scholarly journals A spectroscopic census of the Fornax cluster and beyond: preparing for next generation surveys

2019 ◽  
Vol 490 (2) ◽  
pp. 1666-1677 ◽  
Author(s):  
Natasha Maddox ◽  
Paolo Serra ◽  
Aku Venhola ◽  
Reynier Peletier ◽  
Ilani Loubser ◽  
...  
Keyword(s):  
Dynamic System ◽  
Southern Hemisphere ◽  
Large Scale ◽  
Near Infrared ◽  
State Of The Art ◽  
Large Scale Structure ◽  
Large Cluster ◽  
Cluster Membership ◽  
The Many ◽  
Fornax Cluster

ABSTRACT The Fornax cluster is the nearest large cluster in the southern sky, and is currently experiencing active assembly of mass. It is thus the target of a number of ongoing observing campaigns at optical, near-infrared, and radio wavelengths, using state-of-the-art facilities in the Southern hemisphere. Spectroscopic redshifts are essential not only for determining cluster membership, but also kinematics within the cluster and identifying substructures. We present a compilation of all available major spectroscopic campaigns undertaken within the Fornax region, including new and previously unpublished spectroscopy. This provides not only a comprehensive census of Fornax cluster membership as a resource for the many ongoing studies of this dynamic system, but also probes the large-scale structure in the background volume.

scholarly journals Clusters of Galaxies

1980 ◽  
Vol 5 ◽  
pp. 699-714 ◽  
Author(s):  
Neta A. Bahcall
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Clusters Of Galaxies ◽  
Groups Of Galaxies ◽  
Formation And Evolution ◽  
The Rich ◽  
The Many ◽  
The Universe

AbstractClusters and groups of galaxies contain the majority of galaxies in the universe. The rich clusters, while less numerous than the many poor groups, are the densest and largest systems known, and can be easily recognized and studied even at relatively large distances. Their study is important for understanding the formation and evolution of clusters and galaxies, and for a determination of the large-scale structure in the universe.

scholarly journals AN EXTREMELY DEEP, WIDE-FIELD NEAR-INFRARED SURVEY: BRIGHT GALAXY COUNTS AND LOCAL LARGE SCALE STRUCTURE

2009 ◽  
Vol 186 (1) ◽  
pp. 94-110 ◽  
Author(s):  
R. C. Keenan ◽  
L. Trouille ◽  
A. J. Barger ◽  
L. L. Cowie ◽  
W.-H. Wang
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Wide Field ◽  
Bright Galaxy ◽  
Infrared Survey

scholarly journals Bayesian large-scale structure inference: initial conditions and the cosmic web

2014 ◽  
Vol 10 (S306) ◽  
pp. 1-4
Author(s):  
Florent Leclercq ◽  
Benjamin Wandelt
Keyword(s):  
Large Scale ◽  
Initial Conditions ◽  
Large Scale Structure ◽  
Monte Carlo Sampling ◽  
Scale Structure ◽  
Sloan Digital Sky Survey ◽  
Inhomogeneous Universe ◽  
Sky Survey ◽  
Formation History ◽  
The Many

AbstractWe describe an innovative statistical approach for theab initiosimultaneous analysis of the formation history and morphology of the large-scale structure of the inhomogeneous Universe. Our algorithm explores the joint posterior distribution of the many millions of parameters involved via efficient Hamiltonian Markov Chain Monte Carlo sampling. We describe its application to the Sloan Digital Sky Survey data release 7 and an additional non-linear filtering step. We illustrate the use of our findings for cosmic web analysis: identification of structures via tidal shear analysis and inference of dark matter voids.

scholarly journals Galaxies Detected by the Dwingeloo Obscured Galaxies Survey

1999 ◽  
Vol 16 (1) ◽  
pp. 48-52 ◽  
Author(s):  
A. J. Rivers ◽  
P. A. Henning ◽  
R. C. Kraan-Korteweg
Keyword(s):  
Southern Hemisphere ◽  
Large Scale ◽  
Milky Way ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Ngc 6946 ◽  
Northern Zone ◽  
Nearby Galaxies ◽  
Zone Of Avoidance

AbstractThe Dwingeloo Obscured Galaxies Survey (DOGS) is a 21-cm blind survey for galaxies hidden in the northern ‘Zone of Avoidance’ (ZOA): the portion of the optical extragalactic sky which is obscured by dust in the Milky Way. Like the Parkes southern hemisphere ZOA survey, the DOGS project is designed to reveal hidden dynamically important nearby galaxies and to help ‘fill in the blanks’ in the local large scale structure. To date, 36 galaxies have been detected by the Dwingeloo survey; 23 of these were previously unknown [no corresponding sources recorded in the NASA Extragalactic Database (NED)]. Among the interesting detections are three nearby galaxies in the vicinity of NGC 6946 and 11 detections in the Supergalactic plane crossing region. VLA follow-up observations have been conducted for several of the DOGS detections.

scholarly journals Trend filtering – II. Denoising astronomical signals with varying degrees of smoothness

2020 ◽  
Vol 492 (3) ◽  
pp. 4019-4032 ◽  
Author(s):  
Collin A Politsch ◽  
Jessi Cisewski-Kehe ◽  
Rupert A C Croft ◽  
Larry Wasserman
Keyword(s):  
Light Curve ◽  
Time Domain ◽  
Data Reduction ◽  
Large Scale ◽  
State Of The Art ◽  
Large Scale Structure ◽  
Light Curves ◽  
Statistical Tool ◽  
Observational Astronomy ◽  
Quasar Spectra

ABSTRACT Trend filtering – first introduced into the astronomical literature in Paper I of this series – is a state-of-the-art statistical tool for denoising 1D signals that possess varying degrees of smoothness. In this work, we demonstrate the broad utility of trend filtering to observational astronomy by discussing how it can contribute to a variety of spectroscopic and time-domain studies. The observations we discuss are (1) the Lyman-α (Lyα) forest of quasar spectra; (2) more general spectroscopy of quasars, galaxies, and stars; (3) stellar light curves with planetary transits; (4) eclipsing binary light curves; and (5) supernova light curves. We study the Lyα forest in the greatest detail – using trend filtering to map the large-scale structure of the intergalactic medium along quasar-observer lines of sight. The remaining studies share broad themes of: (1) estimating observable parameters of light curves and spectra; and (2) constructing observational spectral/light-curve templates. We also briefly discuss the utility of trend filtering as a tool for 1D data reduction and compression.

scholarly journals Non-Gaussianity from Large-Scale Structure Surveys

2010 ◽  
Vol 2010 ◽  
pp. 1-15 ◽  
Author(s):  
Licia Verde
Keyword(s):  
Density Distribution ◽  
Large Scale ◽  
Large Fraction ◽  
Three Dimensional ◽  
Large Scale Structure ◽  
Higher Order ◽  
Large Cluster ◽  
Galaxy Surveys ◽  
Large Samples ◽  
Galaxy Distribution

With the advent of galaxy surveys which provide large samples of galaxies or galaxy clusters over a volume comparable to the horizon size (SDSS-III, HETDEX, Euclid, JDEM, LSST, Pan-STARRS, CIP, etc.) or mass-selected large cluster samples over a large fraction of the extra-galactic sky (Planck, SPT, ACT, CMBPol, B-Pol), it is timely to investigate what constraints these surveys can impose on primordial non-Gaussianity. I illustrate here three different approaches: higher-order correlations of the three dimensional galaxy distribution, abundance of rare objects (extrema of the density distribution), and the large-scale clustering of halos (peaks of the density distribution). Each of these avenues has its own advantages, but, more importantly, these approaches are highly complementary under many respects.

Zeitstrukturen im Jazz

2014 ◽  
Vol 59 (1) ◽  
pp. 79-92
Author(s):  
Alexander Becker
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Time Frame ◽  
Scale Structure ◽  
Classical Form ◽  
Jazz Music ◽  
The Moment

Wie erlebt der Hörer Jazz? Bei dieser Frage geht es unter anderem um die Art und Weise, wie Jazz die Zeit des Hörens gestaltet. Ein an klassischer Musik geschultes Ohr erwartet von musikalischer Zeitgestaltung, den zeitlichen Rahmen, der durch Anfang und Ende gesetzt ist, von innen heraus zu strukturieren und neu zu konstituieren. Doch das ist keine Erwartung, die dem Jazz gerecht wird. Im Jazz wird der Moment nicht im Hinblick auf ein Ziel gestaltet, das von einer übergeordneten Struktur bereitgestellt wird, sondern so, dass er den Bewegungsimpuls zum nächsten Moment weiterträgt. Wie wirkt sich dieses Prinzip der Zeitgestaltung auf die musikalische Form im Großen aus? Der Aufsatz untersucht diese Frage anhand von Beispielen, an denen sich der Weg der Transformation von einer klassischen zu einer dem Jazz angemessenen Form gut nachverfolgen lässt.<br><br>How do listeners experience Jazz? This is a question also about how Jazz music organizes the listening time. A classically educated listener expects a piece of music to structure, unify and thereby re-constitute the externally given time frame. Such an expectation is foreign to Jazz music which doesn’t relate the moment to a goal provided by a large scale structure. Rather, one moment is carried on to the next, preserving the stimulus potentially ad infinitum. How does such an organization of time affect the large scale form? The paper tries to answer this question by analyzing two examples which permit to trace the transformation of a classical form into a form germane to Jazz music.

Integration of Ecological and Engineering Aspects in Planning Large Scale Tidal Power Development in the Bay of Fundy, Canada

1984 ◽  
Vol 16 (1-2) ◽  
pp. 281-295 ◽  
Author(s):  
Donald C Gordon
Keyword(s):  
Large Scale ◽  
Feasibility Studies ◽  
Bay Of Fundy ◽  
Final Decision ◽  
Power Development ◽  
Tidal Power ◽  
History Of ◽  
Scientists And Engineers ◽  
The Many ◽  
University Scientists

Large-scale tidal power development in the Bay of Fundy has been given serious consideration for over 60 years. There has been a long history of productive interaction between environmental scientists and engineers durinn the many feasibility studies undertaken. Up until recently, tidal power proposals were dropped on economic grounds. However, large-scale development in the upper reaches of the Bay of Fundy now appears to be economically viable and a pre-commitment design program is highly likely in the near future. A large number of basic scientific research studies have been and are being conducted by government and university scientists. Likely environmental impacts have been examined by scientists and engineers together in a preliminary fashion on several occasions. A full environmental assessment will be conducted before a final decision is made and the results will definately influence the outcome.

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