Search Publications
Improved cosmological model fitting of Planck data with a dark energy spike
Park, Chan-Gyung
The Λ cold dark matter (Λ CDM ) model is currently known as the simplest cosmology model that best describes observations with a minimal number of parameters. Here we introduce a cosmology model that is preferred over the conventional Λ CDM one by constructing dark energy as the sum of the cosmological constant Λ and an additional fluid that is de…
Statistical analysis of the magnetic fluctuations in boundary layers of Earth's magnetosphere
Savin, S. P.; Kozak, L. V.; Prokhorenkov, A. S.
Investigation of statistical features of the magnetic fluctuations in boundary layers of Earth's magnetosphere and plasma of the solar wind, on different time scales, is carried out using magnetic field measurements from Cluster-II with a sampling frequency of 22.5 Hz in 2007-2010. We have studied the changes of shape and parameters of probability…
Reprint of: Multiwavelength modeling the SED of supersoft X-ray sources III. RS Ophiuchi: The supersoft X-ray phase and beyond
Skopal, A.
I modeled the 14 Å-37 µ m SED of the recurrent symbiotic nova RS Oph during its supersoft source (SSS) phase and the following quiescent phase. During the SSS phase, the model SEDs revealed the presence of a strong stellar and nebular component of radiation in the spectrum. The former was emitted by the burning WD at highly super-Eddington r…
Nonparametric test of consistency between cosmological models and multiband CMB measurements
Shafieloo, Arman; Aghamousa, Amir
We present a novel approach to test the consistency of the cosmological models with multiband CMB data using a nonparametric approach. In our analysis we calibrate the REACT (Risk Estimation and Adaptation after Coordinate Transformation) confidence levels associated with distances in function space (confidence distances) based on the Monte Carlo …
Learn-as-you-go acceleration of cosmological parameter estimates
Aslanyan, Grigor; Easther, Richard; Price, Layne C.
Cosmological analyses can be accelerated by approximating slow calculations using a training set, which is either precomputed or generated dynamically. However, this approach is only safe if the approximations are well understood and controlled. This paper surveys issues associated with the use of machine-learning based emulation strategies for ac…
Circular Polarization Characteristics of South Polar Lunar Craters using Chandrayaan-1 Mini-SAR and LRO Mini-RF
Calla, Om Prakash Narayan; Mathur, Shubhra; Jangid, Monika +1 more
The paper presents a case study of inconsistent behaviour of Chandrayaan-1 Mini-SAR and LRO Mini-RF data over south polar lunar craters. The paper includes analysis of Stokes parameters and characterization of received time-varying electromagnetic fields over the south pole lunar craters. For the study, Chandrayaan-1 Mini-SAR and LRO Mini-RF data …
A Deep Herschel/PACS Observation of CO(40-39) in NGC 1068: A Search for the Molecular Torus
Lutz, D.; Genzel, R.; Poglitsch, A. +14 more
Emission from high-J CO lines in galaxies has long been proposed as a tracer of X-ray dominated regions (XDRs) produced by active galactic nuclei (AGNs). Of particular interest is the question of whether the obscuring torus, which is required by AGN unification models, can be observed via high-J CO cooling lines. Here we report on the analysis of …
Morphology and structure of extremely red objects at z ∼ 1 in the CANDELS-COSMOS field
Kong, Xu; Chen, Yang; Fang, Guan-Wen +1 more
Using high-resolution HST/Wide Field Camera 3 F125W imaging from the CANDELS-COSMOS field, we report the structural and morphological properties of extremely red objects (EROs) at z ∼ 1. Based on the UVJ color criteria, we separate EROs into two types: old passive galaxies (OGs) and dusty star-forming galaxies (DGs). For a given stellar mass, we f…
Suzaku observations of the old pulsar wind nebula candidate HESS J1356-645
Dotani, Tadayasu; Bamba, Aya; Hiraga, Junko S. +3 more
A largely extended X-ray emission was discovered around the pulsar PSR J1357-6429 with the Suzaku deep observations. The pulsar, whose characteristic age is 7.3 kyr, is located within the TeV γ-ray source HESS J1356-645. The extended emission is found to have a 1 σ X-ray size of ∼ 4', or ∼ 3 pc at 2.4 kpc, with a small offset from the pulsar. Its …
Magnetopause orientation: Comparison between generic residue analysis and BV method
Dorville, Nicolas; Belmont, Gérard; Rezeau, Laurence +2 more
Determining the direction normal to the magnetopause layer is a key step for any study of this boundary. Various techniques have been developed for this purpose. We focus here on generic residue analysis (GRA) methods, which are based on conservation laws, and the new iterative BV method, where B represents the magnetic field and V refers to the i…