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Environmental dependence of polycyclic aromatic hydrocarbon emission at z ~ 0.8. Investigation by observing RX J0152.7-1357 with AKARI
Koyama, Yusei; Kodama, Tadayuki; Matsuhara, Hideo +2 more
We study the environmental dependence of the strength of polycyclic aromatic hydrocarbon (PAH) emission using AKARI observations of RX J0152.7-1357, a galaxy cluster at z = 0.84. PAH emission reflects the physical conditions of galaxies and dominates 8 µm luminosity (L8), which can be directly measured with the L15 band of AKARI. The ratio o…
Determining the nature of faint X-ray sources from the ASCA Galactic center survey
Bikmaev, I. F.; Tsygankov, S. S.; Lutovinov, A. A. +6 more
We present the results of the the identification of six objects from the ASCA Galactic center and Galactic plane surveys: AX J173548-3207, AX J173628-3141, AX J1739.5-2910, AX J1740.4-2856, AX J1740.5-2937, and AX J1743.9-2846. Chandra, XMM-Newton, and XRT/Swift X-ray data have been used to improve the positions of the optical counterparts to thes…
Gamma rays from a supernova of type Ia: SN2014J
Diehl, R.
SN2014J is the closest supernova of type Ia that occurred in the last 40 years. This provides an opportunity for unprecedented observational detail and coverage in many astronomical bands, which will help to better understand the still unknown astrophysics of these supernovae. For the first time, such an event occurs sufficiently nearby so that al…
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 …