Results 21 to 30 of about 1,149,467 (210)

A new statistic for redshift surveys: the redshift dispersion of galaxies [PDF]

New Astronomy, 1997
LaTex 27 pages, 8 Postscript figures, added one figure and some changes to the ...
Kepner, Jeremy, Summers, Frank, Strauss, Michael   +2 more
openaire   +2 more sources

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

A comparison of photometric redshift techniques for large radio surveys [PDF]

, 2019
Future radio surveys will generate catalogs of tens of millions of radio sources, for which redshift estimates will be essential to achieve many of the science goals.
Vaccari M., Seymour N., Smolcic V., Salvato M., Brescia M., Polsterer K., Geach J., Riccio G., Zinn P., Luken K., Cavuoti S., Longo G., Farrah D., Musaeva A., Carliles S., Budavari T., Norris R. P.   +16 more
core   +3 more sources

Forecasting cosmological constraints from redshift surveys [PDF]

, 2009
Observations of redshift-space distortions in spectroscopic galaxy surveys offer an attractive method for observing the build-up of cosmological structure, which depends both on the expansion rate of the Universe and our theory of gravity. In this paper,
Yong-seon Song, Will J. Percival, Song, Yong-seon, Percival, Will, White, M., Martin White   +5 more
core   +1 more source

Measuring redshift-space distortions using photometric surveys [PDF]

, 2011
12 páginas, 14 figuras.-- El Pdf del artículo es la versión pre-print: arXiv:1102.0968v3We outline how redshift-space distortions (RSD) can be measured from the angular correlation function, w(θ), of galaxies selected from photometric surveys.
Ashley J. Ross, Martín Crocce, Cabré, Anna, Gaztañaga, Enrique, Percival, Will, Crocce, M., Ross, Ashley, Cabre, A., Gaztanaga, E., Ross, Ashley J., Will J. Percival, Percival, Will J., Enrique Gaztañaga, Anna Cabré, Crocce, Martín   +14 more
core   +1 more source

Galaxy and mass assembly (GAMA) : AUTOZ spectral redshift measurements, confidence and errors [PDF]

, 2014
The Galaxy And Mass Assembly (GAMA) survey has obtained spectra of over 230 000 targets using the Anglo-Australian Telescope. To homogenize the redshift measurements and improve the reliability, a fully automatic redshift code was developed (AUTOZ).
Gunawardhana, M. L. P., Driver, S. P., M E Cluver (16161572), M Alpaslan (16114469), A M Hopkins (16143587), B W Holwerda (16219943), Jonathan Loveday (4460899), Driver, S.P., Á R López-Sánchez (16219868), Holwerda, Benne W., López-Sánchez, A.R., Baldry, I. K., Alpaslan, M., J Bland-Hawthorn (16111139), Bauer, A. E., Davies, L. J. M., E N Taylor (16143620), Baldry, I.K., A S G Robotham (16143614), A E Bauer (16161566), Hopkins, A. M., Brough, S., Loveday, J., I K Baldry (16072595), M L P Gunawardhana (16161569), Croom, S. M., Liske, J., P Norberg (16143575), Holwerda, B.W., L S Kelvin (16143602), S M Croom (16143596), Taylor, E.N., Robotham, A. S. G., Bauer, A.E., Bland-Hawthorn, J., Robotham, A.S.G., J Peacock (9865184), Gunawardhana, M.L.P., Peacock, J. A., Hopkins, A.M., Taylor, E. N., Lopez-Sanchez, A. R., S Brough (16143590), L J M Davies (16219937), Kelvin, L.S., Norberg, P., J Liske (7814738), Croom, S.M., Kelvin, L. S., Davies, L.J.M., Peacock, J., Cluver, M.E., Cluver, M. E., S P Driver (16143581)   +53 more
core   +1 more source

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

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

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

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