Results 31 to 40 of about 1,118,538 (204)

The SSA22 H i Tomography Survey (SSA22-HIT). I. Data Set and Compiled Redshift Catalog

The Astronomical Journal, 2023
We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope, designed to tomographically map high- z H i gas through analysis of Ly α absorption in background
Ken Mawatari, Akio K. Inoue, Toru Yamada, Tomoki Hayashino, J. Xavier Prochaska, Khee-Gan Lee, Nicolas Tejos, Nobunari Kashikawa, Takuya Otsuka, Satoshi Yamanaka, David J. Schlegel, Yuichi Matsuda, Joseph F. Hennawi, Ikuru Iwata, Hideki Umehata, Shiro Mukae, Masami Ouchi, Yuma Sugahara, Yoichi Tamura   +18 more
doaj   +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 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

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

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

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

Optical Redshift Surveys [PDF]

Highlights of Astronomy, 1992
Redshift surveys of galaxies have been over the past decade the major source of information for studies of the large-scale structure of the Universe. Following the completion of the original CfA Redshift Survey, several groups have joined the endeavor, probing different regions of the sky to different depths in a remarkable long-term effort to study ...
openaire   +1 more source

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

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

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