Results 21 to 30 of about 8,837 (309)

The 2Mass Redshift Survey [PDF]

Highlights of Astronomy, 1998
With the current convergence of determinations of the Hubble Constant (e.g. The Extragalactic Distance Scale, 1997, Livio, Donahue and Panagia, eds.) to values within ±25% rather than a factor of two, and the clear possibility of determining q0 using high redshift supernovae (Garnavich et al.
J. Huchra, E. Tollestrup, S. Schneider, M. Skrutski, T. Jarrett, T. Chester, R. Cutri   +6 more
openaire   +1 more source

The AAO 2DF QSO Redshift Survey [PDF]

Symposium - International Astronomical Union, 1999
The study of large-scale structure through QSO clustering provides a potentially powerful route to determining the fundamental cosmological parameters of the Universe (see Croom & Shanks 1996). Unfortunately, previous QSO clustering studies have been limited by the relatively small sizes of homogeneous QSO catalogues that have been available ...
Boyle, Smith, R, Shanks, T, Croom, S, Miller, L   +4 more
openaire   +3 more sources

GALAXY GROUPS IN THE 2MASS REDSHIFT SURVEY [PDF]

The Astrophysical Journal, 2016
ABSTRACT A galaxy group catalog is constructed from the 2MASS Redshift Survey (2MRS) with the use of a halo-based group finder. The halo mass associated with a group is estimated using a “GAP” method based on the luminosity of the central galaxy and its gap with other member galaxies.
Yi Lu, Xiaohu Yang, Feng Shi, H. J. Mo, Dylan Tweed, Huiyuan Wang, Youcai Zhang, Shijie Li, S. H. Lim   +8 more
openaire   +2 more sources

High-redshift QSOs in the FIRST survey [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
7 pages, including 5 ...
Benn C.R., Vigotti M., Pedani M., Holt J., Mack K.H., Curran R., Sanchez S.F.   +6 more
openaire   +3 more sources

PHOTOMETRIC REDSHIFTS FOR QUASARS IN MULTI-BAND SURVEYS [PDF]

The Astrophysical Journal, 2013
MLPQNA stands for Multi Layer Perceptron with Quasi Newton Algorithm and it is a machine learning method which can be used to cope with regression and classification problems on complex and massive data sets. In this paper we give the formal description of the method and present the results of its application to the evaluation of photometric redshifts ...
Brescia M., Cavuoti S., D’Abrusco R., Mercurio A., Longo G.   +4 more
openaire   +8 more sources

The CNOC2 field galaxy redshift survey [PDF]

Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 1999
The CNOC2 field galaxy redshift survey is designed to provide measurements of the evolution of galaxies and their clustering over the redshift range 0 to 0.7. The sample is spread over four sky patches with a total area of about 1.5 square degrees. Here we report preliminary results based on two of the sky patches, and the redshift range of 0.15 to 0 ...
Carlberg, R. G., Yee, H. K. C., Morris, S. L, Lin, H., Sawicki, M., Wirth, G., Patton, D., Shepherd, C. W., Ellingson, E., Schade, D., Pritchet, C. J., Hartwick, F. D. A.   +11 more
openaire   +2 more sources

Modelling baryonic feedback for survey cosmology

The Open Journal of Astrophysics, 2019
Observational cosmology in the next decade will rely on probes of the distribution of matter in the redshift range between ...
Elisa Chisari, Alexander J. Mead, Shahab Joudaki, Pedro G. Ferreira, Aurel Schneider, Joseph Mohr, Tilman, David Alonso, Ian G. McCarthy, Sergio Martin-Alvarez, Julien Devriendt, Adrianne Slyz, Marcel P. van Daalen   +12 more
doaj   +1 more source

The Unexplored Redshift Survey [PDF]

Publications of the Astronomical Society of the Pacific, 2001
Redshift surveys remain an important constraint on cosmological parameters and a key to characterizing the nature and evolution of the large‐scale distribution of galaxies. I discuss redshift surveys as a route to exploration of other issues associated with large‐scale structure including the low surface brightness universe and the links between star ...
openaire   +1 more source

Topology and geometry of the CfA2 redshift survey [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
We analyse the redshift space topology and geometry of the nearby Universe by computing the Minkowski functionals of the Updated Zwicky Catalogue (UZC). The UZC contains the redshifts of almost 20,000 galaxies, is 96% complete to the limiting magnitude m_Zw=15.5 and includes the Center for Astrophysics (CfA) Redshift Survey (CfA2).
Schmalzing, Jens, Diaferio, Antonaldo
openaire   +2 more sources

Correcting for Interloper Contamination in the Power Spectrum with Neural Networks

The Astrophysical Journal
Modern slitless spectroscopic surveys such as Euclid and Roman collect vast numbers of galaxy spectra, but their low signal-to-noise ratios often lead to incorrect redshift assignments when relying on a single emission line.
Marina S. Cagliari, Azadeh Moradinezhad Dizgah, Francisco Villaescusa-Navarro   +2 more
doaj   +1 more source