- Bayesian inference of stellar parameters and interstellar extinction using parallaxes and multiband photometry
- Bailer-Jones, C. A. L.
Astrometric surveys provide the opportunity to measure the absolute magnitudes of large numbers of stars, but only if the individual line-of-sight extinctions are known. Unfortunately, extinction is highly degenerate with stellar effective temperatu …
- Parametrizing arbitrary galaxy morphologies: potentials and pitfalls
- Andrae, René; Jahnke, Knud; Melchior, Peter
Given the enormous galaxy data bases of modern sky surveys, parametrizing galaxy morphologies is a very challenging task due to the huge number and variety of objects. We assess the different problems faced by existing parametrization schemes (CAS, …
- The study of Type Ia supernovae spectral diversity using principal component analysis
- Cormier, Diane; Davis, Tamara M.
In order to use supernovae (SNe) as cosmological probes, a good understanding of their properties and diversity is necessary. Here we investigate whether principal component analysis (PCA) can be used to improve the calibration of Type Ia SNe. We ap …
- Path integral marginalization for cosmology: scale-dependent galaxy bias and intrinsic alignments
- Kitching, T. D.; Taylor, A. N.
We present a path integral likelihood formalism that extends parametrized likelihood analyses to include continuous functions. The method finds the maximum-likelihood point in function-space, and marginalizes over all possible functions, under the a …
- Galaxy Zoo Morphology and Photometric Redshifts in the Sloan Digital Sky Survey
- Way, M. J.
It has recently been demonstrated that one can accurately derive galaxy morphology from particular primary and secondary isophotal shape estimates in the Sloan Digital Sky Survey (SDSS) imaging catalog. This was accomplished by applying Machine Lear …
- The possibility of determining open-cluster parameters from BVRI photometry
- Monteiro, H.; Dias, W. S.
In the last decades we witnessed an increase in studies of open clusters of the Galaxy, especially because of the good determination for a wide range of values of parameters such as age, distance, reddening, and proper motion. The reliable determina …
- Applications of Bayesian model averaging to the curvature and size of the Universe
- Vardanyan, Mihran; Trotta, Roberto; Silk, Joseph
Bayesian model averaging is a procedure to obtain parameter constraints that account for the uncertainty about the correct cosmological model. We use recent cosmological observations and Bayesian model averaging to derive tight limits on the curvatu …
- Minimally parametric power spectrum reconstruction from the Lyman α forest
- Bird, Simeon; Peiris, Hiranya V.; Viel, Matteo; Verde, Licia
Current results from the Lyman α forest assume that the primordial power spectrum of density perturbations follows a simple power-law form. We present the first analysis of Lyman α data to study the effect of relaxing this strong assumption on pri …
- A redshift-distortion-free correlation function at third order in the non-linear regime
- Meng, Kelai; Pan, Jun; Szapudi, István; Feng, Longlong
The zeroth-order component of the cosine expansion of the projected three-point correlation function is proposed for the clustering analysis of cosmic large-scale structure. These functions are third-order statistics but can be measured similarly to …
- Searching for transits in data with long time baselines and poor sampling
- Tingley, B.
Aims: The standard method of searching parameter space for transits is ill-suited to data sets with long time baselines and poor temporal coverage, such as that anticipated from Gaia. In this paper, we present an alternative method for identifying t …
- Hurst parameter analysis of radio pulsar timing residuals
- Na, X. S.; Wang, N.; Yuan, J. P.; Liu, Z. Y.; Esamdin, A.; Pan, J.; Xu, R. X.
We analyse the timing residuals for 50 pulsars observed using the Nanshan 25-m radio telescope at Urumqi Observatory by determining the Hurst parameter for each data set using the rescaled range method. These pulsars have been observed over a time s …
- A Bayesian approach to star-galaxy classification
- Henrion, Marc; Mortlock, Daniel J.; Hand, David J.; Gandy, Axel
Star-galaxy classification is one of the most fundamental data-processing tasks in survey astronomy and a critical starting point for the scientific exploitation of survey data. Star-galaxy classification for bright sources can be done with almost c …
- New optimized estimators for the primordial trispectrum
- Munshi, Dipak; Heavens, Alan; Cooray, Asantha; Smidt, Joseph; Coles, Peter; Serra, Paolo
Cosmic microwave background studies of non-Gaussianity involving higher order multispectra can distinguish between early universe theories that predict nearly identical power spectra. However, the recovery of higher order multispectra is difficult f …
- Rejuvenating Power Spectra. II. The Gaussianized Galaxy Density Field
- Neyrinck, Mark C.; Szapudi, István; Szalay, Alexander S.
We find that, even in the presence of discreteness noise, a Gaussianizing transform (producing a more Gaussian one-point distribution) reduces nonlinearities in the power spectra of cosmological matter and galaxy density fields, in many cases drasti …
- Source Detection in Interferometric Visibility Data. I. Fundamental Estimation Limits
- Trott, Cathryn M.; Wayth, Randall B.; Macquart, Jean-Pierre R.; Tingay, Steven J.
Transient radio signals of astrophysical origin present an avenue for studying the dynamic universe. With the next generation of radio interferometers being planned and built, there is great potential for detecting and studying large samples of radi …
- Bayesian re-analysis of the radial velocities of Gliese 581. Evidence in favour of only four planetary companions
- Tuomi, M.
Aims: The Gliese 581 planetary system has received attention because it has been proposed to host a low-mass planet in its habitable zone. We re-analyse the radial velocity measurements reported to contain six planetary signals to see whether these …
- Statistical techniques for the detection and analysis of solar explosive events
- Sarro, L. M.; Berihuete, A.
Context. Solar explosive events are commonly explained as small-scale magnetic reconnection events, although an unambiguous confirmation of this scenario remains elusive owing to the lack of spatial resolution and the statistical analysis of suffici …
- Higher order statistics of weak lensing shear and flexion
- Munshi, Dipak; Smidt, Joseph; Heavens, Alan; Coles, Peter; Cooray, Asantha
Owing to their more extensive sky coverage and tighter control on systematic errors, future deep weak lensing surveys should provide a better statistical picture of the dark matter clustering beyond the level of the power spectrum. In this context, …
- Higher-order convergence statistics for three-dimensional weak gravitational lensing
- Munshi, Dipak; Heavens, Alan; Coles, Peter
Weak gravitational lensing on a cosmological scale can provide strong constraints on both the nature of dark matter and the dark energy equation of state. Most of the current weak lensing studies are restricted to (two-dimensional) projections, but …
- Statistical Properties of Supercluster-like Filaments from Cosmological Simulations
- Yan, Heling; Fan, Zuhui
In this paper, we study large-scale structures from numerical simulations, paying particular attention to supercluster-like structures. A grid-density-contour-based algorithm is adopted to locate connected groups. With the increase of the linking de …