scholarly journals A kinematic confirmation of the hidden Vela supercluster

2019 ◽  
Vol 490 (1) ◽  
pp. L57-L61 ◽  
Author(s):  
Hélène M Courtois ◽  
Renée C Kraan-Korteweg ◽  
Alexandra Dupuy ◽  
Romain Graziani ◽  
Noam I Libeskind
Keyword(s):  
Excellent Agreement ◽  
Mass Concentration ◽  
Large Scale ◽  
Milky Way ◽  
Large Scale Structure ◽  
Peculiar Velocity ◽  
The Galaxy ◽  
Zone Of Avoidance ◽  
First Time ◽  
The Universe

ABSTRACT The Universe region obscured by the Milky Way is very large and only future blind large H i redshift, and targeted peculiar surveys on the outer borders will determine how much mass is hidden there. Meanwhile, we apply for the first time two independent techniques to the galaxy peculiar velocity catalogue CosmicFlows−3 in order to explore for the kinematic signature of a specific large-scale structure hidden behind this zone: the Vela supercluster at cz ∼18 000 km s−1. Using the gravitational velocity and density contrast fields, we find excellent agreement when comparing our results to the Vela object as traced in redshift space. The article provides the first kinematic evidence of a major mass concentration (knot of the Cosmic Web) located in the direction behind Vela constellation, pin pointing that the Zone of Avoidance should be surveyed in detail in the future.

scholarly journals Faint Structures in Low Density Regions of the Nearby Universe

1999 ◽  
Vol 183 ◽  
pp. 256-256
Author(s):  
U. Lindner ◽  
K.J. Fricke ◽  
J. Einasto ◽  
M. Einasto
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Morphological Type ◽  
High Density ◽  
Low Density ◽  
Clusters Of Galaxies ◽  
Galaxy Distribution ◽  
The Galaxy ◽  
Empty Sphere ◽  
First Time

We present an investigation of the galaxy distribution in the huge underdense region between the Hercules, Coma and Local Superclusters, the so-called Northern Local Void (NLV), using void statistics (for details refer to Lindner et al. this Volume). Reshift data for galaxies and poor clusters of galaxies are available in low and high density regions as well. Samples of galaxies with different morphological type and various luminosity limits have been studied separately and void catalogues have been compiled from three different luminosity limited galaxy samples for the first time. Voids have been found using the empty sphere method which has the potential to detect and describe subtle structures in the galaxy distribution. Our approach is complementary to most other methods usually used in Large–Scale Structure studies.

scholarly journals Distribution of CO in the Southern Milky Way and large-scale structure in the Galaxy

1985 ◽  
Vol 106 ◽  
pp. 203-204
Author(s):  
W.H. Mccutcheon ◽  
B. J. Robinson ◽  
R. N. Manchester ◽  
J. B. Whiteoak
Keyword(s):  
Large Scale ◽  
Milky Way ◽  
Galactic Plane ◽  
Large Scale Structure ◽  
Sampling Interval ◽  
Scale Structure ◽  
Plane Region ◽  
The Galaxy ◽  
Csiro Division

The southern galactic-plane region, in the ranges 294° ≤ 1 ≤ 358°, −0°.075 ≤ b ≤ 0°.075, has been surveyed in the J = 1–0 line of 12CO with a sampling interval of 3′ arc. Observations were made with the 4-metre telescope at the CSIRO Division of Radiophysics in 1980 and 1981. Details of equipment and observing procedure are given in Robinson et al. (1982, 1983); see also McCutcheon et al. (1983).

Distribution of CO in the Southern Milky Way and Large-Scale Structure in the Galaxy

1985 ◽  
pp. 203-204
Author(s):  
W. H. McCutcheon ◽  
B. J. Robinson ◽  
R. N. Manchester ◽  
J. B. Whiteoak
Keyword(s):  
Large Scale ◽  
Milky Way ◽  
Large Scale Structure ◽  
Scale Structure ◽  
The Galaxy

scholarly journals Results from the Dwingeloo Obscured Galaxies Survey

1999 ◽  
Vol 171 ◽  
pp. 334-336
Author(s):  
A.J. Rivers ◽  
P.A. Henning ◽  
R.C. Kraan-Korteweg ◽  
O. Lahav ◽  
W.B. Burton
Keyword(s):  
Large Scale ◽  
Milky Way ◽  
Galactic Plane ◽  
Large Scale Structure ◽  
Milky Way Galaxy ◽  
Dust Extinction ◽  
Infrared Surveys ◽  
Northern Zone ◽  
Nearby Galaxies ◽  
Zone Of Avoidance

AbstractApproximately 25% of the extragalactic sky is obscured by dust in our own Milky Way galaxy. Diligent optical and infrared surveys are successful at detecting galaxies through moderate Galactic dust extinction, but in the most heavily obscured regions near the Galactic plane, only radio surveys are effective.The Dwingeloo Obscured Galaxies Survey (DOGS) is a 21-cm blind survey out to 4000 km s−1 in the northern “Zone of Avoidance” (ZOA). 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.

scholarly journals The study of the Milky Way integrated spectrum and the spiral structure of the Galaxy

1970 ◽  
Vol 38 ◽  
pp. 225-227
Author(s):  
E. B. Kostjakova
Keyword(s):  
Large Scale ◽  
Milky Way ◽  
Spiral Structure ◽  
Large Scale Structure ◽  
Scale Structure ◽  
The Galaxy

The integrated spectrum of the Milky Way can give some information on the composition and large-scale structure of the Galaxy.

The Galaxy Distribution and the Large-Scale Structure of the Universe

1986 ◽  
Vol 470 (1 Twelfth Texas) ◽  
pp. 123-135
Author(s):  
MARGARET J. GELLER ◽  
VALÉRIE LAPPARENT ◽  
MICHAEL J. KURTZ
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Galaxy Distribution ◽  
The Galaxy ◽  
The Universe

scholarly journals The relation between Lyα absorbers and local galaxy filaments

2021 ◽  
Vol 647 ◽  
pp. A166
Author(s):  
S. J. D. Bouma ◽  
P. Richter ◽  
M. Wendt
Keyword(s):  
Large Scale ◽  
High Redshift ◽  
Large Scale Structure ◽  
Scale Structure ◽  
Density Distribution Function ◽  
Exact Relation ◽  
The Galaxy ◽  
Kolmogorov Smirnov ◽  
The Universe ◽  
Smirnov Test

Context. The intergalactic medium (IGM) is believed to contain the majority of baryons in the universe and to trace the same dark matter structure as galaxies, forming filaments and sheets. Lyα absorbers, which sample the neutral component of the IGM, have been extensively studied at low and high redshift, but the exact relation between Lyα absorption, galaxies, and the large-scale structure is observationally not well constrained. Aims. In this study, we aim at characterising the relation between Lyα absorbers and nearby over-dense cosmological structures (galaxy filaments) at recession velocities Δv ≤ 6700 km s−1 by using archival observational data from various instruments. Methods. We analyse 587 intervening Lyα absorbers in the spectra of 302 extragalactic background sources obtained with the Cosmic Origins Spectrograph (COS) installed on the Hubble Space Telescope (HST). We combine the absorption line information with galaxy data of five local galaxy filaments from the V8k catalogue. Results. Along the 91 sightlines that pass close to a filament, we identify 215 (227) Lyα absorption systems (components). Among these, 74 Lyα systems are aligned in position and velocity with the galaxy filaments, indicating that these absorbers and the galaxies trace the same large-scale structure. The filament-aligned Lyα absorbers have a ∼90% higher rate of incidence (d𝒩/dz = 189 for log N(H I) ≥ 13.2) and a slightly shallower column density distribution function slope (−β = −1.47) relative to the general Lyα population at z = 0, reflecting the filaments’ matter over-density. The strongest Lyα absorbers are preferentially found near galaxies or close to the axis of a filament, although there is substantial scatter in this relation. Our sample of absorbers clusters more strongly around filament axes than a randomly distributed sample would do (as confirmed by a Kolmogorov–Smirnov test), but the clustering signal is less pronounced than for the galaxies in the filaments.

scholarly journals DENIS Observations of Multibeam Galaxies in the Zone of Avoidance

1999 ◽  
Vol 16 (1) ◽  
pp. 42-47 ◽  
Author(s):  
A. Schröder ◽  
R. C. Kraan-Korteweg ◽  
G. A. Mamon
Keyword(s):  
Velocity Field ◽  
Large Scale ◽  
Near Infrared ◽  
Milky Way ◽  
Selection Effects ◽  
Galaxy Distribution ◽  
The Galaxy ◽  
Multi Wavelength ◽  
Zone Of Avoidance ◽  
Fisher Relation

AbstractRoughly 25% of the optical extragalactic sky is obscured by the dust and stars of our Milky Way. Dynamically important structures might still lie hidden in this zone. Various surveys are presently being employed to uncover the galaxy distribution in the Zone of Avoidance (ZOA), but all suffer from (different) limitations and selection effects. We illustrate the promise of using a multi-wavelength approach for extragalactic large-scale studies behind the ZOA, i.e. a combination of three surveys, optical, systematic blind HI and near-infrared (NIR), which will allow the mapping of the peculiar velocity field in the ZOA through the NIR Tully–Fisher relation. In particular, we present here the results of cross-identifying HI-detected galaxies with the DENIS NIR survey, and the use of NIR colours to determine foreground extinctions.

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 Simulations of Large-Scale Structure in the New Millennium

2005 ◽  
Vol 216 ◽  
pp. 105-119 ◽  
Author(s):  
Yasushi Suto
Keyword(s):  
Large Scale ◽  
Large Scale Structure ◽  
Vital Role ◽  
Scale Structure ◽  
Observational Cosmology ◽  
Initial Condition ◽  
The Galaxy ◽  
The Universe ◽  
Quasar Distribution ◽  
New Millennium

Simulations of large-scale structure in the universe have played a vital role in observational cosmology since the 1980's in particular. Their important role will definitely continue to be true in the 21st century; indeed the requirements for simulations in the precision cosmology era will become more progressively demanding as they are supposed to fill the missing link in an accurate and reliable manner between the “initial” condition at z=1000 revealed by WMAP and the galaxy/quasar distribution at z=0 − 6 surveyed by 2dF and SDSS. In this review, I will summarize what we have learned so far from the previous cosmological simulations, and discuss several remaining problems for the new millennium.

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