- Intrinsic size correlations in weak lensing
- Ciarlariello, Sandro; Crittenden, Robert; Pace, Francesco
We present a simple model for describing intrinsic correlations for galaxy sizes based on the halo model. Studying these correlations is important both to improve our understanding of galaxy properties and because they are a potential systematic for …
- Galaxy Cluster Mass Reconstruction Project – II. Quantifying scatter and bias using contrasting mock catalogues
- Old, L.; Wojtak, R.; Mamon, G. A.; Skibba, R. A.; Pearce, F. R.; Croton, D.; Bamford, S.; Behroozi, P.; de Carvalho, R.; Muñoz-Cuartas, J. C.; Gifford, D.; Gray, M. E.; der Linden, A. von; Merrifield, M. R.; Muldrew, S. I.; Müller, V.; Pearson, R. J.; Ponman, T. J.; Rozo, E.; Rykoff, E.; Saro, A.; Sepp, T.; Sifón, C.; Tempel, E.
This paper is the second in a series in which we perform an extensive comparison of various galaxy-based cluster mass estimation techniques that utilize the positions, velocities and colours of galaxies. Our aim is to quantify the scatter, systemati …
- Detection and localization of single-source gravitational waves with pulsar timing arrays
- Zhu, X.-J.; Wen, L.; Hobbs, G.; Zhang, Y.; Wang, Y.; Madison, D. R.; Manchester, R. N.; Kerr, M.; Rosado, P. A.; Wang, J.-B.
Pulsar timing arrays (PTAs) can be used to search for very low frequency (10-9-10-7 Hz) gravitational waves (GWs). In this paper, we present a general method for the detection and localization of single-source GWs using PTAs. We demonstrate the effe …
- CFHTLenS: a Gaussian likelihood is a sufficient approximation for a cosmological analysis of third-order cosmic shear statistics
- Simon, P.; Semboloni, E.; van Waerbeke, L.; Hoekstra, H.; Erben, T.; Fu, L.; Harnois-Déraps, J.; Heymans, C.; Hildebrandt, H.; Kilbinger, M.; Kitching, T. D.; Miller, L.; Schrabback, T.
We study the correlations of the shear signal between triplets of sources in the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) to probe cosmological parameters via the matter bispectrum. In contrast to previous studies, we adopt a non-Gau …
- A large sample of metallic-line star candidates from LAMOST Data Release 1
- Hou, Wen; Luo, Ali; Yang, Haifeng; Wei, Peng; Zhao, Yongheng; Zuo, Fang; Song, Yihan; Du, Bing; Bai, Zhongrui; Zhang, Yong; Hou, Yonghui; Liu, Xiaowei
We present a sample of metallic-line star (Am) candidates from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) Data Release One (DR1). According to the characteristic of underabundance of calcium and overabundance of iron elem …
- The analysis of indexed astronomical time series – XI. The statistics of oversampled white noise periodograms
- Koen, Chris
The distribution of the maxima of periodograms is considered in the case where the time series is made up of regularly sampled, uncorrelated Gaussians. It is pointed out that if there is no oversampling, then for large data sets, the known distribut …
- Machine learning for transient discovery in Pan-STARRS1 difference imaging
- Wright, D. E.; Smartt, S. J.; Smith, K. W.; Miller, P.; Kotak, R.; Rest, A.; Burgett, W. S.; Chambers, K. C.; Flewelling, H.; Hodapp, K. W.; Huber, M.; Jedicke, R.; Kaiser, N.; Metcalfe, N.; Price, P. A.; Tonry, J. L.; Wainscoat, R. J.; Waters, C.
Efficient identification and follow-up of astronomical transients is hindered by the need for humans to manually select promising candidates from data streams that contain many false positives. These artefacts arise in the difference images that are …
- Linearly Supporting Feature Extraction for Automated Estimation of Stellar Atmospheric Parameters
- Li, Xiangru; Lu, Yu; Comte, Georges; Luo, Ali; Zhao, Yongheng; Wang, Yongjun
We describe a scheme to extract linearly supporting (LSU) features from stellar spectra to automatically estimate the atmospheric parameters {{T}{\tt{eff} }}, log g, and [Fe/H]. “Linearly supporting” means that the atmospheric parameters can be …
- Three-point Phase Correlations: A New Measure of Non-linear Large-scale Structure
- Wolstenhulme, Richard; Bonvin, Camille; Obreschkow, Danail
We derive an analytical expression for a novel large-scale structure observable: the line correlation function. The line correlation function, which is constructed from the three-point correlation function of the phase of the density field, is a rob …
- Feasibility of Heliospheric Imaging from Near Earth
- DeForest, C. E.; Howard, T. A.
Imaging solar wind structures via Thomson scattered sunlight has proved important to understanding the inner heliosphere. The principal challenge of heliospheric imaging is background subtraction: typical solar wind features are fainter than the zod …
- Bimodal Structure of the Solar Cycle
- Du, Z. L.
Some properties of the 11 yr solar cycle can be explained by the current solar dynamo models. However, some other features remain not well understood such as the asymmetry of the cycle, the double-peaked structure, and the “Waldmeier effect” tha …
- Sparse inversion of Stokes profiles. I. Two-dimensional Milne-Eddington inversions
- Asensio Ramos, A.; de la Cruz Rodríguez, J.
Context. Inversion codes are numerical tools used to infer physical properties from observations. Despite their success, the quality of current spectropolarimetric observations and those expected in the near future presents a challenge to current in …
- Estimating the magnetic field strength from magnetograms
- Asensio Ramos, A.; Martínez González, M. J.; Manso Sainz, R.
A properly calibrated longitudinal magnetograph is an instrument that measures circular polarization and gives an estimation of the magnetic flux density in each observed resolution element. This usually constitutes a lower bound of the field streng …
- Difference image analysis: The interplay between the photometric scale factor and systematic photometric errors
- Bramich, D. M.; Bachelet, E.; Alsubai, K. A.; Mislis, D.; Parley, N.
Context. Understanding the source of systematic errors in photometry is essential for their calibration. Aims: We investigate how photometry performed on difference images can be influenced by errors in the photometric scale factor. Methods: We …
- Hopfield neural network deconvolution for weak lensing measurement
- Nurbaeva, G.; Tewes, M.; Courbin, F.; Meylan, G.
Weak gravitational lensing has the potential to place tight constraints on the equation of the state of dark energy. However, this will only be possible if shear measurement methods can reach the required level of accuracy. We present a new method f …
- Periodicity in some light curves of the solar analogue V352 Canis Majoris
- Kajatkari, P.; Jetsu, L.; Cole, E.; Hackman, T.; Henry, G. W.; Joutsiniemi, S.-L.; Lehtinen, J.; Mäkelä, V.; Porceddu, S.; Ryynänen, K.; Solea, V.
Aims: We applied the Continuous Period Search (CPS) method to 14 yr of V-band photometry of the active G6.5 solar analog V352 CMa. Our aim was to show that CPS can successfully model the presence or absence of periodicity in low-amplitude light curv …
- ARES v2: new features and improved performance
- Sousa, S. G.; Santos, N. C.; Adibekyan, V.; Delgado-Mena, E.; Israelian, G.
Aims: We present a new upgraded version of ARES. The new version includes a series of interesting new features such as automatic radial velocity correction, a fully automatic continuum determination, and an estimation of the errors for the equivalen …
- Reanalyzing the visible colors of Centaurs and KBOs: what is there and what we might be missing
- Peixinho, Nuno; Delsanti, Audrey; Doressoundiram, Alain
Since the discovery of the Kuiper belt, broadband surface colors were thoroughly studied as a first approximation to the object reflectivity spectra. Visible colors (BVRI) have proven to be a reasonable proxy for real spectra, which are rather linea …
- Doppler tomography by total variation minimization
- Uemura, Makoto; Kato, Taichi; Nogami, Daisaku; Mennickent, Ronald
We have developed a new model of Doppler tomography using total variation minimization (DTTVM). This method can reconstruct localized and nonaxisymmetric profiles with sharp edges in the Doppler map. This characteristic is emphasized in the case whe …
- Exploring three faint source detections methods for aperture synthesis radio images
- Peracaula, M.; Torrent, A.; Masias, M.; Lladó, X.; Freixenet, J.; Martí, J.; Sánchez-Sutil, J. R.; Muñoz-Arjonilla, A. J.; Paredes, J. M.
Wide-field radio interferometric images often contain a large population of faint compact sources. Due to their low intensity/noise ratio, these objects can be easily missed by automated detection methods, which have been classically based on thresh …