Erratum: Bivariate galaxy luminosity functions in the Sloan Digital Sky Survey     

N. M. Ball  J. Loveday  R. J. Brunner  I. K. Baldry  J. Brinkmann 《Monthly notices of the Royal Astronomical Society》2007,377(4):1808-1808

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Spatial orientations of galaxies in seven Abell clusters of BM type II     

B. Aryal  S. Paudel  W. Saurer 《Monthly notices of the Royal Astronomical Society》2007,379(3):1011-1021

As a concluding paper in this series, we present an analysis of the spatial orientations of galaxies in seven Abell clusters of BM type II and compare the results with previous works. Four BM type II clusters (A1767, A1809, A2554, A2721) show a similar preferred alignment: spin vectors of galaxies tend to lie in the local supercluster plane and the projections of the spin vector tend to be oriented perpendicular with respect to the Virgo cluster centre. A preferred alignment of galaxies in cluster A2554 is noticed in both the two- and three-dimensional analyses. In a comparison with previous work, we noticed a systematic change (with distance, radial velocity, morphology and magnitude) in the galaxy alignments from early-type (BM I) to late-type (BM III) clusters. Possible explanations of these systematic changes will be discussed.  相似文献   

galics– V: Low- and high-order clustering in mock Sloan Digital Sky Surveys     

Jérémy Blaizot  István Szapudi  Stéphane Colombi  Tamás Budavàri  François R. Bouchet  Julien E. G. Devriendt  Bruno Guiderdoni  Jun Pan  Alex Szalay 《Monthly notices of the Royal Astronomical Society》2006,369(3):1009-1020

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Morphology of mock SDSS catalogues     

Jatush V. Sheth 《Monthly notices of the Royal Astronomical Society》2004,354(2):332-342

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The rest-frame optical colours of 99 000 Sloan Digital Sky Survey galaxies     

V. Smol&#;i&#;  &#;. Ivezi&#;  M. Ga&#;e&#;a  K. Rakos  K. Pavlovski  S. Iliji&#;  M. Obri&#;  R. H. Lupton  D. Schlegel  G. Kauffmann  C. Tremonti  J. Brinchmann  S. Charlot  T. M. Heckman  G. R. Knapp  J. E. Gunn  J. Brinkmann  I. Csabai  M. Fukugita  J. Loveday 《Monthly notices of the Royal Astronomical Society》2006,371(1):121-137

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On a systematic bias in surface brightness fluctuations based distances due to gravitational microlensing     

A. V. Tuntsov  G. F. Lewis 《Monthly notices of the Royal Astronomical Society》2006,371(3):1259-1268

The effect of gravitational microlensing on the determination of extragalactic distances using the surface brightness fluctuations (SBF) technique is considered and a method to calculate SBF amplitudes in the presence of microlensing is presented. With a simple approximation for the magnification power spectrum at low optical depth, the correction to the SBF-based luminosity distance is calculated. The results suggest the effect can be safely neglected at present but may become important for SBF-based Hubble diagrams at luminosity distances of about 1 Gpc and beyond.  相似文献   

The ROSAT–ESO Flux-Limited X-ray (REFLEX) galaxy cluster survey – VI. Constraints on the cosmic matter density from the KL power spectrum     

Peter Schuecker  Luigi Guzzo  Chris A. Collins  Hans Böhringer 《Monthly notices of the Royal Astronomical Society》2002,335(3):807-816

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Robust statistics and geochemical data analysis     

Di Zhou 《Mathematical Geology》1987,19(3):207-218

Advantages of robust procedures over ordinary least-squares procedures in geochemical data analysis is demonstrated using NURE data from the Hot Springs Quadrangle, South Dakota, U.S.A. Robust principal components analysis with 5% multivariate trimming successfully guarded the analysis against perturbations by outliers and increased the number of interpretable factors. Regression with SINE estimates significantly increased the goodness-of-fit of the regression and improved the correspondence of delineated anomalies with known uranium prospects. Because of the ubiquitous existence of outliers in geochemical data, robust statistical procedures are suggested as routine procedures to replace ordinary least-squares procedures.  相似文献   

A probabilistic formulation for empirical population synthesis: sampling methods and tests     

Roberto Cid Fernandes †  Laerte SodréJr  Henrique R. Schmitt ‡  João R.S. Leão 《Monthly notices of the Royal Astronomical Society》2001,325(1):60-76

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High-resolution radio observations of Seyfert galaxies in the extended 12-μm sample – II. The properties of compact radio components     

Andy Thean  Alan Pedlar  Marek J. Kukula  Stefi A. Baum  Christopher P. O'Dea 《Monthly notices of the Royal Astronomical Society》2001,325(2):737-760

We discuss the properties of compact nuclear radio components in Seyfert galaxies from the extended 12-μm AGN sample of Rush et al. Our main results can be summarized as follows.
Type 1 and type 2 Seyferts produce compact radio components which are indistinguishable in strength and aspect, indicating that their central engines are alike, as proposed by the unification model. Infrared IRAS fluxes are more closely correlated with low-resolution radio fluxes than high-resolution radio fluxes, suggesting that they are dominated by kiloparsec-scale, extranuclear emission regions; extranuclear emission may be stronger in type 2 Seyferts. Early-type Seyfert galaxies tend to have stronger nuclear radio emission than late-type Seyfert galaxies. V-shaped extended emission-line regions, indicative of 'ionization cones', are usually found in sources with large, collimated radio outflows. Hidden broad lines are most likely to be found in sources with powerful nuclear radio sources. Type 1 and type 2 Seyferts selected by their IRAS 12-μm flux densities have well-matched properties.  相似文献