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161.
The 2dF Galaxy Redshift Survey: the bias of galaxies and the density of the Universe 总被引:1,自引:0,他引:1
Licia Verde Alan F. Heavens Will J. Percival Sabino Matarrese Carlton M. Baugh Joss Bland-Hawthorn Terry Bridges Russell Cannon Shaun Cole Matthew Colless Chris Collins Warrick Couch Gavin Dalton Roberto De Propris Simon P. Driver George Efstathiou Richard S. Ellis Carlos S. Frenk Karl Glazebrook Carole Jackson Ofer Lahav Ian Lewis Stuart Lumsden Steve Maddox Darren Madgwick Peder Norberg John A. Peacock Bruce A. Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2002,335(2):432-440
162.
The 2dF-SDSS LRG and QSO Survey: the LRG 2-point correlation function and redshift-space distortions
Nicholas P. Ross J. da Ângela T. Shanks David A. Wake Russell D. Cannon A. C. Edge R. C. Nichol P. J. Outram Matthew Colless Warrick J. Couch Scott M. Croom Roberto De Propris Michael J. Drinkwater Daniel J. Eisenstein Jon Loveday Kevin A. Pimbblet Isaac G. Roseboom Donald P. Schneider Robert G. Sharp P. M. Weilbacher 《Monthly notices of the Royal Astronomical Society》2007,381(2):573-588
163.
Quentin A. Parker S. Phillipps M. J. Pierce M. Hartley N. C. Hambly M. A. Read H. T. MacGillivray S. B. Tritton C. P. Cass R. D. Cannon M. Cohen J. E. Drew D. J. Frew E. Hopewell S. Mader D. F. Malin M. R. W. Masheder D. H. Morgan R. A. H. Morris D. Russeil K. S. Russell R. N. F. Walker 《Monthly notices of the Royal Astronomical Society》2005,362(2):689-710
164.
Roberto De Propris Warrick J. Couch Matthew Colless Gavin B. Dalton Chris Collins Carlton M. Baugh Joss Bland-Hawthorn Terry Bridges Russell Cannon Shaun Cole Nicholas Cross Kathryn Deeley Simon P. Driver George Efstathiou Richard S. Ellis Carlos S. Frenk Karl Glazebrook Carole Jackson Ofer Lahav Ian Lewis Stuart Lumsden Steve Maddox Darren Madgwick Stephen Moody Peder Norberg John A. Peacock Will Percival Bruce A. Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2002,329(1):87-101
We have carried out a study of known clusters within the 2dF Galaxy Redshift Survey (2dFGRS) observed areas and have identified 431 Abell, 173 APM and 343 EDCC clusters. Precise redshifts, velocity dispersions and new centroids have been measured for the majority of these objects, and this information is used to study the completeness of these catalogues, the level of contamination from foreground and background structures along the cluster's line of sight, the space density of the clusters as a function of redshift, and their velocity dispersion distributions. We find that the Abell and EDCC catalogues are contaminated at the level of about 10 per cent, whereas the APM catalogue suffers only 5 per cent contamination. If we use the original catalogue centroids, the level of contamination rises to approximately 15 per cent for the Abell and EDCC catalogues, showing that the presence of foreground and background groups may alter the richness of clusters in these catalogues. There is a deficiency of clusters at that may correspond to a large underdensity in the Southern hemisphere. From the cumulative distribution of velocity dispersions for these clusters, we derive a space density of clusters of This result is used to constrain models for structure formation; our data favour low-density cosmologies, subject to the usual assumptions concerning the shape and normalization of the power spectrum. 相似文献
165.
Darren J. Croton Glennys R. Farrar Peder Norberg Matthew Colless John A. Peacock I. K. Baldry C. M. Baugh J. Bland-Hawthorn T. Bridges R. Cannon S. Cole C. Collins W. Couch G. Dalton R. De Propris S. P. Driver G. Efstathiou R. S. Ellis C. S. Frenk K. Glazebrook C. Jackson O. Lahav I. Lewis S. Lumsden S. Maddox D. Madgwick B. A. Peterson W. Sutherland K. Taylor 《Monthly notices of the Royal Astronomical Society》2005,356(3):1155-1167
We use the 2dF Galaxy Redshift Survey to measure the dependence of the b J -band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8 h −1 Mpc , and on spectral type, determined from principal component analysis. We find that the galaxy populations at both extremes of density differ significantly from that at the mean density. The population in voids is dominated by late types and shows, relative to the mean, a deficit of galaxies that becomes increasingly pronounced at magnitudes brighter than M b J −5log10 h ≲−18.5 . In contrast, cluster regions have a relative excess of very bright early-type galaxies with M b J −5log10 h ≲−21 . Differences in the mid- to faint-end population between environments are significant: at M b J −5log10 h =−18 early- and late-type cluster galaxies show comparable abundances, whereas in voids the late types dominate by almost an order of magnitude. We find that the luminosity functions measured in all density environments, from voids to clusters, can be approximated by Schechter functions with parameters that vary smoothly with local density, but in a fashion that differs strikingly for early- and late-type galaxies. These observed variations, combined with our finding that the faint-end slope of the overall luminosity function depends at most weakly on density environment, may prove to be a significant challenge for models of galaxy formation. 相似文献
166.
The 2dF Galaxy Redshift Survey: correlation functions, peculiar velocities and the matter density of the Universe 总被引:1,自引:0,他引:1
Ed Hawkins Steve Maddox Shaun Cole Ofer Lahav Darren S. Madgwick Peder Norberg John A. Peacock Ivan K. Baldry Carlton M. Baugh Joss Bland-Hawthorn Terry Bridges Russell Cannon Matthew Colless Chris Collins Warrick Couch Gavin Dalton Roberto De Propris Simon P. Driver George Efstathiou Richard S. Ellis Carlos S. Frenk Karl Glazebrook Carole Jackson Bryn Jones Ian Lewis Stuart Lumsden Will Percival Bruce A. Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2003,346(1):78-96
167.
Vivienne Wild John A. Peacock Ofer Lahav Edward Conway Steve Maddox Ivan K. Baldry Carlton M. Baugh Joss Bland-Hawthorn Terry Bridges Russell Cannon Shaun Cole Matthew Colless Chris Collins Warrick Couch Gavin Dalton Roberto De Propris Simon P. Driver George Efstathiou Richard S. Ellis Carlos S. Frenk Karl Glazebrook Carole Jackson Ian Lewis Stuart Lumsden Darren Madgwick Peder Norberg Bruce A. Peterson Will Sutherland Keith Taylor 《Monthly notices of the Royal Astronomical Society》2005,356(1):247-269
168.
David A. Wake Robert C. Nichol Daniel J. Eisenstein Jon Loveday Alastair C. Edge Russell Cannon Ian Smail Donald P. Schneider Ryan Scranton Daniel Carson Nicholas P. Ross Robert J. Brunner Matthew Colless Warrwick J. Couch Scott M. Croom Simon P. Driver José da Ângela Sebastian Jester Roberto de Propris Michael J. Drinkwater Joss Bland-Hawthorn Kevin A. Pimbblet Isaac G. Roseboom Tom Shanks Robert G. Sharp Jon Brinkmann 《Monthly notices of the Royal Astronomical Society》2006,372(2):537-550
169.
I.H. Stairs R.N. Manchester A.G. Lyne V.M. Kaspi † F. Camilo J.F. Bell N. D'Amico M. Kramer F. Crawford ‡ D.J. Morris A. Possenti N.P.F. McKay S.L. Lumsden L.E. Tacconi-Garman R.D. Cannon N.C. Hambly P.R. Wood 《Monthly notices of the Royal Astronomical Society》2001,325(3):979-988
We report on the discovery of a binary pulsar, PSR J1740−3052, during the Parkes multibeam survey. Timing observations of the 570-ms pulsar at Jodrell Bank and Parkes show that it is young, with a characteristic age of 350 kyr, and is in a 231-d, highly eccentric orbit with a companion whose mass exceeds 11 M⊙ . An accurate position for the pulsar was obtained using the Australia Telescope Compact Array. Near-infrared 2.2-μm observations made with the telescopes at the Siding Spring observatory reveal a late-type star coincident with the pulsar position. However, we do not believe that this star is the companion of the pulsar, because a typical star of this spectral type and required mass would extend beyond the orbit of the pulsar. Furthermore, the measured advance of periastron of the pulsar suggests a more compact companion, for example, a main-sequence star with radius only a few times that of the Sun. Such a companion is also more consistent with the small dispersion measure variations seen near periastron. Although we cannot conclusively rule out a black hole companion, we believe that the companion is probably an early B star, making the system similar to the binary PSR J0045−7319. 相似文献
170.
A one-dimensional analysis of the 4571 Å line of neutral magnesium is presented. The Harvard-Smithsonian Reference Atmosphere (HSRA) and the Bilderberg Continuum Atmosphere (BCA) are used to compute the emergent line profiles at various positions on the solar disc. The resultant profiles, when compared to the observations, indicate that the HSRA electron temperature distribution is a more satisfactory representation of the solar atmosphere in the region of the temperature minimum than is the BCA. A slight modification to the HSRA is suggested which reduces the minimum temperature to 4140K and enables an even more satisfactory fit to the available data.On leave from Sacramento Peak Observatory, Air Force Cambridge Research Laboratories. 相似文献