为$\sim - 10$ km s $^{-1}$。我们发现,这是一致的预期使用的丰富的质量关系的文献,并应用最近澄清的相对论和通量偏差修正后的幅度。这个信号也与Wen et al.(2012)的更大目录中最丰富的星团一致,对应于$M_{200m} \gtrsim 2 \times 10^{14}\,\mathrm{M}_\odot\,h^{-1}$,但是我们发现对于不太丰富的星团没有显著的引力红移信号,这可能与来自子结构和虚假星团检测的整体运动有关。其次,我们发现所有三个目录产生质量依赖的水平的透镜放大率的偏差,这提高了平均红移的通量选择的背景星系的BOSS调查。这种透镜效应的大小一般与调查中所主张的相应的财富-质量关系相一致。我们的结论是,所有的目录包括一个高比例的可靠的集群,GMBCG和redMapPer集群查找算法有利于更轻松的集群与一个有意义的引力红移信号,如预期的红色序列颜色选择的GMBCG和redMapPer样本。
The Clustering of the SDSS Main Galaxy Sample II: Mock galaxy catalogues and a measurement of the growth of structure from Redshift Space Distortions at $z=0.15$
4098 galaxy clusters to z~0.6 in the Sloan Digital Sky Survey equatorial Stripe 82
我们提出了一个星表的4098光度选择的星系团的中值红移<z>= 0.32在270平方度的“条纹82”的区域的斯隆数字巡天(SDSS),覆盖天球赤道南银河帽(-50 < RA < 59度,|Dec| < 1.25度)。由于该区域的多历元SDSS覆盖,ugriz测光比主要SDSS足迹内的单次扫描深约2个星等。我们利用这一点来检测星系团使用的算法,搜索统计上显着overdensities的星系在Voronoi镶嵌的投影天空。32%的星团至少有一个成员的光谱红移来自现有的公开数据(SDSS Data Release 7,2SLAQ & WiggleZ),其余的具有稳健的光度红移(在样本的中值红移处精确到约5-9%)。成员星系红移的加权平均值提供了一个相当准确的星系团红移的估计。集群目录是公开的,可供社区利用,以追求一系列科学目标。除了星团目录,我们还提供了一个18,295 V<21等类星体视线的链接目录,其碰撞参量在<3 Mpc的星团核心内,这些星团核心选自Veron等人(2010)的目录。背景类星体覆盖0.25 < z < 2,其中与团簇相关的MgII吸收线系统在光谱中是可检测的。
We present the Emission Line Galaxy (ELG) sample of the extended Baryon Oscillation Spectroscopic Survey (eBOSS) from the Sloan Digital Sky Survey IV Data Release 16 (DR16). After describing the observations and redshift measurement for the 269,243 observed ELG spectra over 1170 deg$^2$, we present the large-scale structure catalogues, which are used for the cosmological analysis. These catalogues contain 173,736 reliable spectroscopic redshifts between 0.6 and 1.1, along with the associated random catalogues quantifying the extent of observations, and the appropriate weights to correct for no…
In this paper we present the X-ray analysis of SDSS DR8 redMaPPer (SDSSRM) clusters using data products from the $XMM$ Cluster Survey (XCS). In total, 1189 SDSSRM clusters fall within the $XMM$-Newton footprint. This has yielded 456 confirmed detections accompanied by X-ray luminosity ($L_{X}$) measurements. Of the detected clusters, 382 have an associated X-ray temperature measurement ($T_{X}$). This represents one of the largest samples of coherently derived cluster $T_{X}$ values to date. Our analysis of the X-ray observable to richness ($λ$) scaling relations has demonstrated that scatter …
Groups in the Millennium Simulation and in SDSS DR7
比较了Millennium N-body模拟和Sloan数字巡天第七次数据发布(SDSS DR 7)星系和星系群星表,研究了星系群的性质和星系群中星系的分布。我们使用Tago等人分析SDSS数据时使用的相同的朋友的朋友方法,为千年半分析星系表构建模拟星系群星表。我们详细分析了集团光度,集团丰富度,维里半径,集团的大小和它们的均方根速度为四个体积有限的样品从观测和模拟。我们的结果表明,在所有的样本中,群的空间密度在一个数量级内一致,模拟星表与观测值之间具有相当好的一致性。对于更富有的群体,所有群体属性分布都具有相似的形状和幅度。对于星系对和小星系群,观测和模拟的星系群性质明显不同。此外,星系在小星系群中的空间分布是不同的:在星系群的外围,星系数分布并不一致,尽管在内部区域的一致性相对较好。分布的差异主要是由于SDSS样本的观测限制和半分析方法中产生过于紧凑和明亮的群体的问题。
We spectroscopically detected 838 likely, 448 probable, and 265 possible strong lens candidates within $\approx2$ million galaxy spectra contained within the extended Baryon Oscillation Spectroscopic Survey (eBOSS) from the sixteenth data release (DR16) of the Sloan Digital Sky Survey (SDSS). We apply the spectroscopic detection method of the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line Lens Survey (BELLS) and add Gaussian fit information, grading, additional inspection observables, and additional inspection methods to improve our selection method. We observed 477 candidates wi…
We produce 1000 realizations of synthetic clustering catalogues for each type of the tracers used for the baryon acoustic oscillation and redshift space distortion analysis of the Sloan Digital Sky Surveys-IV extended Baryon Oscillation Spectroscopic Survey final data release (eBOSS DR16), covering the redshift range from 0.6 to 2.2, to provide reliable estimates of covariance matrices and test the robustness of the analysis pipeline with respect to observational systematics. By extending the Zel'dovich approximation density field with an effective tracer bias model calibrated with the cluster…
SPIDERS is the spectroscopic follow-up effort of the Sloan Digital Sky Survey IV (SDSS-IV) project for the identification of X-ray selected galaxy clusters. We present our catalogue of 2740 visually inspected galaxy clusters as a part of the SDSS Data Release 16 (DR16). Here we detail the target selection, our methods for validation of the candidate clusters, performance of the survey, the construction of the final sample, and a full description of what is found in the catalogue. Of the sample, the median number of members per cluster is approximately 10, with 818 having 15 or greater. We find…
We look to provide a detailed description of the SPectroscopic IDentification of ERosita Sources (SPIDERS) survey, an SDSS-IV programme aimed at obtaining spectroscopic classification and redshift measurements for complete samples of sufficiently bright X-ray sources. We describe the SPIDERS X-ray Point Source Spectroscopic Catalogue, considering its store of 11,092 observed spectra drawn from a parent sample of 14,759 ROSAT and XMM sources over an area of 5,129 deg$^2$ covered in SDSS-IV by the eBOSS survey. This programme represents the largest systematic spectroscopic observation of an X-ra…
We spectroscopically detected candidate emission-lines of 8 likely, 17 probable, and 69 possible strong galaxy-galaxy gravitational lens candidates found within the spectra of ~10,000 galaxy targets contained within the completed Mapping of Nearby Galaxies at Apache Point Observatory (MaNGA) survey. This search is based upon the methodology of the Spectroscopic Identification of Lensing Objects (SILO) project, which extends the spectroscopic detection methods of the BOSS Emission-Line Lensing Survey (BELLS) and the Sloan Lens ACS Survey (SLACS). We scanned the co-added residuals that we constr…
Photometric redshift requirements for lens galaxies in galaxy-galaxy lensing analyses
弱引力透镜是研究星系形成和宇宙学的重要工具。在这里,我们量化的影响,使用光度红移(photo-z)在星系星系透镜,无论是源和镜头,无论是直接的目标,使用星系与photo-z作为镜头在斯隆数字巡天(SDSS),并作为一个示范的方法,为大型,即将到来的弱透镜调查,将由必然的主导镜头样本与photo-z。我们计算了透镜质量校准中的偏差以及绝对幅度的结果(即,k-校正)和恒星质量的估计,SDSS数据发布8(DR 8)星系的大样本。在SDSS DR 8 ugriz光度计上用基于模板的光z代码ZEBRA获得红移。我们组装和校准样品(~ 9 k光谱红移从四个调查),以获得光度红移误差和透镜偏差对应于我们的完整的SDSS DR 8镜头和源目录。我们对校准样品的测试还突出了当光谱校准覆盖其足迹的一小部分时成像调查中观察条件的影响;校准场中的非典型成像条件可能导致关于完整调查的照片z的错误结论。对于SDSS DR 8星表,透镜星表和源星表的σ_z/(1+z)分别为0.096和0.113,通量极限分别为r=21和r=21.8。我们还探讨了系统的不确定性时,使用源photo-z的透镜信号校准,镜头和源photo-z;鉴于现有的训练样本的大小,我们可以限制透镜信号校准(因此归一化的表面质量密度)分别在2%和4%。[删节]
We report measurements of the angular scale of cosmic homogeneity ($θ_{H}$) using the recently released luminous red galaxy sample of the sixteenth data release of the Sloan Digital Sky Survey (SDSS-IV LRG DR16). It consists of a model-independent method, as we only use the celestial coordinates of these objects to carry out such an analysis. The observational data is divided into thin redshift bins, namely $0.67<z<0.68$, $0.70<z<0.71$, and $0.73<z<0.74$, in order to avoid projection biases, and we estimate our uncertainties through a bootstrap method and a suite of mock catalogues. We find th…
Mimicking the large-scale structure of the Local Universe. Synthetic pre-labelled galaxies in large-scale structures
Universidad de Granada(格拉纳达大学);Instituto Carlos I de Física Teórica y Computacional(卡洛斯一世理论物理与计算物理研究所);Instituto de Astrofísica de Andalucía, CSIC(安达卢西亚天体物理研究所,西班牙高等科学研究委员会);ATG Analytical(ATG分析公司)
Small- and Large-Scale Galactic Conformity in SDSS DR7
星系整合是指星系性质在距离上表现出比预期的更多的相关性,如果这些性质只依赖于晕质量。我们进行了全面的研究一致性在低红移使用星系群目录从SDSS DR 7光谱样本。我们研究了中央星系和它们的卫星星系(1-晕)之间的相关性,以及中央星系在单独的晕(2-晕)之间的相关性。我们使用淬火分数和显着的关联函数(MCF),探测符合三个星系的属性,$(g-r)$颜色,特定的恒星形成率(sSFR),和形态。我们评估了一套模拟星系目录,没有内置的一致性,但包含相同的组发现和质量分配错误的真实数据的一致性信号的统计意义。在1-晕一致性的情况下,淬火馏分在所有组质量显示出强信号。然而,这些信号在模拟星表中同样强烈,表明一致性信号是虚假的,可能完全是由群体发现系统学引起的,这对以前的1-halo一致性检测提出了质疑。MCF揭示了大量群体内的径向分离的显著检测,但没有一致性的证据。在2-卤素一致性的情况下,淬火馏分显示没有显着的证据一致性的颜色或sSFR一旦与模拟目录相比,但使用形态学的明确信号。相比之下,MCF揭示了低质量组和$0.8-4\ h^{-1}\textrm{Mpc}$标度中所有三种性质的小但高度显著的信号,可能代表2-晕一致性的首次稳健检测。
We present the first all-sky catalogue of galaxy clusters and cluster candidates obtained from joint X-ray-SZ detections using observations from the Planck satellite and the ROSAT all-sky survey (RASS). The catalogue contains 2323 objects and has been validated by careful cross-identification with previously known clusters. This validation shows that 1597 candidates correspond to already known clusters, 212 coincide with other cluster candidates still to be confirmed, and the remaining 514 are completely new detections. With respect to Planck catalogues, the ComPRASS catalogue is simultaneousl…