1,177 research outputs found
Comparison between the Blue and the Red Galaxy Alignments Detected in the Sloan Digital Sky Survey
We measure the intrinsic alignments of the blue and the red galaxies
separately by analyzing the spectroscopic data of the Sloan Digital Sky Survey
Data Release 6 (SDSS DR6). For both samples of the red and the blue galaxies
with axial ratios of b/a <= 0.8, we detect a 3 sigma signal of the ellipticity
correlation in the redshift range of 0 <= z <= 0.4 for r-band absolute (model)
magnitude cut of M_r <= -19.2 (no K correction). We note a difference in the
strength and the distance scale for the red and the blue galaxy correlation
eta_{2D}(r): For the bright blue galaxies, it behaves as a quadratic scaling of
the linear density correlation of xi(r) as eta_{2D}(r) proportional to
xi^{2}(r) with strong signal detected only at small distance bin of r <= 3
Mpc/h. While for the bright red galaxies it follows a linear scaling as
eta_{2D}(r) proportional to xi(r) with signals detected at larger distance out
to r~6 Mpc/h. We also test whether the detected correlation signal is intrinsic
or spurious by quantifying the systematic error and find that the effect of the
systematic error on the ellipticity correlation is negligible. It is finally
concluded that our results will be useful for the weak lensing measurements as
well as the understanding of the large scale structure formation.Comment: accepted by ApJL, revised version, 12 pages, 2 figures, 1 table,
systematic error analyzed and beaten down, cross-correlations between the
blue and red galaxies shown, clearer discussion on the different generation
mechanism for the blue and red galaxy alignments adde
Cosmic Shear from Galaxy Spins
We discuss the origin of galactic angular momentum, and the statistics of the
present day spin distribution. It is expected that the galaxy spin axes are
correlated with the intermediate principal axis of the gravitational shear
tensor. This allows one to reconstruct the shear field and thereby the full
gravitational potential from the observed galaxy spin fields. We use the
direction of the angular momentum vector without any information of its
magnitude, which requires a measurement of the position angle and inclination
on the sky of each disk galaxy. We present the maximum likelihood shear
inversion procedure, which involves a constrained linear minimization. The
theory is tested against numerical simulations. We find the correlation
strength of nonlinear structures with the initial shear field, and show that
accurate large scale density reconstructions are possible at the expected noise
level.Comment: Accepted by the ApJL, revised discussion, minor changes, LaTex file,
8 pages, 1 ps figur
The Nonlinear Evolution of Galaxy Intrinsic Alignments
The non-Gaussian contribution to the intrinsic halo spin alignments is
analytically modeled and numerically detected. Assuming that the growth of
non-Gaussianity in the density fluctuations caused the tidal field to have
nonlinear-order effect on the orientations of the halo angular momentum, we
model the intrinsic halo spin alignments as a linear scaling of the density
correlations on large scales, which is different from the previous
quadratic-scaling model based on the linear tidal torque theory. Then, we
analyze the halo catalogs from the recent high-resolution Millennium Run
simulation at four different redshifts (z=0,0.5,1 and 2) and measure
quantitatively the degree of the nonlinear effect on the halo spin alignments
and its changes with redshifts. A clear signal of spin correlations is found on
scales as large as 10 Mpc/h at z=0, which marks a detection of the nonlinear
tidal effect on the intrinsic halo alignments. We also investigate how the
nonlinear effect depends on the intrinsic properties of the halos. It is found
that the degree of the nonlinear tidal effect increases as the halo mass scale
decreases, the halo specific angular momentum increases, and the halo peculiar
velocity decreases. We discuss implication of our result on the weak
gravitational lensing.Comment: ApJ in press, revised version, mistakes and typos corrected,
discussion improved, 29 pages, 11 figure
Quantifying the Cosmic Web I: The large-scale halo ellipticity-ellipticity and ellipticity-direction correlations
The formation of dark matter halos tends to occur anisotropically along the
filaments of the Cosmic Web, which induces both ellipticity-ellipticity (EE)
correlations between the shapes of halos, as well as ellipticity-direction (ED)
cross-correlations between halo shapes and the directions to neighboring halos.
We analyze the halo catalogue and the semi-analytic galaxy catalogue of the
recent Millennium Run Simulation to measure the EE and ED correlations
numerically at four different redshifts (z=0, 0.5, 1 and 2). For the EE
correlations, we find that (i) the major-axis correlation is strongest while
the intermediate-axis correlation is weakest; (ii) the signal is significant at
distances out to 10 Mpc/h; (iii) the signal decreases as z decreases; (iv) and
its behavior depends strongly on the halo mass scale, with larger masses
showing stronger correlations at large distances. For the ED correlations, we
find that (i) the correlations are much stronger than the EE correlations, and
are significant even out to distances of 50 Mpc/h; (ii) the signal also
decreases as z decreases; (iii) and it increases with halo mass at all
distances. We also provide empirical fitting functions for the EE and ED
correlations. The EE correlations are found to scale linearly with the linear
density correlation function, xi(r). While the ED cross-correlation is found to
scale as xi^{1/2}(r) at large distances beyond 10 Mpc/h. The best-fit values of
the fitting parameters for the EE and the ED correlations are all determined
through chi^{2}-statistics. Our results may be useful for quantifying the
filamentary distribution of dark matter halos over a wide range of scales.Comment: MNRAS in press, final version, fitting models refined, cosmic
variance errors included, full covariance matrix computed for the error
analysis, tables for the EE and ED correlations at z=0 added, 10 pages, 10
figure
Increasing the Fisher Information Content in the Matter Power Spectrum by Non-linear Wavelet Weiner Filtering
We develop a purely mathematical tool to recover some of the information lost
in the non-linear collapse of large-scale structure. From a set of 141
simulations of dark matter density fields, we construct a non-linear Weiner
filter in order to separate Gaussian and non-Gaussian structure in wavelet
space. We find that the non-Gaussian power is dominant at smaller scales, as
expected from the theory of structure formation, while the Gaussian counterpart
is damped by an order of magnitude on small scales. We find that it is possible
to increase the Fisher information by a factor of three before reaching the
translinear plateau, an effect comparable to other techniques like the linear
reconstruction of the density field.Comment: 7 pages, 6 figures. Accepted for publication in The Astrophysical
Journa
Tentative Detection of Galaxy Spin Correlations in the Tully Catalogue
We report a tentative detection of spin correlations in the Tully catalogue
of nearby galaxies. We define a simple but nontrivial spin correlation
function, and find an analytic estimate of it in the frame of the linear
perturbation theory. Then, we present the observed spin correlation signal from
the Tully galaxies with error bars. The three dimensional spin correlation
turns out to be significant at the 97% confidence level, detected out to a few
Mpc. This observed correlation is consistent with the theoretical
prediction based on the gravitational instability picture of galaxy formation.
An analysis of systematic errors is also presented. The observed strength of
correlation may be sufficient to significantly affect blank field of weak
lensing searches.Comment: Accepted by the ApJ Letters, revised Physical Analysis, LaTex file,
10 pages, 1 ps figur
Information Content in the Galaxy Angular Power Spectrum from the Sloan Digital Sky Survey and Its Implication on Weak Lensing Analysis
We analyze the photometric redshift catalog of the Sloan Digital Sky Survey
Data Release 5 (SDSS DR5) to estimate the Fisher information in the galaxy
angular power spectrum with the help of the Rimes-Hamilton technique. It is
found that the amount of Fisher information contained in the galaxy angular
power spectrum is saturated at lensing multipole scale 300<= l <= 2000 in the
redshift range 0.1<= photo-z <0.5. At l=2000, the observed information is two
orders of magnitude lower than the case of Gaussian fluctuations. This supports
observationally that the translinear regime of the density power spectrum
contains little independent information about the initial cosmological
conditions, which is consistent with the numerical trend shown by
Rimes-Hamilton. Our results also suggest that the Gaussian-noise description
may not be valid in weak lensing measurements.Comment: ApJL in press, revised version, discussion improved, 4 pages, 3
figure
White Blood Cell Count and the Risk of Colon Cancer
Inflammation may be linked to the pathogenesis of colorectal cancer. However, two conflicting observational results were recently reported on the relationship between the inflammatory marker C-reactive protein (CRP) and the risk of colorectal cancer. Few epidemiologic studies have examined the association between inflammatory markers and the risk of colorectal cancer. We prospectively examined the mortality and incidence risk for colon and rectal cancers among 424,419 Koreans (108,907 men and 315,512 women). The subjects were 40 to 95 years of age and from the Korean Cancer Prevention Study (KCPS) cohort. All subjects received medical examination from the National Health Insurance Corporation in 1993 and 1995. The maximum follow-up period was 10 years, and the follow-up periods began in January 1, 1994 and ended in December 31, 2003. An elevated white blood cell count (WBC) was associated with a higher mortality risk of colon cancer (highest versus lowest quartile: men, 1.55, 95% CI 1.10-2.18, p for trend = 0.0014; women, 1.51, 95% CI 1.12-2.03, p for trend = 0.0049). Similarly, an elevated WBC was associated with a higher incidence risk of colon cancer (highest versus lowest quartile: men, 1.38, 1.09-1.76, p for trend = 0.0017; women, 1.46, 95% CI 1.20-1.78, p for trend = 0.0003). A positive linear trend was also observed in non-smokers. There was no significant association between WBC and the risk of rectal cancer. Our findings demonstrate that an elevated WBC is associated with an increase in both the mortality and incidence rates of colon cancer. These results support our hypothesis that inflammation increases the risk of colon cancer
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